binder


 /* drivers/misc/binder.c
  *
  * Android IPC Subsystem
  *
  * Copyright (C) 2007-2008 Google, Inc.
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  */
 
 #include
 #include
 #include
 #include
 #include
 #include
 #include
 #include
 #include
 #include
 #include
 #include
 #include
 #include
 #include
 #include
 #include
 
 static DEFINE_MUTEX(binder_lock);
 static HLIST_HEAD(binder_procs);
 static struct binder_node *binder_context_mgr_node;
 static uid_t binder_context_mgr_uid = -1;
 static int binder_last_id;
 static struct proc_dir_entry *binder_proc_dir_entry_root;
 static struct proc_dir_entry *binder_proc_dir_entry_proc;
 static struct hlist_head binder_dead_nodes;
 
 static int binder_read_proc_proc(
         char *page, char **start, off_t off, int count, int *eof, void *data);
 
 /* This is only defined in include/asm-arm/sizes.h */
 #ifndef SZ_1K
 #define SZ_1K                               0x400
 #endif
 
 #ifndef SZ_4M
 #define SZ_4M                               0x400000
 #endif
 
 #ifndef __i386__
 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE | VM_EXEC)
 #else
 #define FORBIDDEN_MMAP_FLAGS                (VM_WRITE)
 #endif
 
 #define BINDER_SMALL_BUF_SIZE (PAGE_SIZE * 64)
 
 enum {
         BINDER_DEBUG_USER_ERROR             = 1U << 0,
         BINDER_DEBUG_FAILED_TRANSACTION     = 1U << 1,
         BINDER_DEBUG_DEAD_TRANSACTION       = 1U << 2,
         BINDER_DEBUG_OPEN_CLOSE             = 1U << 3,
         BINDER_DEBUG_DEAD_BINDER            = 1U << 4,
         BINDER_DEBUG_DEATH_NOTIFICATION     = 1U << 5,
         BINDER_DEBUG_READ_WRITE             = 1U << 6,
         BINDER_DEBUG_USER_REFS              = 1U << 7,
         BINDER_DEBUG_THREADS                = 1U << 8,
         BINDER_DEBUG_TRANSACTION            = 1U << 9,
         BINDER_DEBUG_TRANSACTION_COMPLETE   = 1U << 10,
         BINDER_DEBUG_FREE_BUFFER            = 1U << 11,
         BINDER_DEBUG_INTERNAL_REFS          = 1U << 12,
         BINDER_DEBUG_BUFFER_ALLOC           = 1U << 13,
         BINDER_DEBUG_PRIORITY_CAP           = 1U << 14,
         BINDER_DEBUG_BUFFER_ALLOC_ASYNC     = 1U << 15,
 };
 static uint32_t binder_debug_mask = BINDER_DEBUG_USER_ERROR |
         BINDER_DEBUG_FAILED_TRANSACTION | BINDER_DEBUG_DEAD_TRANSACTION;
 module_param_named(debug_mask, binder_debug_mask, uint, S_IWUSR | S_IRUGO)
 static int binder_debug_no_lock;
 module_param_named(proc_no_lock, binder_debug_no_lock, bool, S_IWUSR | S_IRUGO)
 static DECLARE_WAIT_QUEUE_HEAD(binder_user_error_wait);
 static int binder_stop_on_user_error;
 static int binder_set_stop_on_user_error(
         const char *val, struct kernel_param *kp)
 {
         int ret;
         ret = param_set_int(val, kp);
         if (binder_stop_on_user_error < 2)
                 wake_up(&binder_user_error_wait);
         return ret;
 }
 module_param_call(stop_on_user_error, binder_set_stop_on_user_error,
         param_get_int, &binder_stop_on_user_error, S_IWUSR | S_IRUGO);
 
 #define binder_user_error(x...) /
         do { /
                 if (binder_debug_mask & BINDER_DEBUG_USER_ERROR) /
                         printk(KERN_INFO x); /
                 if (binder_stop_on_user_error) /
                         binder_stop_on_user_error = 2; /
         } while (0)
 
 enum {
         BINDER_STAT_PROC,
         BINDER_STAT_THREAD,
         BINDER_STAT_NODE,
         BINDER_STAT_REF,
         BINDER_STAT_DEATH,
         BINDER_STAT_TRANSACTION,
         BINDER_STAT_TRANSACTION_COMPLETE,
         BINDER_STAT_COUNT
 };
 
 struct binder_stats {
         int br[_IOC_NR(BR_FAILED_REPLY) + 1];
         int bc[_IOC_NR(BC_DEAD_BINDER_DONE) + 1];
         int obj_created[BINDER_STAT_COUNT];
         int obj_deleted[BINDER_STAT_COUNT];
 };
 
 static struct binder_stats binder_stats;
 
 struct binder_transaction_log_entry {
         int debug_id;
         int call_type;
         int from_proc;
         int from_thread;
         int target_handle;
         int to_proc;
         int to_thread;
         int to_node;
         int data_size;
         int offsets_size;
 };
 struct binder_transaction_log {
         int next;
         int full;
         struct binder_transaction_log_entry entry[32];
 };
 struct binder_transaction_log binder_transaction_log;
 struct binder_transaction_log binder_transaction_log_failed;
 
 static struct binder_transaction_log_entry *binder_transaction_log_add(
         struct binder_transaction_log *log)
 {
         struct binder_transaction_log_entry *e;
         e = &log->entry[log->next];
         memset(e, 0, sizeof(*e));
         log->next++;
         if (log->next == ARRAY_SIZE(log->entry)) {
                 log->next = 0;
                 log->full = 1;
         }
         return e;
 }
 
 struct binder_work {
         struct list_head entry;
         enum {
                 BINDER_WORK_TRANSACTION = 1,
                 BINDER_WORK_TRANSACTION_COMPLETE,
                 BINDER_WORK_NODE,
                 BINDER_WORK_DEAD_BINDER,
                 BINDER_WORK_DEAD_BINDER_AND_CLEAR,
                 BINDER_WORK_CLEAR_DEATH_NOTIFICATION,
         } type;
 };
 
 struct binder_node {
         int debug_id;
         struct binder_work work;
         union {
                 struct rb_node rb_node;
                 struct hlist_node dead_node;
         };
         struct binder_proc *proc;
         struct hlist_head refs;
         int internal_strong_refs;
         int local_weak_refs;
         int local_strong_refs;
         void __user *ptr;
         void __user *cookie;
         unsigned has_strong_ref : 1;
         unsigned pending_strong_ref : 1;
         unsigned has_weak_ref : 1;
         unsigned pending_weak_ref : 1;
         unsigned has_async_transaction : 1;
         unsigned accept_fds : 1;
         int min_priority : 8;
         struct list_head async_todo;
 };
 
 struct binder_ref_death {
         struct binder_work work;
         void __user *cookie;
 };
 
 struct binder_ref {
         /* Lookups needed: */
         /*   node + proc => ref (transaction) */
         /*   desc + proc => ref (transaction, inc/dec ref) */
         /*   node => refs + procs (proc exit) */
         int debug_id;
         struct rb_node rb_node_desc;
         struct rb_node rb_node_node;
         struct hlist_node node_entry;
         struct binder_proc *proc;
         struct binder_node *node;
         uint32_t desc;
         int strong;
         int weak;
         struct binder_ref_death *death;
 };
 
 struct binder_buffer {
         struct list_head entry; /* free and allocated entries by addesss */
         struct rb_node rb_node; /* free entry by size or allocated entry */
                                 /* by address */
         unsigned free : 1;
         unsigned allow_user_free : 1;
         unsigned async_transaction : 1;
         unsigned debug_id : 29;
 
         struct binder_transaction *transaction;
 
         struct binder_node *target_node;
         size_t data_size;
         size_t offsets_size;
         uint8_t data[0];
 };
 
 struct binder_proc {
         struct hlist_node proc_node;
         struct rb_root threads;
         struct rb_root nodes;
         struct rb_root refs_by_desc;
         struct rb_root refs_by_node;
         int pid;
         struct vm_area_struct *vma;
         struct task_struct *tsk;
         void *buffer;
         size_t user_buffer_offset;
 
         struct list_head buffers;
         struct rb_root free_buffers;
         struct rb_root allocated_buffers;
         size_t free_async_space;
 
         struct page **pages;
         size_t buffer_size;
         uint32_t buffer_free;
         struct list_head todo;
         wait_queue_head_t wait;
         struct binder_stats stats;
         struct list_head delivered_death;
         int max_threads;
         int requested_threads;
         int requested_threads_started;
         int ready_threads;
         long default_priority;
 };
 
 enum {
         BINDER_LOOPER_STATE_REGISTERED  = 0x01,
         BINDER_LOOPER_STATE_ENTERED     = 0x02,
         BINDER_LOOPER_STATE_EXITED      = 0x04,
         BINDER_LOOPER_STATE_INVALID     = 0x08,
         BINDER_LOOPER_STATE_WAITING     = 0x10,
         BINDER_LOOPER_STATE_NEED_RETURN = 0x20
 };
 
 struct binder_thread {
         struct binder_proc *proc;
         struct rb_node rb_node;
         int pid;
         int looper;
         struct binder_transaction *transaction_stack;
         struct list_head todo;
         uint32_t return_error; /* Write failed, return error code in read buf */
         uint32_t return_error2; /* Write failed, return error code in read */
                 /* buffer. Used when sending a reply to a dead process that */
                 /* we are also waiting on */
         wait_queue_head_t wait;
         struct binder_stats stats;
 };
 
 struct binder_transaction {
         int debug_id;
         struct binder_work work;
         struct binder_thread *from;
         struct binder_transaction *from_parent;
         struct binder_proc *to_proc;
         struct binder_thread *to_thread;
         struct binder_transaction *to_parent;
         unsigned need_reply : 1;
         /*unsigned is_dead : 1;*/ /* not used at the moment */
 
         struct binder_buffer *buffer;
         unsigned int    code;
         unsigned int    flags;
         long    priority;
         long    saved_priority;
         uid_t   sender_euid;
 };
 
 /*
  * copied from get_unused_fd_flags
  */
 int task_get_unused_fd_flags(struct task_struct *tsk, int flags)
 {
         struct files_struct *files = get_files_struct(tsk);
         int fd, error;
         struct fdtable *fdt;
         unsigned long rlim_cur;
 
         if (files == NULL)
                 return -ESRCH;
 
         error = -EMFILE;
         spin_lock(&files->file_lock);
 
 repeat:
         fdt = files_fdtable(files);
         fd = find_next_zero_bit(fdt->open_fds->fds_bits, fdt->max_fds,
                                 files->next_fd);
 
         /*
          * N.B. For clone tasks sharing a files structure, this test
          * will limit the total number of files that can be opened.
          */
         rcu_read_lock();
         if (tsk->signal)
                 rlim_cur = tsk->signal->rlim[RLIMIT_NOFILE].rlim_cur;
         else
                 rlim_cur = 0;
         rcu_read_unlock();
         if (fd >= rlim_cur)
                 goto out;
 
         /* Do we need to expand the fd array or fd set?  */
         error = expand_files(files, fd);
         if (error < 0)
                 goto out;
 
         if (error) {
                 /*
                  * If we needed to expand the fs array we
                  * might have blocked - try again.
                  */
                 error = -EMFILE;
                 goto repeat;
         }
 
         FD_SET(fd, fdt->open_fds);
         if (flags & O_CLOEXEC)
                 FD_SET(fd, fdt->close_on_exec);
         else
                 FD_CLR(fd, fdt->close_on_exec);
         files->next_fd = fd + 1;
 #if 1
         /* Sanity check */
         if (fdt->fd[fd] != NULL) {
                 printk(KERN_WARNING "get_unused_fd: slot %d not NULL!/n", fd);
                 fdt->fd[fd] = NULL;
         }
 #endif
         error = fd;
 
 out:
         spin_unlock(&files->file_lock);
         put_files_struct(files);
         return error;
 }
 
 /*
  * copied from fd_install
  */
 static void task_fd_install(
         struct task_struct *tsk, unsigned int fd, struct file *file)
 {
         struct files_struct *files = get_files_struct(tsk);
         struct fdtable *fdt;
 
         if (files == NULL)
                 return;
 
         spin_lock(&files->file_lock);
         fdt = files_fdtable(files);
         BUG_ON(fdt->fd[fd] != NULL);
         rcu_assign_pointer(fdt->fd[fd], file);
         spin_unlock(&files->file_lock);
         put_files_struct(files);
 }
 
 /*
  * copied from __put_unused_fd in open.c
  */
 static void __put_unused_fd(struct files_struct *files, unsigned int fd)
 {
         struct fdtable *fdt = files_fdtable(files);
         __FD_CLR(fd, fdt->open_fds);
         if (fd < files->next_fd)
                 files->next_fd = fd;
 }
 
 /*
  * copied from sys_close
  */
 static long task_close_fd(struct task_struct *tsk, unsigned int fd)
 {
         struct file *filp;
         struct files_struct *files = get_files_struct(tsk);
         struct fdtable *fdt;
         int retval;
 
         if (files == NULL)
                 return -ESRCH;
 
         spin_lock(&files->file_lock);
         fdt = files_fdtable(files);
         if (fd >= fdt->max_fds)
                 goto out_unlock;
         filp = fdt->fd[fd];
         if (!filp)
                 goto out_unlock;
         rcu_assign_pointer(fdt->fd[fd], NULL);
         FD_CLR(fd, fdt->close_on_exec);
         __put_unused_fd(files, fd);
         spin_unlock(&files->file_lock);
         retval = filp_close(filp, files);
 
         /* can't restart close syscall because file table entry was cleared */
         if (unlikely(retval == -ERESTARTSYS ||
                      retval == -ERESTARTNOINTR ||
                      retval == -ERESTARTNOHAND ||
                      retval == -ERESTART_RESTARTBLOCK))
                 retval = -EINTR;
 
         put_files_struct(files);
         return retval;
 
 out_unlock:
         spin_unlock(&files->file_lock);
         put_files_struct(files);
         return -EBADF;
 }
 
 static void binder_set_nice(long nice)
 {
         long min_nice;
         if (can_nice(current, nice)) {
                 set_user_nice(current, nice);
                 return;
         }
         min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
         if (binder_debug_mask & BINDER_DEBUG_PRIORITY_CAP)
                 printk(KERN_INFO "binder: %d: nice value %ld not allowed use "
                        "%ld instead/n", current->pid, nice, min_nice);
         set_user_nice(current, min_nice);
         if (min_nice < 20)
                 return;
         binder_user_error("binder: %d RLIMIT_NICE not set/n", current->pid);
 }
 
 static size_t binder_buffer_size(
         struct binder_proc *proc, struct binder_buffer *buffer)
 {
         if (list_is_last(&buffer->entry, &proc->buffers))
                 return proc->buffer + proc->buffer_size - (void *)buffer->data;
         else
                 return (size_t)list_entry(buffer->entry.next,
                         struct binder_buffer, entry) - (size_t)buffer->data;
 }
 
 static void binder_insert_free_buffer(
         struct binder_proc *proc, struct binder_buffer *new_buffer)
 {
         struct rb_node **p = &proc->free_buffers.rb_node;
         struct rb_node *parent = NULL;
         struct binder_buffer *buffer;
         size_t buffer_size;
         size_t new_buffer_size;
 
         BUG_ON(!new_buffer->free);
 
         new_buffer_size = binder_buffer_size(proc, new_buffer);
 
         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                 printk(KERN_INFO "binder: %d: add free buffer, size %d, "
                        "at %p/n", proc->pid, new_buffer_size, new_buffer);
 
         while (*p) {
                 parent = *p;
                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
                 BUG_ON(!buffer->free);
 
                 buffer_size = binder_buffer_size(proc, buffer);
 
                 if (new_buffer_size < buffer_size)
                         p = &parent->rb_left;
                 else
                         p = &parent->rb_right;
         }
         rb_link_node(&new_buffer->rb_node, parent, p);
         rb_insert_color(&new_buffer->rb_node, &proc->free_buffers);
 }
 
 static void binder_insert_allocated_buffer(
         struct binder_proc *proc, struct binder_buffer *new_buffer)
 {
         struct rb_node **p = &proc->allocated_buffers.rb_node;
         struct rb_node *parent = NULL;
         struct binder_buffer *buffer;
 
         BUG_ON(new_buffer->free);
 
         while (*p) {
                 parent = *p;
                 buffer = rb_entry(parent, struct binder_buffer, rb_node);
                 BUG_ON(buffer->free);
 
                 if (new_buffer < buffer)
                         p = &parent->rb_left;
                 else if (new_buffer > buffer)
                         p = &parent->rb_right;
                 else
                         BUG();
         }
         rb_link_node(&new_buffer->rb_node, parent, p);
         rb_insert_color(&new_buffer->rb_node, &proc->allocated_buffers);
 }
 
 static struct binder_buffer *binder_buffer_lookup(
         struct binder_proc *proc, void __user *user_ptr)
 {
         struct rb_node *n = proc->allocated_buffers.rb_node;
         struct binder_buffer *buffer;
         struct binder_buffer *kern_ptr;
 
         kern_ptr = user_ptr - proc->user_buffer_offset
                 - offsetof(struct binder_buffer, data);
 
         while (n) {
                 buffer = rb_entry(n, struct binder_buffer, rb_node);
                 BUG_ON(buffer->free);
 
                 if (kern_ptr < buffer)
                         n = n->rb_left;
                 else if (kern_ptr > buffer)
                         n = n->rb_right;
                 else
                         return buffer;
         }
         return NULL;
 }
 
 static int binder_update_page_range(struct binder_proc *proc, int allocate,
         void *start, void *end, struct vm_area_struct *vma)
 {
         void *page_addr;
         unsigned long user_page_addr;
         struct vm_struct tmp_area;
         struct page **page;
         struct mm_struct *mm;
 
         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                 printk(KERN_INFO "binder: %d: %s pages %p-%p/n",
                        proc->pid, allocate ? "allocate" : "free", start, end);
 
         if (end <= start)
                 return 0;
 
         if (vma)
                 mm = NULL;
         else
                 mm = get_task_mm(proc->tsk);
 
         if (mm) {
                 down_write(&mm->mmap_sem);
                 vma = proc->vma;
         }
 
         if (allocate == 0)
                 goto free_range;
 
         if (vma == NULL) {
                 printk(KERN_ERR "binder: %d: binder_alloc_buf failed to "
                        "map pages in userspace, no vma/n", proc->pid);
                 goto err_no_vma;
         }
 
         for (page_addr = start; page_addr < end; page_addr += PAGE_SIZE) {
                 int ret;
                 struct page **page_array_ptr;
                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
 
                 BUG_ON(*page);
                 *page = alloc_page(GFP_KERNEL | __GFP_ZERO);
                 if (*page == NULL) {
                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
                                "for page at %p/n", proc->pid, page_addr);
                         goto err_alloc_page_failed;
                 }
                 tmp_area.addr = page_addr;
                 tmp_area.size = PAGE_SIZE + PAGE_SIZE /* guard page? */;
                 page_array_ptr = page;
                 ret = map_vm_area(&tmp_area, PAGE_KERNEL, &page_array_ptr);
                 if (ret) {
                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
                                "to map page at %p in kernel/n",
                                proc->pid, page_addr);
                         goto err_map_kernel_failed;
                 }
                 user_page_addr = (size_t)page_addr + proc->user_buffer_offset;
                 ret = vm_insert_page(vma, user_page_addr, page[0]);
                 if (ret) {
                         printk(KERN_ERR "binder: %d: binder_alloc_buf failed "
                                "to map page at %lx in userspace/n",
                                proc->pid, user_page_addr);
                         goto err_vm_insert_page_failed;
                 }
                 /* vm_insert_page does not seem to increment the refcount */
         }
         if (mm) {
                 up_write(&mm->mmap_sem);
                 mmput(mm);
         }
         return 0;
 
 free_range:
         for (page_addr = end - PAGE_SIZE; page_addr >= start;
              page_addr -= PAGE_SIZE) {
                 page = &proc->pages[(page_addr - proc->buffer) / PAGE_SIZE];
                 if (vma)
                         zap_page_range(vma, (size_t)page_addr +
                                 proc->user_buffer_offset, PAGE_SIZE, NULL);
 err_vm_insert_page_failed:
                 unmap_kernel_range((unsigned long)page_addr, PAGE_SIZE);
 err_map_kernel_failed:
                 __free_page(*page);
                 *page = NULL;
 err_alloc_page_failed:
                 ;
         }
 err_no_vma:
         if (mm) {
                 up_write(&mm->mmap_sem);
                 mmput(mm);
         }
         return -ENOMEM;
 }
 
 static struct binder_buffer *binder_alloc_buf(struct binder_proc *proc,
         size_t data_size, size_t offsets_size, int is_async)
 {
         struct rb_node *n = proc->free_buffers.rb_node;
         struct binder_buffer *buffer;
         size_t buffer_size;
         struct rb_node *best_fit = NULL;
         void *has_page_addr;
         void *end_page_addr;
         size_t size;
 
         if (proc->vma == NULL) {
                 printk(KERN_ERR "binder: %d: binder_alloc_buf, no vma/n",
                        proc->pid);
                 return NULL;
         }
 
         size = ALIGN(data_size, sizeof(void *)) +
                 ALIGN(offsets_size, sizeof(void *));
 
         if (size < data_size || size < offsets_size) {
                 binder_user_error("binder: %d: got transaction with invalid "
                         "size %d-%d/n", proc->pid, data_size, offsets_size);
                 return NULL;
         }
 
         if (is_async &&
             proc->free_async_space < size + sizeof(struct binder_buffer)) {
                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                         printk(KERN_ERR "binder: %d: binder_alloc_buf size %d f"
                                "ailed, no async space left/n", proc->pid, size);
                 return NULL;
         }
 
         while (n) {
                 buffer = rb_entry(n, struct binder_buffer, rb_node);
                 BUG_ON(!buffer->free);
                 buffer_size = binder_buffer_size(proc, buffer);
 
                 if (size < buffer_size) {
                         best_fit = n;
                         n = n->rb_left;
                 } else if (size > buffer_size)
                         n = n->rb_right;
                 else {
                         best_fit = n;
                         break;
                 }
         }
         if (best_fit == NULL) {
                 printk(KERN_ERR "binder: %d: binder_alloc_buf size %d failed, "
                        "no address space/n", proc->pid, size);
                 return NULL;
         }
         if (n == NULL) {
                 buffer = rb_entry(best_fit, struct binder_buffer, rb_node);
                 buffer_size = binder_buffer_size(proc, buffer);
         }
         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                 printk(KERN_INFO "binder: %d: binder_alloc_buf size %d got buff"
                        "er %p size %d/n", proc->pid, size, buffer, buffer_size);
 
         has_page_addr =
                 (void *)(((size_t)buffer->data + buffer_size) & PAGE_MASK);
         if (n == NULL) {
                 if (size + sizeof(struct binder_buffer) + 4 >= buffer_size)
                         buffer_size = size; /* no room for other buffers */
                 else
                         buffer_size = size + sizeof(struct binder_buffer);
         }
         end_page_addr = (void *)PAGE_ALIGN((size_t)buffer->data + buffer_size);
         if (end_page_addr > has_page_addr)
                 end_page_addr = has_page_addr;
         if (binder_update_page_range(proc, 1,
             (void *)PAGE_ALIGN((size_t)buffer->data), end_page_addr, NULL))
                 return NULL;
 
         rb_erase(best_fit, &proc->free_buffers);
         buffer->free = 0;
         binder_insert_allocated_buffer(proc, buffer);
         if (buffer_size != size) {
                 struct binder_buffer *new_buffer = (void *)buffer->data + size;
                 list_add(&new_buffer->entry, &buffer->entry);
                 new_buffer->free = 1;
                 binder_insert_free_buffer(proc, new_buffer);
         }
         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                 printk(KERN_INFO "binder: %d: binder_alloc_buf size %d got "
                        "%p/n", proc->pid, size, buffer);
         buffer->data_size = data_size;
         buffer->offsets_size = offsets_size;
         buffer->async_transaction = is_async;
         if (is_async) {
                 proc->free_async_space -= size + sizeof(struct binder_buffer);
                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC_ASYNC)
                         printk(KERN_INFO "binder: %d: binder_alloc_buf size %d "
                                "async free %d/n", proc->pid, size,
                                proc->free_async_space);
         }
 
         return buffer;
 }
 
 static void *buffer_start_page(struct binder_buffer *buffer)
 {
         return (void *)((size_t)buffer & PAGE_MASK);
 }
 
 static void *buffer_end_page(struct binder_buffer *buffer)
 {
         return (void *)(((size_t)(buffer + 1) - 1) & PAGE_MASK);
 }
 
 static void binder_delete_free_buffer(
         struct binder_proc *proc, struct binder_buffer *buffer)
 {
         struct binder_buffer *prev, *next = NULL;
         int free_page_end = 1;
         int free_page_start = 1;
 
         BUG_ON(proc->buffers.next == &buffer->entry);
         prev = list_entry(buffer->entry.prev, struct binder_buffer, entry);
         BUG_ON(!prev->free);
         if (buffer_end_page(prev) == buffer_start_page(buffer)) {
                 free_page_start = 0;
                 if (buffer_end_page(prev) == buffer_end_page(buffer))
                         free_page_end = 0;
                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                         printk(KERN_INFO "binder: %d: merge free, buffer %p "
                                "share page with %p/n", proc->pid, buffer, prev);
         }
 
         if (!list_is_last(&buffer->entry, &proc->buffers)) {
                 next = list_entry(buffer->entry.next,
                                   struct binder_buffer, entry);
                 if (buffer_start_page(next) == buffer_end_page(buffer)) {
                         free_page_end = 0;
                         if (buffer_start_page(next) ==
                             buffer_start_page(buffer))
                                 free_page_start = 0;
                         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                                 printk(KERN_INFO "binder: %d: merge free, "
                                        "buffer %p share page with %p/n",
                                        proc->pid, buffer, prev);
                 }
         }
         list_del(&buffer->entry);
         if (free_page_start || free_page_end) {
                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                         printk(KERN_INFO "binder: %d: merge free, buffer %p do "
                                "not share page%s%s with with %p or %p/n",
                                proc->pid, buffer, free_page_start ? "" : " end",
                                free_page_end ? "" : " start", prev, next);
                 binder_update_page_range(proc, 0, free_page_start ?
                         buffer_start_page(buffer) : buffer_end_page(buffer),
                         (free_page_end ? buffer_end_page(buffer) :
                         buffer_start_page(buffer)) + PAGE_SIZE, NULL);
         }
 }
 
 static void binder_free_buf(
         struct binder_proc *proc, struct binder_buffer *buffer)
 {
         size_t size, buffer_size;
 
         buffer_size = binder_buffer_size(proc, buffer);
 
         size = ALIGN(buffer->data_size, sizeof(void *)) +
                 ALIGN(buffer->offsets_size, sizeof(void *));
         if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                 printk(KERN_INFO "binder: %d: binder_free_buf %p size %d buffer"
                        "_size %d/n", proc->pid, buffer, size, buffer_size);
 
         BUG_ON(buffer->free);
         BUG_ON(size > buffer_size);
         BUG_ON(buffer->transaction != NULL);
         BUG_ON((void *)buffer < proc->buffer);
         BUG_ON((void *)buffer > proc->buffer + proc->buffer_size);
 
         if (buffer->async_transaction) {
                 proc->free_async_space += size + sizeof(struct binder_buffer);
                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC_ASYNC)
                         printk(KERN_INFO "binder: %d: binder_free_buf size %d "
                                "async free %d/n", proc->pid, size,
                                proc->free_async_space);
         }
 
         binder_update_page_range(proc, 0,
                 (void *)PAGE_ALIGN((size_t)buffer->data),
                 (void *)(((size_t)buffer->data + buffer_size) & PAGE_MASK),
                 NULL);
         rb_erase(&buffer->rb_node, &proc->allocated_buffers);
         buffer->free = 1;
         if (!list_is_last(&buffer->entry, &proc->buffers)) {
                 struct binder_buffer *next = list_entry(buffer->entry.next,
                                                 struct binder_buffer, entry);
                 if (next->free) {
                         rb_erase(&next->rb_node, &proc->free_buffers);
                         binder_delete_free_buffer(proc, next);
                 }
         }
         if (proc->buffers.next != &buffer->entry) {
                 struct binder_buffer *prev = list_entry(buffer->entry.prev,
                                                 struct binder_buffer, entry);
                 if (prev->free) {
                         binder_delete_free_buffer(proc, buffer);
                         rb_erase(&prev->rb_node, &proc->free_buffers);
                         buffer = prev;
                 }
         }
         binder_insert_free_buffer(proc, buffer);
 }
 
 static struct binder_node *
 binder_get_node(struct binder_proc *proc, void __user *ptr)
 {
         struct rb_node *n = proc->nodes.rb_node;
         struct binder_node *node;
 
         while (n) {
                 node = rb_entry(n, struct binder_node, rb_node);
 
                 if (ptr < node->ptr)
                         n = n->rb_left;
                 else if (ptr > node->ptr)
                         n = n->rb_right;
                 else
                         return node;
         }
         return NULL;
 }
 
 static struct binder_node *
 binder_new_node(struct binder_proc *proc, void __user *ptr, void __user *cookie)
 {
         struct rb_node **p = &proc->nodes.rb_node;
         struct rb_node *parent = NULL;
         struct binder_node *node;
 
         while (*p) {
                 parent = *p;
                 node = rb_entry(parent, struct binder_node, rb_node);
 
                 if (ptr < node->ptr)
                         p = &(*p)->rb_left;
                 else if (ptr > node->ptr)
                         p = &(*p)->rb_right;
                 else
                         return NULL;
         }
 
         node = kzalloc(sizeof(*node), GFP_KERNEL);
         if (node == NULL)
                 return NULL;
         binder_stats.obj_created[BINDER_STAT_NODE]++;
         rb_link_node(&node->rb_node, parent, p);
         rb_insert_color(&node->rb_node, &proc->nodes);
         node->debug_id = ++binder_last_id;
         node->proc = proc;
         node->ptr = ptr;
         node->cookie = cookie;
         node->work.type = BINDER_WORK_NODE;
         INIT_LIST_HEAD(&node->work.entry);
         INIT_LIST_HEAD(&node->async_todo);
         if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                 printk(KERN_INFO "binder: %d:%d node %d u%p c%p created/n",
                        proc->pid, current->pid, node->debug_id,
                        node->ptr, node->cookie);
         return node;
 }
 
 static int
 binder_inc_node(struct binder_node *node, int strong, int internal,
                 struct list_head *target_list)
 {
         if (strong) {
                 if (internal) {
                         if (target_list == NULL &&
                             node->internal_strong_refs == 0 &&
                             !(node == binder_context_mgr_node &&
                             node->has_strong_ref)) {
                                 printk(KERN_ERR "binder: invalid inc strong "
                                         "node for %d/n", node->debug_id);
                                 return -EINVAL;
                         }
                         node->internal_strong_refs++;
                 } else
                         node->local_strong_refs++;
                 if (!node->has_strong_ref && target_list) {
                         list_del_init(&node->work.entry);
                         list_add_tail(&node->work.entry, target_list);
                 }
         } else {
                 if (!internal)
                         node->local_weak_refs++;
                 if (!node->has_weak_ref && list_empty(&node->work.entry)) {
                         if (target_list == NULL) {
                                 printk(KERN_ERR "binder: invalid inc weak node "
                                         "for %d/n", node->debug_id);
                                 return -EINVAL;
                         }
                         list_add_tail(&node->work.entry, target_list);
                 }
         }
         return 0;
 }
 
 static int
 binder_dec_node(struct binder_node *node, int strong, int internal)
 {
         if (strong) {
                 if (internal)
                         node->internal_strong_refs--;
                 else
                         node->local_strong_refs--;
                 if (node->local_strong_refs || node->internal_strong_refs)
                         return 0;
         } else {
                 if (!internal)
                         node->local_weak_refs--;
                 if (node->local_weak_refs || !hlist_empty(&node->refs))
                         return 0;
         }
         if (node->proc && (node->has_strong_ref || node->has_weak_ref)) {
                 if (list_empty(&node->work.entry)) {
                         list_add_tail(&node->work.entry, &node->proc->todo);
                         wake_up_interruptible(&node->proc->wait);
                 }
         } else {
                 if (hlist_empty(&node->refs) && !node->local_strong_refs &&
                     !node->local_weak_refs) {
                         list_del_init(&node->work.entry);
                         if (node->proc) {
                                 rb_erase(&node->rb_node, &node->proc->nodes);
                                 if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                                         printk(KERN_INFO "binder: refless node %d deleted/n", node->debug_id);
                         } else {
                                 hlist_del(&node->dead_node);
                                 if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                                         printk(KERN_INFO "binder: dead node %d deleted/n", node->debug_id);
                         }
                         kfree(node);
                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
                 }
         }
 
         return 0;
 }
 
 
 static struct binder_ref *
 binder_get_ref(struct binder_proc *proc, uint32_t desc)
 {
         struct rb_node *n = proc->refs_by_desc.rb_node;
         struct binder_ref *ref;
 
         while (n) {
                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
 
                 if (desc < ref->desc)
                         n = n->rb_left;
                 else if (desc > ref->desc)
                         n = n->rb_right;
                 else
                         return ref;
         }
         return NULL;
 }
 
 static struct binder_ref *
 binder_get_ref_for_node(struct binder_proc *proc, struct binder_node *node)
 {
         struct rb_node *n;
         struct rb_node **p = &proc->refs_by_node.rb_node;
         struct rb_node *parent = NULL;
         struct binder_ref *ref, *new_ref;
 
         while (*p) {
                 parent = *p;
                 ref = rb_entry(parent, struct binder_ref, rb_node_node);
 
                 if (node < ref->node)
                         p = &(*p)->rb_left;
                 else if (node > ref->node)
                         p = &(*p)->rb_right;
                 else
                         return ref;
         }
         new_ref = kzalloc(sizeof(*ref), GFP_KERNEL);
         if (new_ref == NULL)
                 return NULL;
         binder_stats.obj_created[BINDER_STAT_REF]++;
         new_ref->debug_id = ++binder_last_id;
         new_ref->proc = proc;
         new_ref->node = node;
         rb_link_node(&new_ref->rb_node_node, parent, p);
         rb_insert_color(&new_ref->rb_node_node, &proc->refs_by_node);
 
         new_ref->desc = (node == binder_context_mgr_node) ? 0 : 1;
         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
                 ref = rb_entry(n, struct binder_ref, rb_node_desc);
                 if (ref->desc > new_ref->desc)
                         break;
                 new_ref->desc = ref->desc + 1;
         }
 
         p = &proc->refs_by_desc.rb_node;
         while (*p) {
                 parent = *p;
                 ref = rb_entry(parent, struct binder_ref, rb_node_desc);
 
                 if (new_ref->desc < ref->desc)
                         p = &(*p)->rb_left;
                 else if (new_ref->desc > ref->desc)
                         p = &(*p)->rb_right;
                 else
                         BUG();
         }
         rb_link_node(&new_ref->rb_node_desc, parent, p);
         rb_insert_color(&new_ref->rb_node_desc, &proc->refs_by_desc);
         if (node) {
                 hlist_add_head(&new_ref->node_entry, &node->refs);
                 if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                         printk(KERN_INFO "binder: %d new ref %d desc %d for "
                                 "node %d/n", proc->pid, new_ref->debug_id,
                                 new_ref->desc, node->debug_id);
         } else {
                 if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                         printk(KERN_INFO "binder: %d new ref %d desc %d for "
                                 "dead node/n", proc->pid, new_ref->debug_id,
                                 new_ref->desc);
         }
         return new_ref;
 }
 
 static void
 binder_delete_ref(struct binder_ref *ref)
 {
         if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                 printk(KERN_INFO "binder: %d delete ref %d desc %d for "
                         "node %d/n", ref->proc->pid, ref->debug_id,
                         ref->desc, ref->node->debug_id);
         rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
         rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);
         if (ref->strong)
                 binder_dec_node(ref->node, 1, 1);
         hlist_del(&ref->node_entry);
         binder_dec_node(ref->node, 0, 1);
         if (ref->death) {
                 if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
                         printk(KERN_INFO "binder: %d delete ref %d desc %d "
                                 "has death notification/n", ref->proc->pid,
                                 ref->debug_id, ref->desc);
                 list_del(&ref->death->work.entry);
                 kfree(ref->death);
                 binder_stats.obj_deleted[BINDER_STAT_DEATH]++;
         }
         kfree(ref);
         binder_stats.obj_deleted[BINDER_STAT_REF]++;
 }
 
 static int
 binder_inc_ref(
         struct binder_ref *ref, int strong, struct list_head *target_list)
 {
         int ret;
         if (strong) {
                 if (ref->strong == 0) {
                         ret = binder_inc_node(ref->node, 1, 1, target_list);
                         if (ret)
                                 return ret;
                 }
                 ref->strong++;
         } else {
                 if (ref->weak == 0) {
                         ret = binder_inc_node(ref->node, 0, 1, target_list);
                         if (ret)
                                 return ret;
                 }
                 ref->weak++;
         }
         return 0;
 }
 
 
 static int
 binder_dec_ref(struct binder_ref *ref, int strong)
 {
         if (strong) {
                 if (ref->strong == 0) {
                         binder_user_error("binder: %d invalid dec strong, "
                                           "ref %d desc %d s %d w %d/n",
                                           ref->proc->pid, ref->debug_id,
                                           ref->desc, ref->strong, ref->weak);
                         return -EINVAL;
                 }
                 ref->strong--;
                 if (ref->strong == 0) {
                         int ret;
                         ret = binder_dec_node(ref->node, strong, 1);
                         if (ret)
                                 return ret;
                 }
         } else {
                 if (ref->weak == 0) {
                         binder_user_error("binder: %d invalid dec weak, "
                                           "ref %d desc %d s %d w %d/n",
                                           ref->proc->pid, ref->debug_id,
                                           ref->desc, ref->strong, ref->weak);
                         return -EINVAL;
                 }
                 ref->weak--;
         }
         if (ref->strong == 0 && ref->weak == 0)
                 binder_delete_ref(ref);
         return 0;
 }
 
 static void
 binder_pop_transaction(
         struct binder_thread *target_thread, struct binder_transaction *t)
 {
         if (target_thread) {
                 BUG_ON(target_thread->transaction_stack != t);
                 BUG_ON(target_thread->transaction_stack->from != target_thread);
                 target_thread->transaction_stack =
                         target_thread->transaction_stack->from_parent;
                 t->from = NULL;
         }
         t->need_reply = 0;
         if (t->buffer)
                 t->buffer->transaction = NULL;
         kfree(t);
         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
 }
 
 static void
 binder_send_failed_reply(struct binder_transaction *t, uint32_t error_code)
 {
         struct binder_thread *target_thread;
         BUG_ON(t->flags & TF_ONE_WAY);
         while (1) {
                 target_thread = t->from;
                 if (target_thread) {
                         if (target_thread->return_error != BR_OK &&
                            target_thread->return_error2 == BR_OK) {
                                 target_thread->return_error2 =
                                         target_thread->return_error;
                                 target_thread->return_error = BR_OK;
                         }
                         if (target_thread->return_error == BR_OK) {
                                 if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
                                         printk(KERN_INFO "binder: send failed reply for transaction %d to %d:%d/n",
                                                t->debug_id, target_thread->proc->pid, target_thread->pid);
 
                                 binder_pop_transaction(target_thread, t);
                                 target_thread->return_error = error_code;
                                 wake_up_interruptible(&target_thread->wait);
                         } else {
                                 printk(KERN_ERR "binder: reply failed, target "
                                         "thread, %d:%d, has error code %d "
                                         "already/n", target_thread->proc->pid,
                                         target_thread->pid,
                                         target_thread->return_error);
                         }
                         return;
                 } else {
                         struct binder_transaction *next = t->from_parent;
 
                         if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
                                 printk(KERN_INFO "binder: send failed reply "
                                         "for transaction %d, target dead/n",
                                         t->debug_id);
 
                         binder_pop_transaction(target_thread, t);
                         if (next == NULL) {
                                 if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
                                         printk(KERN_INFO "binder: reply failed,"
                                                 " no target thread at root/n");
                                 return;
                         }
                         t = next;
                         if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
                                 printk(KERN_INFO "binder: reply failed, no targ"
                                         "et thread -- retry %d/n", t->debug_id);
                 }
         }
 }
 
 static void
 binder_transaction_buffer_release(struct binder_proc *proc,
                         struct binder_buffer *buffer, size_t *failed_at);
 
 static void
 binder_transaction(struct binder_proc *proc, struct binder_thread *thread,
         struct binder_transaction_data *tr, int reply)
 {
         struct binder_transaction *t;
         struct binder_work *tcomplete;
         size_t *offp, *off_end;
         struct binder_proc *target_proc;
         struct binder_thread *target_thread = NULL;
         struct binder_node *target_node = NULL;
         struct list_head *target_list;
         wait_queue_head_t *target_wait;
         struct binder_transaction *in_reply_to = NULL;
         struct binder_transaction_log_entry *e;
         uint32_t return_error;
 
         e = binder_transaction_log_add(&binder_transaction_log);
         e->call_type = reply ? 2 : !!(tr->flags & TF_ONE_WAY);
         e->from_proc = proc->pid;
         e->from_thread = thread->pid;
         e->target_handle = tr->target.handle;
         e->data_size = tr->data_size;
         e->offsets_size = tr->offsets_size;
 
         if (reply) {
                 in_reply_to = thread->transaction_stack;
                 if (in_reply_to == NULL) {
                         binder_user_error("binder: %d:%d got reply transaction "
                                           "with no transaction stack/n",
                                           proc->pid, thread->pid);
                         return_error = BR_FAILED_REPLY;
                         goto err_empty_call_stack;
                 }
                 binder_set_nice(in_reply_to->saved_priority);
                 if (in_reply_to->to_thread != thread) {
                         binder_user_error("binder: %d:%d got reply transaction "
                                 "with bad transaction stack,"
                                 " transaction %d has target %d:%d/n",
                                 proc->pid, thread->pid, in_reply_to->debug_id,
                                 in_reply_to->to_proc ?
                                 in_reply_to->to_proc->pid : 0,
                                 in_reply_to->to_thread ?
                                 in_reply_to->to_thread->pid : 0);
                         return_error = BR_FAILED_REPLY;
                         in_reply_to = NULL;
                         goto err_bad_call_stack;
                 }
                 thread->transaction_stack = in_reply_to->to_parent;
                 target_thread = in_reply_to->from;
                 if (target_thread == NULL) {
                         return_error = BR_DEAD_REPLY;
                         goto err_dead_binder;
                 }
                 if (target_thread->transaction_stack != in_reply_to) {
                         binder_user_error("binder: %d:%d got reply transaction "
                                 "with bad target transaction stack %d, "
                                 "expected %d/n",
                                 proc->pid, thread->pid,
                                 target_thread->transaction_stack ?
                                 target_thread->transaction_stack->debug_id : 0,
                                 in_reply_to->debug_id);
                         return_error = BR_FAILED_REPLY;
                         in_reply_to = NULL;
                         target_thread = NULL;
                         goto err_dead_binder;
                 }
                 target_proc = target_thread->proc;
         } else {
                 if (tr->target.handle) {
                         struct binder_ref *ref;
                         ref = binder_get_ref(proc, tr->target.handle);
                         if (ref == NULL) {
                                 binder_user_error("binder: %d:%d got "
                                         "transaction to invalid handle/n",
                                         proc->pid, thread->pid);
                                 return_error = BR_FAILED_REPLY;
                                 goto err_invalid_target_handle;
                         }
                         target_node = ref->node;
                 } else {
                         target_node = binder_context_mgr_node;
                         if (target_node == NULL) {
                                 return_error = BR_DEAD_REPLY;
                                 goto err_no_context_mgr_node;
                         }
                 }
                 e->to_node = target_node->debug_id;
                 target_proc = target_node->proc;
                 if (target_proc == NULL) {
                         return_error = BR_DEAD_REPLY;
                         goto err_dead_binder;
                 }
                 if (!(tr->flags & TF_ONE_WAY) && thread->transaction_stack) {
                         struct binder_transaction *tmp;
                         tmp = thread->transaction_stack;
                         while (tmp) {
                                 if (tmp->from && tmp->from->proc == target_proc)
                                         target_thread = tmp->from;
                                 tmp = tmp->from_parent;
                         }
                 }
         }
         if (target_thread) {
                 e->to_thread = target_thread->pid;
                 target_list = &target_thread->todo;
                 target_wait = &target_thread->wait;
         } else {
                 target_list = &target_proc->todo;
                 target_wait = &target_proc->wait;
         }
         e->to_proc = target_proc->pid;
 
         /* TODO: reuse incoming transaction for reply */
         t = kzalloc(sizeof(*t), GFP_KERNEL);
         if (t == NULL) {
                 return_error = BR_FAILED_REPLY;
                 goto err_alloc_t_failed;
         }
         binder_stats.obj_created[BINDER_STAT_TRANSACTION]++;
 
         tcomplete = kzalloc(sizeof(*tcomplete), GFP_KERNEL);
         if (tcomplete == NULL) {
                 return_error = BR_FAILED_REPLY;
                 goto err_alloc_tcomplete_failed;
         }
         binder_stats.obj_created[BINDER_STAT_TRANSACTION_COMPLETE]++;
 
         t->debug_id = ++binder_last_id;
         e->debug_id = t->debug_id;
 
         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION) {
                 if (reply)
                         printk(KERN_INFO "binder: %d:%d BC_REPLY %d -> %d:%d, "
                                "data %p-%p size %d-%d/n",
                                proc->pid, thread->pid, t->debug_id,
                                target_proc->pid, target_thread->pid,
                                tr->data.ptr.buffer, tr->data.ptr.offsets,
                                tr->data_size, tr->offsets_size);
                 else
                         printk(KERN_INFO "binder: %d:%d BC_TRANSACTION %d -> "
                                "%d - node %d, data %p-%p size %d-%d/n",
                                proc->pid, thread->pid, t->debug_id,
                                target_proc->pid, target_node->debug_id,
                                tr->data.ptr.buffer, tr->data.ptr.offsets,
                                tr->data_size, tr->offsets_size);
         }
 
         if (!reply && !(tr->flags & TF_ONE_WAY))
                 t->from = thread;
         else
                 t->from = NULL;
         t->sender_euid = task_euid(proc->tsk);
         t->to_proc = target_proc;
         t->to_thread = target_thread;
         t->code = tr->code;
         t->flags = tr->flags;
         t->priority = task_nice(current);
         t->buffer = binder_alloc_buf(target_proc, tr->data_size,
                 tr->offsets_size, !reply && (t->flags & TF_ONE_WAY));
         if (t->buffer == NULL) {
                 return_error = BR_FAILED_REPLY;
                 goto err_binder_alloc_buf_failed;
         }
         t->buffer->allow_user_free = 0;
         t->buffer->debug_id = t->debug_id;
         t->buffer->transaction = t;
         t->buffer->target_node = target_node;
         if (target_node)
                 binder_inc_node(target_node, 1, 0, NULL);
 
         offp = (size_t *)(t->buffer->data + ALIGN(tr->data_size, sizeof(void *)));
 
         if (copy_from_user(t->buffer->data, tr->data.ptr.buffer, tr->data_size)) {
                 binder_user_error("binder: %d:%d got transaction with invalid "
                         "data ptr/n", proc->pid, thread->pid);
                 return_error = BR_FAILED_REPLY;
                 goto err_copy_data_failed;
         }
         if (copy_from_user(offp, tr->data.ptr.offsets, tr->offsets_size)) {
                 binder_user_error("binder: %d:%d got transaction with invalid "
                         "offsets ptr/n", proc->pid, thread->pid);
                 return_error = BR_FAILED_REPLY;
                 goto err_copy_data_failed;
         }
         off_end = (void *)offp + tr->offsets_size;
         for (; offp < off_end; offp++) {
                 struct flat_binder_object *fp;
                 if (*offp > t->buffer->data_size - sizeof(*fp)) {
                         binder_user_error("binder: %d:%d got transaction with "
                                 "invalid offset, %d/n",
                                 proc->pid, thread->pid, *offp);
                         return_error = BR_FAILED_REPLY;
                         goto err_bad_offset;
                 }
                 fp = (struct flat_binder_object *)(t->buffer->data + *offp);
                 switch (fp->type) {
                 case BINDER_TYPE_BINDER:
                 case BINDER_TYPE_WEAK_BINDER: {
                         struct binder_ref *ref;
                         struct binder_node *node = binder_get_node(proc, fp->binder);
                         if (node == NULL) {
                                 node = binder_new_node(proc, fp->binder, fp->cookie);
                                 if (node == NULL) {
                                         return_error = BR_FAILED_REPLY;
                                         goto err_binder_new_node_failed;
                                 }
                                 node->min_priority = fp->flags & FLAT_BINDER_FLAG_PRIORITY_MASK;
                                 node->accept_fds = !!(fp->flags & FLAT_BINDER_FLAG_ACCEPTS_FDS);
                         }
                         if (fp->cookie != node->cookie) {
                                 binder_user_error("binder: %d:%d sending u%p "
                                         "node %d, cookie mismatch %p != %p/n",
                                         proc->pid, thread->pid,
                                         fp->binder, node->debug_id,
                                         fp->cookie, node->cookie);
                                 goto err_binder_get_ref_for_node_failed;
                         }
                         ref = binder_get_ref_for_node(target_proc, node);
                         if (ref == NULL) {
                                 return_error = BR_FAILED_REPLY;
                                 goto err_binder_get_ref_for_node_failed;
                         }
                         if (fp->type == BINDER_TYPE_BINDER)
                                 fp->type = BINDER_TYPE_HANDLE;
                         else
                                 fp->type = BINDER_TYPE_WEAK_HANDLE;
                         fp->handle = ref->desc;
                         binder_inc_ref(ref, fp->type == BINDER_TYPE_HANDLE, &thread->todo);
                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                                 printk(KERN_INFO "        node %d u%p -> ref %d desc %d/n",
                                        node->debug_id, node->ptr, ref->debug_id, ref->desc);
                 } break;
                 case BINDER_TYPE_HANDLE:
                 case BINDER_TYPE_WEAK_HANDLE: {
                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
                         if (ref == NULL) {
                                 binder_user_error("binder: %d:%d got "
                                         "transaction with invalid "
                                         "handle, %ld/n", proc->pid,
                                         thread->pid, fp->handle);
                                 return_error = BR_FAILED_REPLY;
                                 goto err_binder_get_ref_failed;
                         }
                         if (ref->node->proc == target_proc) {
                                 if (fp->type == BINDER_TYPE_HANDLE)
                                         fp->type = BINDER_TYPE_BINDER;
                                 else
                                         fp->type = BINDER_TYPE_WEAK_BINDER;
                                 fp->binder = ref->node->ptr;
                                 fp->cookie = ref->node->cookie;
                                 binder_inc_node(ref->node, fp->type == BINDER_TYPE_BINDER, 0, NULL);
                                 if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                                         printk(KERN_INFO "        ref %d desc %d -> node %d u%p/n",
                                                ref->debug_id, ref->desc, ref->node->debug_id, ref->node->ptr);
                         } else {
                                 struct binder_ref *new_ref;
                                 new_ref = binder_get_ref_for_node(target_proc, ref->node);
                                 if (new_ref == NULL) {
                                         return_error = BR_FAILED_REPLY;
                                         goto err_binder_get_ref_for_node_failed;
                                 }
                                 fp->handle = new_ref->desc;
                                 binder_inc_ref(new_ref, fp->type == BINDER_TYPE_HANDLE, NULL);
                                 if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                                         printk(KERN_INFO "        ref %d desc %d -> ref %d desc %d (node %d)/n",
                                                ref->debug_id, ref->desc, new_ref->debug_id, new_ref->desc, ref->node->debug_id);
                         }
                 } break;
 
                 case BINDER_TYPE_FD: {
                         int target_fd;
                         struct file *file;
 
                         if (reply) {
                                 if (!(in_reply_to->flags & TF_ACCEPT_FDS)) {
                                         binder_user_error("binder: %d:%d got reply with fd, %ld, but target does not allow fds/n",
                                                 proc->pid, thread->pid, fp->handle);
                                         return_error = BR_FAILED_REPLY;
                                         goto err_fd_not_allowed;
                                 }
                         } else if (!target_node->accept_fds) {
                                 binder_user_error("binder: %d:%d got transaction with fd, %ld, but target does not allow fds/n",
                                         proc->pid, thread->pid, fp->handle);
                                 return_error = BR_FAILED_REPLY;
                                 goto err_fd_not_allowed;
                         }
 
                         file = fget(fp->handle);
                         if (file == NULL) {
                                 binder_user_error("binder: %d:%d got transaction with invalid fd, %ld/n",
                                         proc->pid, thread->pid, fp->handle);
                                 return_error = BR_FAILED_REPLY;
                                 goto err_fget_failed;
                         }
                         target_fd = task_get_unused_fd_flags(target_proc->tsk, O_CLOEXEC);
                         if (target_fd < 0) {
                                 fput(file);
                                 return_error = BR_FAILED_REPLY;
                                 goto err_get_unused_fd_failed;
                         }
                         task_fd_install(target_proc->tsk, target_fd, file);
                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                                 printk(KERN_INFO "        fd %ld -> %d/n", fp->handle, target_fd);
                         /* TODO: fput? */
                         fp->handle = target_fd;
                 } break;
 
                 default:
                         binder_user_error("binder: %d:%d got transactio"
                                 "n with invalid object type, %lx/n",
                                 proc->pid, thread->pid, fp->type);
                         return_error = BR_FAILED_REPLY;
                         goto err_bad_object_type;
                 }
         }
         if (reply) {
                 BUG_ON(t->buffer->async_transaction != 0);
                 binder_pop_transaction(target_thread, in_reply_to);
         } else if (!(t->flags & TF_ONE_WAY)) {
                 BUG_ON(t->buffer->async_transaction != 0);
                 t->need_reply = 1;
                 t->from_parent = thread->transaction_stack;
                 thread->transaction_stack = t;
         } else {
                 BUG_ON(target_node == NULL);
                 BUG_ON(t->buffer->async_transaction != 1);
                 if (target_node->has_async_transaction) {
                         target_list = &target_node->async_todo;
                         target_wait = NULL;
                 } else
                         target_node->has_async_transaction = 1;
         }
         t->work.type = BINDER_WORK_TRANSACTION;
         list_add_tail(&t->work.entry, target_list);
         tcomplete->type = BINDER_WORK_TRANSACTION_COMPLETE;
         list_add_tail(&tcomplete->entry, &thread->todo);
         if (target_wait)
                 wake_up_interruptible(target_wait);
         return;
 
 err_get_unused_fd_failed:
 err_fget_failed:
 err_fd_not_allowed:
 err_binder_get_ref_for_node_failed:
 err_binder_get_ref_failed:
 err_binder_new_node_failed:
 err_bad_object_type:
 err_bad_offset:
 err_copy_data_failed:
         binder_transaction_buffer_release(target_proc, t->buffer, offp);
         t->buffer->transaction = NULL;
         binder_free_buf(target_proc, t->buffer);
 err_binder_alloc_buf_failed:
         kfree(tcomplete);
         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
 err_alloc_tcomplete_failed:
         kfree(t);
         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
 err_alloc_t_failed:
 err_bad_call_stack:
 err_empty_call_stack:
 err_dead_binder:
 err_invalid_target_handle:
 err_no_context_mgr_node:
         if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
                 printk(KERN_INFO "binder: %d:%d transaction failed %d, size %d-%d/n",
                            proc->pid, thread->pid, return_error,
                            tr->data_size, tr->offsets_size);
 
         {
                 struct binder_transaction_log_entry *fe;
                 fe = binder_transaction_log_add(&binder_transaction_log_failed);
                 *fe = *e;
         }
 
         BUG_ON(thread->return_error != BR_OK);
         if (in_reply_to) {
                 thread->return_error = BR_TRANSACTION_COMPLETE;
                 binder_send_failed_reply(in_reply_to, return_error);
         } else
                 thread->return_error = return_error;
 }
 
 static void
 binder_transaction_buffer_release(struct binder_proc *proc, struct binder_buffer *buffer, size_t *failed_at)
 {
         size_t *offp, *off_end;
         int debug_id = buffer->debug_id;
 
         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                 printk(KERN_INFO "binder: %d buffer release %d, size %d-%d, failed at %p/n",
                            proc->pid, buffer->debug_id,
                            buffer->data_size, buffer->offsets_size, failed_at);
 
         if (buffer->target_node)
                 binder_dec_node(buffer->target_node, 1, 0);
 
         offp = (size_t *)(buffer->data + ALIGN(buffer->data_size, sizeof(void *)));
         if (failed_at)
                 off_end = failed_at;
         else
                 off_end = (void *)offp + buffer->offsets_size;
         for (; offp < off_end; offp++) {
                 struct flat_binder_object *fp;
                 if (*offp > buffer->data_size - sizeof(*fp)) {
                         printk(KERN_ERR "binder: transaction release %d bad offset %d, size %d/n", debug_id, *offp, buffer->data_size);
                         continue;
                 }
                 fp = (struct flat_binder_object *)(buffer->data + *offp);
                 switch (fp->type) {
                 case BINDER_TYPE_BINDER:
                 case BINDER_TYPE_WEAK_BINDER: {
                         struct binder_node *node = binder_get_node(proc, fp->binder);
                         if (node == NULL) {
                                 printk(KERN_ERR "binder: transaction release %d bad node %p/n", debug_id, fp->binder);
                                 break;
                         }
                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                                 printk(KERN_INFO "        node %d u%p/n",
                                        node->debug_id, node->ptr);
                         binder_dec_node(node, fp->type == BINDER_TYPE_BINDER, 0);
                 } break;
                 case BINDER_TYPE_HANDLE:
                 case BINDER_TYPE_WEAK_HANDLE: {
                         struct binder_ref *ref = binder_get_ref(proc, fp->handle);
                         if (ref == NULL) {
                                 printk(KERN_ERR "binder: transaction release %d bad handle %ld/n", debug_id, fp->handle);
                                 break;
                         }
                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                                 printk(KERN_INFO "        ref %d desc %d (node %d)/n",
                                        ref->debug_id, ref->desc, ref->node->debug_id);
                         binder_dec_ref(ref, fp->type == BINDER_TYPE_HANDLE);
                 } break;
 
                 case BINDER_TYPE_FD:
                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                                 printk(KERN_INFO "        fd %ld/n", fp->handle);
                         if (failed_at)
                                 task_close_fd(proc->tsk, fp->handle);
                         break;
 
                 default:
                         printk(KERN_ERR "binder: transaction release %d bad object type %lx/n", debug_id, fp->type);
                         break;
                 }
         }
 }
 
 int
 binder_thread_write(struct binder_proc *proc, struct binder_thread *thread,
                     void __user *buffer, int size, signed long *consumed)
 {
         uint32_t cmd;
         void __user *ptr = buffer + *consumed;
         void __user *end = buffer + size;
 
         while (ptr < end && thread->return_error == BR_OK) {
                 if (get_user(cmd, (uint32_t __user *)ptr))
                         return -EFAULT;
                 ptr += sizeof(uint32_t);
                 if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.bc)) {
                         binder_stats.bc[_IOC_NR(cmd)]++;
                         proc->stats.bc[_IOC_NR(cmd)]++;
                         thread->stats.bc[_IOC_NR(cmd)]++;
                 }
                 switch (cmd) {
                 case BC_INCREFS:
                 case BC_ACQUIRE:
                 case BC_RELEASE:
                 case BC_DECREFS: {
                         uint32_t target;
                         struct binder_ref *ref;
                         const char *debug_string;
 
                         if (get_user(target, (uint32_t __user *)ptr))
                                 return -EFAULT;
                         ptr += sizeof(uint32_t);
                         if (target == 0 && binder_context_mgr_node &&
                             (cmd == BC_INCREFS || cmd == BC_ACQUIRE)) {
                                 ref = binder_get_ref_for_node(proc,
                                                binder_context_mgr_node);
                                 if (ref->desc != target) {
                                         binder_user_error("binder: %d:"
                                                 "%d tried to acquire "
                                                 "reference to desc 0, "
                                                 "got %d instead/n",
                                                 proc->pid, thread->pid,
                                                 ref->desc);
                                 }
                         } else
                                 ref = binder_get_ref(proc, target);
                         if (ref == NULL) {
                                 binder_user_error("binder: %d:%d refcou"
                                         "nt change on invalid ref %d/n",
                                         proc->pid, thread->pid, target);
                                 break;
                         }
                         switch (cmd) {
                         case BC_INCREFS:
                                 debug_string = "IncRefs";
                                 binder_inc_ref(ref, 0, NULL);
                                 break;
                         case BC_ACQUIRE:
                                 debug_string = "Acquire";
                                 binder_inc_ref(ref, 1, NULL);
                                 break;
                         case BC_RELEASE:
                                 debug_string = "Release";
                                 binder_dec_ref(ref, 1);
                                 break;
                         case BC_DECREFS:
                         default:
                                 debug_string = "DecRefs";
                                 binder_dec_ref(ref, 0);
                                 break;
                         }
                         if (binder_debug_mask & BINDER_DEBUG_USER_REFS)
                                 printk(KERN_INFO "binder: %d:%d %s ref %d desc %d s %d w %d for node %d/n",
                                        proc->pid, thread->pid, debug_string, ref->debug_id, ref->desc, ref->strong, ref->weak, ref->node->debug_id);
                         break;
                 }
                 case BC_INCREFS_DONE:
                 case BC_ACQUIRE_DONE: {
                         void __user *node_ptr;
                         void *cookie;
                         struct binder_node *node;
 
                         if (get_user(node_ptr, (void * __user *)ptr))
                                 return -EFAULT;
                         ptr += sizeof(void *);
                         if (get_user(cookie, (void * __user *)ptr))
                                 return -EFAULT;
                         ptr += sizeof(void *);
                         node = binder_get_node(proc, node_ptr);
                         if (node == NULL) {
                                 binder_user_error("binder: %d:%d "
                                         "%s u%p no match/n",
                                         proc->pid, thread->pid,
                                         cmd == BC_INCREFS_DONE ?
                                         "BC_INCREFS_DONE" :
                                         "BC_ACQUIRE_DONE",
                                         node_ptr);
                                 break;
                         }
                         if (cookie != node->cookie) {
                                 binder_user_error("binder: %d:%d %s u%p node %d"
                                         " cookie mismatch %p != %p/n",
                                         proc->pid, thread->pid,
                                         cmd == BC_INCREFS_DONE ?
                                         "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE",
                                         node_ptr, node->debug_id,
                                         cookie, node->cookie);
                                 break;
                         }
                         if (cmd == BC_ACQUIRE_DONE) {
                                 if (node->pending_strong_ref == 0) {
                                         binder_user_error("binder: %d:%d "
                                                 "BC_ACQUIRE_DONE node %d has "
                                                 "no pending acquire request/n",
                                                 proc->pid, thread->pid,
                                                 node->debug_id);
                                         break;
                                 }
                                 node->pending_strong_ref = 0;
                         } else {
                                 if (node->pending_weak_ref == 0) {
                                         binder_user_error("binder: %d:%d "
                                                 "BC_INCREFS_DONE node %d has "
                                                 "no pending increfs request/n",
                                                 proc->pid, thread->pid,
                                                 node->debug_id);
                                         break;
                                 }
                                 node->pending_weak_ref = 0;
                         }
                         binder_dec_node(node, cmd == BC_ACQUIRE_DONE, 0);
                         if (binder_debug_mask & BINDER_DEBUG_USER_REFS)
                                 printk(KERN_INFO "binder: %d:%d %s node %d ls %d lw %d/n",
                                        proc->pid, thread->pid, cmd == BC_INCREFS_DONE ? "BC_INCREFS_DONE" : "BC_ACQUIRE_DONE", node->debug_id, node->local_strong_refs, node->local_weak_refs);
                         break;
                 }
                 case BC_ATTEMPT_ACQUIRE:
                         printk(KERN_ERR "binder: BC_ATTEMPT_ACQUIRE not supported/n");
                         return -EINVAL;
                 case BC_ACQUIRE_RESULT:
                         printk(KERN_ERR "binder: BC_ACQUIRE_RESULT not supported/n");
                         return -EINVAL;
 
                 case BC_FREE_BUFFER: {
                         void __user *data_ptr;
                         struct binder_buffer *buffer;
 
                         if (get_user(data_ptr, (void * __user *)ptr))
                                 return -EFAULT;
                         ptr += sizeof(void *);
 
                         buffer = binder_buffer_lookup(proc, data_ptr);
                         if (buffer == NULL) {
                                 binder_user_error("binder: %d:%d "
                                         "BC_FREE_BUFFER u%p no match/n",
                                         proc->pid, thread->pid, data_ptr);
                                 break;
                         }
                         if (!buffer->allow_user_free) {
                                 binder_user_error("binder: %d:%d "
                                         "BC_FREE_BUFFER u%p matched "
                                         "unreturned buffer/n",
                                         proc->pid, thread->pid, data_ptr);
                                 break;
                         }
                         if (binder_debug_mask & BINDER_DEBUG_FREE_BUFFER)
                                 printk(KERN_INFO "binder: %d:%d BC_FREE_BUFFER u%p found buffer %d for %s transaction/n",
                                        proc->pid, thread->pid, data_ptr, buffer->debug_id,
                                        buffer->transaction ? "active" : "finished");
 
                         if (buffer->transaction) {
                                 buffer->transaction->buffer = NULL;
                                 buffer->transaction = NULL;
                         }
                         if (buffer->async_transaction && buffer->target_node) {
                                 BUG_ON(!buffer->target_node->has_async_transaction);
                                 if (list_empty(&buffer->target_node->async_todo))
                                         buffer->target_node->has_async_transaction = 0;
                                 else
                                         list_move_tail(buffer->target_node->async_todo.next, &thread->todo);
                         }
                         binder_transaction_buffer_release(proc, buffer, NULL);
                         binder_free_buf(proc, buffer);
                         break;
                 }
 
                 case BC_TRANSACTION:
                 case BC_REPLY: {
                         struct binder_transaction_data tr;
 
                         if (copy_from_user(&tr, ptr, sizeof(tr)))
                                 return -EFAULT;
                         ptr += sizeof(tr);
                         binder_transaction(proc, thread, &tr, cmd == BC_REPLY);
                         break;
                 }
 
                 case BC_REGISTER_LOOPER:
                         if (binder_debug_mask & BINDER_DEBUG_THREADS)
                                 printk(KERN_INFO "binder: %d:%d BC_REGISTER_LOOPER/n",
                                        proc->pid, thread->pid);
                         if (thread->looper & BINDER_LOOPER_STATE_ENTERED) {
                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
                                 binder_user_error("binder: %d:%d ERROR:"
                                         " BC_REGISTER_LOOPER called "
                                         "after BC_ENTER_LOOPER/n",
                                         proc->pid, thread->pid);
                         } else if (proc->requested_threads == 0) {
                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
                                 binder_user_error("binder: %d:%d ERROR:"
                                         " BC_REGISTER_LOOPER called "
                                         "without request/n",
                                         proc->pid, thread->pid);
                         } else {
                                 proc->requested_threads--;
                                 proc->requested_threads_started++;
                         }
                         thread->looper |= BINDER_LOOPER_STATE_REGISTERED;
                         break;
                 case BC_ENTER_LOOPER:
                         if (binder_debug_mask & BINDER_DEBUG_THREADS)
                                 printk(KERN_INFO "binder: %d:%d BC_ENTER_LOOPER/n",
                                        proc->pid, thread->pid);
                         if (thread->looper & BINDER_LOOPER_STATE_REGISTERED) {
                                 thread->looper |= BINDER_LOOPER_STATE_INVALID;
                                 binder_user_error("binder: %d:%d ERROR:"
                                         " BC_ENTER_LOOPER called after "
                                         "BC_REGISTER_LOOPER/n",
                                         proc->pid, thread->pid);
                         }
                         thread->looper |= BINDER_LOOPER_STATE_ENTERED;
                         break;
                 case BC_EXIT_LOOPER:
                         if (binder_debug_mask & BINDER_DEBUG_THREADS)
                                 printk(KERN_INFO "binder: %d:%d BC_EXIT_LOOPER/n",
                                        proc->pid, thread->pid);
                         thread->looper |= BINDER_LOOPER_STATE_EXITED;
                         break;
 
                 case BC_REQUEST_DEATH_NOTIFICATION:
                 case BC_CLEAR_DEATH_NOTIFICATION: {
                         uint32_t target;
                         void __user *cookie;
                         struct binder_ref *ref;
                         struct binder_ref_death *death;
 
                         if (get_user(target, (uint32_t __user *)ptr))
                                 return -EFAULT;
                         ptr += sizeof(uint32_t);
                         if (get_user(cookie, (void __user * __user *)ptr))
                                 return -EFAULT;
                         ptr += sizeof(void *);
                         ref = binder_get_ref(proc, target);
                         if (ref == NULL) {
                                 binder_user_error("binder: %d:%d %s "
                                         "invalid ref %d/n",
                                         proc->pid, thread->pid,
                                         cmd == BC_REQUEST_DEATH_NOTIFICATION ?
                                         "BC_REQUEST_DEATH_NOTIFICATION" :
                                         "BC_CLEAR_DEATH_NOTIFICATION",
                                         target);
                                 break;
                         }
 
                         if (binder_debug_mask & BINDER_DEBUG_DEATH_NOTIFICATION)
                                 printk(KERN_INFO "binder: %d:%d %s %p ref %d desc %d s %d w %d for node %d/n",
                                        proc->pid, thread->pid,
                                        cmd == BC_REQUEST_DEATH_NOTIFICATION ?
                                        "BC_REQUEST_DEATH_NOTIFICATION" :
                                        "BC_CLEAR_DEATH_NOTIFICATION",
                                        cookie, ref->debug_id, ref->desc,
                                        ref->strong, ref->weak, ref->node->debug_id);
 
                         if (cmd == BC_REQUEST_DEATH_NOTIFICATION) {
                                 if (ref->death) {
                                         binder_user_error("binder: %d:%"
                                                 "d BC_REQUEST_DEATH_NOTI"
                                                 "FICATION death notific"
                                                 "ation already set/n",
                                                 proc->pid, thread->pid);
                                         break;
                                 }
                                 death = kzalloc(sizeof(*death), GFP_KERNEL);
                                 if (death == NULL) {
                                         thread->return_error = BR_ERROR;
                                         if (binder_debug_mask & BINDER_DEBUG_FAILED_TRANSACTION)
                                                 printk(KERN_INFO "binder: %d:%d "
                                                         "BC_REQUEST_DEATH_NOTIFICATION failed/n",
                                                         proc->pid, thread->pid);
                                         break;
                                 }
                                 binder_stats.obj_created[BINDER_STAT_DEATH]++;
                                 INIT_LIST_HEAD(&death->work.entry);
                                 death->cookie = cookie;
                                 ref->death = death;
                                 if (ref->node->proc == NULL) {
                                         ref->death->work.type = BINDER_WORK_DEAD_BINDER;
                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
                                                 list_add_tail(&ref->death->work.entry, &thread->todo);
                                         } else {
                                                 list_add_tail(&ref->death->work.entry, &proc->todo);
                                                 wake_up_interruptible(&proc->wait);
                                         }
                                 }
                         } else {
                                 if (ref->death == NULL) {
                                         binder_user_error("binder: %d:%"
                                                 "d BC_CLEAR_DEATH_NOTIFI"
                                                 "CATION death notificat"
                                                 "ion not active/n",
                                                 proc->pid, thread->pid);
                                         break;
                                 }
                                 death = ref->death;
                                 if (death->cookie != cookie) {
                                         binder_user_error("binder: %d:%"
                                                 "d BC_CLEAR_DEATH_NOTIFI"
                                                 "CATION death notificat"
                                                 "ion cookie mismatch "
                                                 "%p != %p/n",
                                                 proc->pid, thread->pid,
                                                 death->cookie, cookie);
                                         break;
                                 }
                                 ref->death = NULL;
                                 if (list_empty(&death->work.entry)) {
                                         death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
                                         if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
                                                 list_add_tail(&death->work.entry, &thread->todo);
                                         } else {
                                                 list_add_tail(&death->work.entry, &proc->todo);
                                                 wake_up_interruptible(&proc->wait);
                                         }
                                 } else {
                                         BUG_ON(death->work.type != BINDER_WORK_DEAD_BINDER);
                                         death->work.type = BINDER_WORK_DEAD_BINDER_AND_CLEAR;
                                 }
                         }
                 } break;
                 case BC_DEAD_BINDER_DONE: {
                         struct binder_work *w;
                         void __user *cookie;
                         struct binder_ref_death *death = NULL;
                         if (get_user(cookie, (void __user * __user *)ptr))
                                 return -EFAULT;
 
                         ptr += sizeof(void *);
                         list_for_each_entry(w, &proc->delivered_death, entry) {
                                 struct binder_ref_death *tmp_death = container_of(w, struct binder_ref_death, work);
                                 if (tmp_death->cookie == cookie) {
                                         death = tmp_death;
                                         break;
                                 }
                         }
                         if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
                                 printk(KERN_INFO "binder: %d:%d BC_DEAD_BINDER_DONE %p found %p/n",
                                        proc->pid, thread->pid, cookie, death);
                         if (death == NULL) {
                                 binder_user_error("binder: %d:%d BC_DEAD"
                                         "_BINDER_DONE %p not found/n",
                                         proc->pid, thread->pid, cookie);
                                 break;
                         }
 
                         list_del_init(&death->work.entry);
                         if (death->work.type == BINDER_WORK_DEAD_BINDER_AND_CLEAR) {
                                 death->work.type = BINDER_WORK_CLEAR_DEATH_NOTIFICATION;
                                 if (thread->looper & (BINDER_LOOPER_STATE_REGISTERED | BINDER_LOOPER_STATE_ENTERED)) {
                                         list_add_tail(&death->work.entry, &thread->todo);
                                 } else {
                                         list_add_tail(&death->work.entry, &proc->todo);
                                         wake_up_interruptible(&proc->wait);
                                 }
                         }
                 } break;
 
                 default:
                         printk(KERN_ERR "binder: %d:%d unknown command %d/n", proc->pid, thread->pid, cmd);
                         return -EINVAL;
                 }
                 *consumed = ptr - buffer;
         }
         return 0;
 }
 
 void
 binder_stat_br(struct binder_proc *proc, struct binder_thread *thread, uint32_t cmd)
 {
         if (_IOC_NR(cmd) < ARRAY_SIZE(binder_stats.br)) {
                 binder_stats.br[_IOC_NR(cmd)]++;
                 proc->stats.br[_IOC_NR(cmd)]++;
                 thread->stats.br[_IOC_NR(cmd)]++;
         }
 }
 
 static int
 binder_has_proc_work(struct binder_proc *proc, struct binder_thread *thread)
 {
         return !list_empty(&proc->todo) || (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
 }
 
 static int
 binder_has_thread_work(struct binder_thread *thread)
 {
         return !list_empty(&thread->todo) || thread->return_error != BR_OK ||
                 (thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
 }
 
 static int
 binder_thread_read(struct binder_proc *proc, struct binder_thread *thread,
         void  __user *buffer, int size, signed long *consumed, int non_block)
 {
         void __user *ptr = buffer + *consumed;
         void __user *end = buffer + size;
 
         int ret = 0;
         int wait_for_proc_work;
 
         if (*consumed == 0) {
                 if (put_user(BR_NOOP, (uint32_t __user *)ptr))
                         return -EFAULT;
                 ptr += sizeof(uint32_t);
         }
 
 retry:
         wait_for_proc_work = thread->transaction_stack == NULL && list_empty(&thread->todo);
 
         if (thread->return_error != BR_OK && ptr < end) {
                 if (thread->return_error2 != BR_OK) {
                         if (put_user(thread->return_error2, (uint32_t __user *)ptr))
                                 return -EFAULT;
                         ptr += sizeof(uint32_t);
                         if (ptr == end)
                                 goto done;
                         thread->return_error2 = BR_OK;
                 }
                 if (put_user(thread->return_error, (uint32_t __user *)ptr))
                         return -EFAULT;
                 ptr += sizeof(uint32_t);
                 thread->return_error = BR_OK;
                 goto done;
         }
 
 
         thread->looper |= BINDER_LOOPER_STATE_WAITING;
         if (wait_for_proc_work)
                 proc->ready_threads++;
         mutex_unlock(&binder_lock);
         if (wait_for_proc_work) {
                 if (!(thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
                                         BINDER_LOOPER_STATE_ENTERED))) {
                         binder_user_error("binder: %d:%d ERROR: Thread waiting "
                                 "for process work before calling BC_REGISTER_"
                                 "LOOPER or BC_ENTER_LOOPER (state %x)/n",
                                 proc->pid, thread->pid, thread->looper);
                         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
                 }
                 binder_set_nice(proc->default_priority);
                 if (non_block) {
                         if (!binder_has_proc_work(proc, thread))
                                 ret = -EAGAIN;
                 } else
                         ret = wait_event_interruptible_exclusive(proc->wait, binder_has_proc_work(proc, thread));
         } else {
                 if (non_block) {
                         if (!binder_has_thread_work(thread))
                                 ret = -EAGAIN;
                 } else
                         ret = wait_event_interruptible(thread->wait, binder_has_thread_work(thread));
         }
         mutex_lock(&binder_lock);
         if (wait_for_proc_work)
                 proc->ready_threads--;
         thread->looper &= ~BINDER_LOOPER_STATE_WAITING;
 
         if (ret)
                 return ret;
 
         while (1) {
                 uint32_t cmd;
                 struct binder_transaction_data tr;
                 struct binder_work *w;
                 struct binder_transaction *t = NULL;
 
                 if (!list_empty(&thread->todo))
                         w = list_first_entry(&thread->todo, struct binder_work, entry);
                 else if (!list_empty(&proc->todo) && wait_for_proc_work)
                         w = list_first_entry(&proc->todo, struct binder_work, entry);
                 else {
                         if (ptr - buffer == 4 && !(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN)) /* no data added */
                                 goto retry;
                         break;
                 }
 
                 if (end - ptr < sizeof(tr) + 4)
                         break;
 
                 switch (w->type) {
                 case BINDER_WORK_TRANSACTION: {
                         t = container_of(w, struct binder_transaction, work);
                 } break;
                 case BINDER_WORK_TRANSACTION_COMPLETE: {
                         cmd = BR_TRANSACTION_COMPLETE;
                         if (put_user(cmd, (uint32_t __user *)ptr))
                                 return -EFAULT;
                         ptr += sizeof(uint32_t);
 
                         binder_stat_br(proc, thread, cmd);
                         if (binder_debug_mask & BINDER_DEBUG_TRANSACTION_COMPLETE)
                                 printk(KERN_INFO "binder: %d:%d BR_TRANSACTION_COMPLETE/n",
                                        proc->pid, thread->pid);
 
                         list_del(&w->entry);
                         kfree(w);
                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
                 } break;
                 case BINDER_WORK_NODE: {
                         struct binder_node *node = container_of(w, struct binder_node, work);
                         uint32_t cmd = BR_NOOP;
                         const char *cmd_name;
                         int strong = node->internal_strong_refs || node->local_strong_refs;
                         int weak = !hlist_empty(&node->refs) || node->local_weak_refs || strong;
                         if (weak && !node->has_weak_ref) {
                                 cmd = BR_INCREFS;
                                 cmd_name = "BR_INCREFS";
                                 node->has_weak_ref = 1;
                                 node->pending_weak_ref = 1;
                                 node->local_weak_refs++;
                         } else if (strong && !node->has_strong_ref) {
                                 cmd = BR_ACQUIRE;
                                 cmd_name = "BR_ACQUIRE";
                                 node->has_strong_ref = 1;
                                 node->pending_strong_ref = 1;
                                 node->local_strong_refs++;
                         } else if (!strong && node->has_strong_ref) {
                                 cmd = BR_RELEASE;
                                 cmd_name = "BR_RELEASE";
                                 node->has_strong_ref = 0;
                         } else if (!weak && node->has_weak_ref) {
                                 cmd = BR_DECREFS;
                                 cmd_name = "BR_DECREFS";
                                 node->has_weak_ref = 0;
                         }
                         if (cmd != BR_NOOP) {
                                 if (put_user(cmd, (uint32_t __user *)ptr))
                                         return -EFAULT;
                                 ptr += sizeof(uint32_t);
                                 if (put_user(node->ptr, (void * __user *)ptr))
                                         return -EFAULT;
                                 ptr += sizeof(void *);
                                 if (put_user(node->cookie, (void * __user *)ptr))
                                         return -EFAULT;
                                 ptr += sizeof(void *);
 
                                 binder_stat_br(proc, thread, cmd);
                                 if (binder_debug_mask & BINDER_DEBUG_USER_REFS)
                                         printk(KERN_INFO "binder: %d:%d %s %d u%p c%p/n",
                                                proc->pid, thread->pid, cmd_name, node->debug_id, node->ptr, node->cookie);
                         } else {
                                 list_del_init(&w->entry);
                                 if (!weak && !strong) {
                                         if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                                                 printk(KERN_INFO "binder: %d:%d node %d u%p c%p deleted/n",
                                                        proc->pid, thread->pid, node->debug_id, node->ptr, node->cookie);
                                         rb_erase(&node->rb_node, &proc->nodes);
                                         kfree(node);
                                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
                                 } else {
                                         if (binder_debug_mask & BINDER_DEBUG_INTERNAL_REFS)
                                                 printk(KERN_INFO "binder: %d:%d node %d u%p c%p state unchanged/n",
                                                        proc->pid, thread->pid, node->debug_id, node->ptr, node->cookie);
                                 }
                         }
                 } break;
                 case BINDER_WORK_DEAD_BINDER:
                 case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
                 case BINDER_WORK_CLEAR_DEATH_NOTIFICATION: {
                         struct binder_ref_death *death = container_of(w, struct binder_ref_death, work);
                         uint32_t cmd;
                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION)
                                 cmd = BR_CLEAR_DEATH_NOTIFICATION_DONE;
                         else
                                 cmd = BR_DEAD_BINDER;
                         if (put_user(cmd, (uint32_t __user *)ptr))
                                 return -EFAULT;
                         ptr += sizeof(uint32_t);
                         if (put_user(death->cookie, (void * __user *)ptr))
                                 return -EFAULT;
                         ptr += sizeof(void *);
                         if (binder_debug_mask & BINDER_DEBUG_DEATH_NOTIFICATION)
                                 printk(KERN_INFO "binder: %d:%d %s %p/n",
                                        proc->pid, thread->pid,
                                        cmd == BR_DEAD_BINDER ?
                                        "BR_DEAD_BINDER" :
                                        "BR_CLEAR_DEATH_NOTIFICATION_DONE",
                                        death->cookie);
 
                         if (w->type == BINDER_WORK_CLEAR_DEATH_NOTIFICATION) {
                                 list_del(&w->entry);
                                 kfree(death);
                                 binder_stats.obj_deleted[BINDER_STAT_DEATH]++;
                         } else
                                 list_move(&w->entry, &proc->delivered_death);
                         if (cmd == BR_DEAD_BINDER)
                                 goto done; /* DEAD_BINDER notifications can cause transactions */
                 } break;
                 }
 
                 if (!t)
                         continue;
 
                 BUG_ON(t->buffer == NULL);
                 if (t->buffer->target_node) {
                         struct binder_node *target_node = t->buffer->target_node;
                         tr.target.ptr = target_node->ptr;
                         tr.cookie =  target_node->cookie;
                         t->saved_priority = task_nice(current);
                         if (t->priority < target_node->min_priority &&
                             !(t->flags & TF_ONE_WAY))
                                 binder_set_nice(t->priority);
                         else if (!(t->flags & TF_ONE_WAY) ||
                                  t->saved_priority > target_node->min_priority)
                                 binder_set_nice(target_node->min_priority);
                         cmd = BR_TRANSACTION;
                 } else {
                         tr.target.ptr = NULL;
                         tr.cookie = NULL;
                         cmd = BR_REPLY;
                 }
                 tr.code = t->code;
                 tr.flags = t->flags;
                 tr.sender_euid = t->sender_euid;
 
                 if (t->from) {
                         struct task_struct *sender = t->from->proc->tsk;
                         tr.sender_pid = task_tgid_nr_ns(sender, current->nsproxy->pid_ns);
                 } else {
                         tr.sender_pid = 0;
                 }
 
                 tr.data_size = t->buffer->data_size;
                 tr.offsets_size = t->buffer->offsets_size;
                 tr.data.ptr.buffer = (void *)((void *)t->buffer->data + proc->user_buffer_offset);
                 tr.data.ptr.offsets = tr.data.ptr.buffer + ALIGN(t->buffer->data_size, sizeof(void *));
 
                 if (put_user(cmd, (uint32_t __user *)ptr))
                         return -EFAULT;
                 ptr += sizeof(uint32_t);
                 if (copy_to_user(ptr, &tr, sizeof(tr)))
                         return -EFAULT;
                 ptr += sizeof(tr);
 
                 binder_stat_br(proc, thread, cmd);
                 if (binder_debug_mask & BINDER_DEBUG_TRANSACTION)
                         printk(KERN_INFO "binder: %d:%d %s %d %d:%d, cmd %d size %d-%d ptr %p-%p/n",
                                proc->pid, thread->pid,
                                (cmd == BR_TRANSACTION) ? "BR_TRANSACTION" : "BR_REPLY",
                                t->debug_id, t->from ? t->from->proc->pid : 0,
                                t->from ? t->from->pid : 0, cmd,
                                t->buffer->data_size, t->buffer->offsets_size,
                                tr.data.ptr.buffer, tr.data.ptr.offsets);
 
                 list_del(&t->work.entry);
                 t->buffer->allow_user_free = 1;
                 if (cmd == BR_TRANSACTION && !(t->flags & TF_ONE_WAY)) {
                         t->to_parent = thread->transaction_stack;
                         t->to_thread = thread;
                         thread->transaction_stack = t;
                 } else {
                         t->buffer->transaction = NULL;
                         kfree(t);
                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION]++;
                 }
                 break;
         }
 
 done:
 
         *consumed = ptr - buffer;
         if (proc->requested_threads + proc->ready_threads == 0 &&
             proc->requested_threads_started < proc->max_threads &&
             (thread->looper & (BINDER_LOOPER_STATE_REGISTERED |
              BINDER_LOOPER_STATE_ENTERED)) /* the user-space code fails to */
              /*spawn a new thread if we leave this out */) {
                 proc->requested_threads++;
                 if (binder_debug_mask & BINDER_DEBUG_THREADS)
                         printk(KERN_INFO "binder: %d:%d BR_SPAWN_LOOPER/n",
                                proc->pid, thread->pid);
                 if (put_user(BR_SPAWN_LOOPER, (uint32_t __user *)buffer))
                         return -EFAULT;
         }
         return 0;
 }
 
 static void binder_release_work(struct list_head *list)
 {
         struct binder_work *w;
         while (!list_empty(list)) {
                 w = list_first_entry(list, struct binder_work, entry);
                 list_del_init(&w->entry);
                 switch (w->type) {
                 case BINDER_WORK_TRANSACTION: {
                         struct binder_transaction *t = container_of(w, struct binder_transaction, work);
                         if (t->buffer->target_node && !(t->flags & TF_ONE_WAY))
                                 binder_send_failed_reply(t, BR_DEAD_REPLY);
                 } break;
                 case BINDER_WORK_TRANSACTION_COMPLETE: {
                         kfree(w);
                         binder_stats.obj_deleted[BINDER_STAT_TRANSACTION_COMPLETE]++;
                 } break;
                 default:
                         break;
                 }
         }
 
 }
 
 static struct binder_thread *binder_get_thread(struct binder_proc *proc)
 {
         struct binder_thread *thread = NULL;
         struct rb_node *parent = NULL;
         struct rb_node **p = &proc->threads.rb_node;
 
         while (*p) {
                 parent = *p;
                 thread = rb_entry(parent, struct binder_thread, rb_node);
 
                 if (current->pid < thread->pid)
                         p = &(*p)->rb_left;
                 else if (current->pid > thread->pid)
                         p = &(*p)->rb_right;
                 else
                         break;
         }
         if (*p == NULL) {
                 thread = kzalloc(sizeof(*thread), GFP_KERNEL);
                 if (thread == NULL)
                         return NULL;
                 binder_stats.obj_created[BINDER_STAT_THREAD]++;
                 thread->proc = proc;
                 thread->pid = current->pid;
                 init_waitqueue_head(&thread->wait);
                 INIT_LIST_HEAD(&thread->todo);
                 rb_link_node(&thread->rb_node, parent, p);
                 rb_insert_color(&thread->rb_node, &proc->threads);
                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
                 thread->return_error = BR_OK;
                 thread->return_error2 = BR_OK;
         }
         return thread;
 }
 
 static int binder_free_thread(struct binder_proc *proc, struct binder_thread *thread)
 {
         struct binder_transaction *t;
         struct binder_transaction *send_reply = NULL;
         int active_transactions = 0;
 
         rb_erase(&thread->rb_node, &proc->threads);
         t = thread->transaction_stack;
         if (t && t->to_thread == thread)
                 send_reply = t;
         while (t) {
                 active_transactions++;
                 if (binder_debug_mask & BINDER_DEBUG_DEAD_TRANSACTION)
                         printk(KERN_INFO "binder: release %d:%d transaction %d %s, still active/n",
                                proc->pid, thread->pid, t->debug_id, (t->to_thread == thread) ? "in" : "out");
                 if (t->to_thread == thread) {
                         t->to_proc = NULL;
                         t->to_thread = NULL;
                         if (t->buffer) {
                                 t->buffer->transaction = NULL;
                                 t->buffer = NULL;
                         }
                         t = t->to_parent;
                 } else if (t->from == thread) {
                         t->from = NULL;
                         t = t->from_parent;
                 } else
                         BUG();
         }
         if (send_reply)
                 binder_send_failed_reply(send_reply, BR_DEAD_REPLY);
         binder_release_work(&thread->todo);
         kfree(thread);
         binder_stats.obj_deleted[BINDER_STAT_THREAD]++;
         return active_transactions;
 }
 
 static unsigned int binder_poll(struct file *filp, struct poll_table_struct *wait)
 {
         struct binder_proc *proc = filp->private_data;
         struct binder_thread *thread = NULL;
         int wait_for_proc_work;
 
         mutex_lock(&binder_lock);
         thread = binder_get_thread(proc);
 
         wait_for_proc_work = thread->transaction_stack == NULL &&
                 list_empty(&thread->todo) && thread->return_error == BR_OK;
         mutex_unlock(&binder_lock);
 
         if (wait_for_proc_work) {
                 if (binder_has_proc_work(proc, thread))
                         return POLLIN;
                 poll_wait(filp, &proc->wait, wait);
                 if (binder_has_proc_work(proc, thread))
                         return POLLIN;
         } else {
                 if (binder_has_thread_work(thread))
                         return POLLIN;
                 poll_wait(filp, &thread->wait, wait);
                 if (binder_has_thread_work(thread))
                         return POLLIN;
         }
         return 0;
 }
 
 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
         int ret;
         struct binder_proc *proc = filp->private_data;
         struct binder_thread *thread;
         unsigned int size = _IOC_SIZE(cmd);
         void __user *ubuf = (void __user *)arg;
 
         /*printk(KERN_INFO "binder_ioctl: %d:%d %x %lx/n", proc->pid, current->pid, cmd, arg);*/
 
         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
         if (ret)
                 return ret;
 
         mutex_lock(&binder_lock);
         thread = binder_get_thread(proc);
         if (thread == NULL) {
                 ret = -ENOMEM;
                 goto err;
         }
 
         switch (cmd) {
         case BINDER_WRITE_READ: {
                 struct binder_write_read bwr;
                 if (size != sizeof(struct binder_write_read)) {
                         ret = -EINVAL;
                         goto err;
                 }
                 if (copy_from_user(&bwr, ubuf, sizeof(bwr))) {
                         ret = -EFAULT;
                         goto err;
                 }
                 if (binder_debug_mask & BINDER_DEBUG_READ_WRITE)
                         printk(KERN_INFO "binder: %d:%d write %ld at %08lx, read %ld at %08lx/n",
                                proc->pid, thread->pid, bwr.write_size, bwr.write_buffer, bwr.read_size, bwr.read_buffer);
                 if (bwr.write_size > 0) {
                         ret = binder_thread_write(proc, thread, (void __user *)bwr.write_buffer, bwr.write_size, &bwr.write_consumed);
                         if (ret < 0) {
                                 bwr.read_consumed = 0;
                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
                                         ret = -EFAULT;
                                 goto err;
                         }
                 }
                 if (bwr.read_size > 0) {
                         ret = binder_thread_read(proc, thread, (void __user *)bwr.read_buffer, bwr.read_size, &bwr.read_consumed, filp->f_flags & O_NONBLOCK);
                         if (!list_empty(&proc->todo))
                                 wake_up_interruptible(&proc->wait);
                         if (ret < 0) {
                                 if (copy_to_user(ubuf, &bwr, sizeof(bwr)))
                                         ret = -EFAULT;
                                 goto err;
                         }
                 }
                 if (binder_debug_mask & BINDER_DEBUG_READ_WRITE)
                         printk(KERN_INFO "binder: %d:%d wrote %ld of %ld, read return %ld of %ld/n",
                                proc->pid, thread->pid, bwr.write_consumed, bwr.write_size, bwr.read_consumed, bwr.read_size);
                 if (copy_to_user(ubuf, &bwr, sizeof(bwr))) {
                         ret = -EFAULT;
                         goto err;
                 }
                 break;
         }
         case BINDER_SET_MAX_THREADS:
                 if (copy_from_user(&proc->max_threads, ubuf, sizeof(proc->max_threads))) {
                         ret = -EINVAL;
                         goto err;
                 }
                 break;
         case BINDER_SET_CONTEXT_MGR:
                 if (binder_context_mgr_node != NULL) {
                         printk(KERN_ERR "binder: BINDER_SET_CONTEXT_MGR already set/n");
                         ret = -EBUSY;
                         goto err;
                 }
                 if (binder_context_mgr_uid != -1) {
                         if (binder_context_mgr_uid != current_euid()) {
                                 printk(KERN_ERR "binder: BINDER_SET_"
                                        "CONTEXT_MGR bad uid %d != %d/n",
                                        current_euid(),
                                        binder_context_mgr_uid);
                                 ret = -EPERM;
                                 goto err;
                         }
                 } else
                         binder_context_mgr_uid = current_euid();
                 binder_context_mgr_node = binder_new_node(proc, NULL, NULL);
                 if (binder_context_mgr_node == NULL) {
                         ret = -ENOMEM;
                         goto err;
                 }
                 binder_context_mgr_node->local_weak_refs++;
                 binder_context_mgr_node->local_strong_refs++;
                 binder_context_mgr_node->has_strong_ref = 1;
                 binder_context_mgr_node->has_weak_ref = 1;
                 break;
         case BINDER_THREAD_EXIT:
                 if (binder_debug_mask & BINDER_DEBUG_THREADS)
                         printk(KERN_INFO "binder: %d:%d exit/n",
                                proc->pid, thread->pid);
                 binder_free_thread(proc, thread);
                 thread = NULL;
                 break;
         case BINDER_VERSION:
                 if (size != sizeof(struct binder_version)) {
                         ret = -EINVAL;
                         goto err;
                 }
                 if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct binder_version *)ubuf)->protocol_version)) {
                         ret = -EINVAL;
                         goto err;
                 }
                 break;
         default:
                 ret = -EINVAL;
                 goto err;
         }
         ret = 0;
 err:
         if (thread)
                 thread->looper &= ~BINDER_LOOPER_STATE_NEED_RETURN;
         mutex_unlock(&binder_lock);
         wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
         if (ret && ret != -ERESTARTSYS)
                 printk(KERN_INFO "binder: %d:%d ioctl %x %lx returned %d/n", proc->pid, current->pid, cmd, arg, ret);
         return ret;
 }
 
 static void binder_vma_open(struct vm_area_struct *vma)
 {
         struct binder_proc *proc = vma->vm_private_data;
         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
                 printk(KERN_INFO "binder: %d open vm area %lx-%lx (%ld K) vma %lx pagep %lx/n", proc->pid, vma->vm_start, vma->vm_end, (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, vma->vm_page_prot);
         dump_stack();
 }
 static void binder_vma_close(struct vm_area_struct *vma)
 {
         struct binder_proc *proc = vma->vm_private_data;
         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
                 printk(KERN_INFO "binder: %d close vm area %lx-%lx (%ld K) vma %lx pagep %lx/n", proc->pid, vma->vm_start, vma->vm_end, (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, vma->vm_page_prot);
         proc->vma = NULL;
 }
 
 static struct vm_operations_struct binder_vm_ops = {
         .open = binder_vma_open,
         .close = binder_vma_close,
 };
 
 static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
 {
         int ret;
         struct vm_struct *area;
         struct binder_proc *proc = filp->private_data;
         const char *failure_string;
         struct binder_buffer *buffer;
 
         if ((vma->vm_end - vma->vm_start) > SZ_4M)
                 vma->vm_end = vma->vm_start + SZ_4M;
 
         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
                 printk(KERN_INFO "binder_mmap: %d %lx-%lx (%ld K) vma %lx pagep %lx/n", proc->pid, vma->vm_start, vma->vm_end, (vma->vm_end - vma->vm_start) / SZ_1K, vma->vm_flags, vma->vm_page_prot);
 
         if (vma->vm_flags & FORBIDDEN_MMAP_FLAGS) {
                 ret = -EPERM;
                 failure_string = "bad vm_flags";
                 goto err_bad_arg;
         }
         vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
 
         area = get_vm_area(vma->vm_end - vma->vm_start, VM_IOREMAP);
         if (area == NULL) {
                 ret = -ENOMEM;
                 failure_string = "get_vm_area";
                 goto err_get_vm_area_failed;
         }
         proc->buffer = area->addr;
         proc->user_buffer_offset = vma->vm_start - (size_t)proc->buffer;
 
 #ifdef CONFIG_CPU_CACHE_VIPT
         if (cache_is_vipt_aliasing()) {
                 while (CACHE_COLOUR((vma->vm_start ^ (uint32_t)proc->buffer))) {
                         printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p bad alignment/n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);
                         vma->vm_start += PAGE_SIZE;
                 }
         }
 #endif
         proc->pages = kzalloc(sizeof(proc->pages[0]) * ((vma->vm_end - vma->vm_start) / PAGE_SIZE), GFP_KERNEL);
         if (proc->pages == NULL) {
                 ret = -ENOMEM;
                 failure_string = "alloc page array";
                 goto err_alloc_pages_failed;
         }
         proc->buffer_size = vma->vm_end - vma->vm_start;
 
         vma->vm_ops = &binder_vm_ops;
         vma->vm_private_data = proc;
 
         if (binder_update_page_range(proc, 1, proc->buffer, proc->buffer + PAGE_SIZE, vma)) {
                 ret = -ENOMEM;
                 failure_string = "alloc small buf";
                 goto err_alloc_small_buf_failed;
         }
         buffer = proc->buffer;
         INIT_LIST_HEAD(&proc->buffers);
         list_add(&buffer->entry, &proc->buffers);
         buffer->free = 1;
         binder_insert_free_buffer(proc, buffer);
         proc->free_async_space = proc->buffer_size / 2;
         barrier();
         proc->vma = vma;
 
         /*printk(KERN_INFO "binder_mmap: %d %lx-%lx maps %p/n", proc->pid, vma->vm_start, vma->vm_end, proc->buffer);*/
         return 0;
 
 err_alloc_small_buf_failed:
         kfree(proc->pages);
 err_alloc_pages_failed:
         vfree(proc->buffer);
 err_get_vm_area_failed:
         mutex_unlock(&binder_lock);
 err_bad_arg:
         printk(KERN_ERR "binder_mmap: %d %lx-%lx %s failed %d/n", proc->pid, vma->vm_start, vma->vm_end, failure_string, ret);
         return ret;
 }
 
 static int binder_open(struct inode *nodp, struct file *filp)
 {
         struct binder_proc *proc;
 
         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
                 printk(KERN_INFO "binder_open: %d:%d/n", current->group_leader->pid, current->pid);
 
         proc = kzalloc(sizeof(*proc), GFP_KERNEL);
         if (proc == NULL)
                 return -ENOMEM;
         get_task_struct(current);
         proc->tsk = current;
         INIT_LIST_HEAD(&proc->todo);
         init_waitqueue_head(&proc->wait);
         proc->default_priority = task_nice(current);
         mutex_lock(&binder_lock);
         binder_stats.obj_created[BINDER_STAT_PROC]++;
         hlist_add_head(&proc->proc_node, &binder_procs);
         proc->pid = current->group_leader->pid;
         INIT_LIST_HEAD(&proc->delivered_death);
         filp->private_data = proc;
         mutex_unlock(&binder_lock);
 
         if (binder_proc_dir_entry_proc) {
                 char strbuf[11];
                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
                 create_proc_read_entry(strbuf, S_IRUGO, binder_proc_dir_entry_proc, binder_read_proc_proc, proc);
         }
 
         return 0;
 }
 
 static int binder_flush(struct file *filp, fl_owner_t id)
 {
         struct rb_node *n;
         struct binder_proc *proc = filp->private_data;
         int wake_count = 0;
 
         mutex_lock(&binder_lock);
         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n)) {
                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
                 thread->looper |= BINDER_LOOPER_STATE_NEED_RETURN;
                 if (thread->looper & BINDER_LOOPER_STATE_WAITING) {
                         wake_up_interruptible(&thread->wait);
                         wake_count++;
                 }
         }
         wake_up_interruptible_all(&proc->wait);
         mutex_unlock(&binder_lock);
 
         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
                 printk(KERN_INFO "binder_flush: %d woke %d threads/n", proc->pid, wake_count);
 
         return 0;
 }
 
 static int binder_release(struct inode *nodp, struct file *filp)
 {
         struct hlist_node *pos;
         struct binder_transaction *t;
         struct rb_node *n;
         struct binder_proc *proc = filp->private_data;
         int threads, nodes, incoming_refs, outgoing_refs, buffers, active_transactions, page_count;
 
         if (binder_proc_dir_entry_proc) {
                 char strbuf[11];
                 snprintf(strbuf, sizeof(strbuf), "%u", proc->pid);
                 remove_proc_entry(strbuf, binder_proc_dir_entry_proc);
         }
         mutex_lock(&binder_lock);
         hlist_del(&proc->proc_node);
         if (binder_context_mgr_node && binder_context_mgr_node->proc == proc) {
                 if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
                         printk(KERN_INFO "binder_release: %d context_mgr_node gone/n", proc->pid);
                 binder_context_mgr_node = NULL;
         }
 
         threads = 0;
         active_transactions = 0;
         while ((n = rb_first(&proc->threads))) {
                 struct binder_thread *thread = rb_entry(n, struct binder_thread, rb_node);
                 threads++;
                 active_transactions += binder_free_thread(proc, thread);
         }
         nodes = 0;
         incoming_refs = 0;
         while ((n = rb_first(&proc->nodes))) {
                 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
 
                 nodes++;
                 rb_erase(&node->rb_node, &proc->nodes);
                 list_del_init(&node->work.entry);
                 if (hlist_empty(&node->refs)) {
                         kfree(node);
                         binder_stats.obj_deleted[BINDER_STAT_NODE]++;
                 } else {
                         struct binder_ref *ref;
                         int death = 0;
 
                         node->proc = NULL;
                         node->local_strong_refs = 0;
                         node->local_weak_refs = 0;
                         hlist_add_head(&node->dead_node, &binder_dead_nodes);
 
                         hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
                                 incoming_refs++;
                                 if (ref->death) {
                                         death++;
                                         if (list_empty(&ref->death->work.entry)) {
                                                 ref->death->work.type = BINDER_WORK_DEAD_BINDER;
                                                 list_add_tail(&ref->death->work.entry, &ref->proc->todo);
                                                 wake_up_interruptible(&ref->proc->wait);
                                         } else
                                                 BUG();
                                 }
                         }
                         if (binder_debug_mask & BINDER_DEBUG_DEAD_BINDER)
                                 printk(KERN_INFO "binder: node %d now dead, refs %d, death %d/n", node->debug_id, incoming_refs, death);
                 }
         }
         outgoing_refs = 0;
         while ((n = rb_first(&proc->refs_by_desc))) {
                 struct binder_ref *ref = rb_entry(n, struct binder_ref, rb_node_desc);
                 outgoing_refs++;
                 binder_delete_ref(ref);
         }
         binder_release_work(&proc->todo);
         buffers = 0;
 
         while ((n = rb_first(&proc->allocated_buffers))) {
                 struct binder_buffer *buffer = rb_entry(n, struct binder_buffer, rb_node);
                 t = buffer->transaction;
                 if (t) {
                         t->buffer = NULL;
                         buffer->transaction = NULL;
                         printk(KERN_ERR "binder: release proc %d, transaction %d, not freed/n", proc->pid, t->debug_id);
                         /*BUG();*/
                 }
                 binder_free_buf(proc, buffer);
                 buffers++;
         }
 
         binder_stats.obj_deleted[BINDER_STAT_PROC]++;
         mutex_unlock(&binder_lock);
 
         page_count = 0;
         if (proc->pages) {
                 int i;
                 for (i = 0; i < proc->buffer_size / PAGE_SIZE; i++) {
                         if (proc->pages[i]) {
                                 if (binder_debug_mask & BINDER_DEBUG_BUFFER_ALLOC)
                                         printk(KERN_INFO "binder_release: %d: page %d at %p not freed/n", proc->pid, i, proc->buffer + i * PAGE_SIZE);
                                 __free_page(proc->pages[i]);
                                 page_count++;
                         }
                 }
                 kfree(proc->pages);
                 vfree(proc->buffer);
         }
 
         put_task_struct(proc->tsk);
 
         if (binder_debug_mask & BINDER_DEBUG_OPEN_CLOSE)
                 printk(KERN_INFO "binder_release: %d threads %d, nodes %d (ref %d), refs %d, active transactions %d, buffers %d, pages %d/n",
                        proc->pid, threads, nodes, incoming_refs, outgoing_refs, active_transactions, buffers, page_count);
 
         kfree(proc);
         return 0;
 }
 
 static char *print_binder_transaction(char *buf, char *end, const char *prefix, struct binder_transaction *t)
 {
         buf += snprintf(buf, end - buf, "%s %d: %p from %d:%d to %d:%d code %x flags %x pri %ld r%d",
                         prefix, t->debug_id, t, t->from ? t->from->proc->pid : 0,
                         t->from ? t->from->pid : 0,
                         t->to_proc ? t->to_proc->pid : 0,
                         t->to_thread ? t->to_thread->pid : 0,
                         t->code, t->flags, t->priority, t->need_reply);
         if (buf >= end)
                 return buf;
         if (t->buffer == NULL) {
                 buf += snprintf(buf, end - buf, " buffer free/n");
                 return buf;
         }
         if (t->buffer->target_node) {
                 buf += snprintf(buf, end - buf, " node %d",
                                 t->buffer->target_node->debug_id);
                 if (buf >= end)
                         return buf;
         }
         buf += snprintf(buf, end - buf, " size %d:%d data %p/n",
                         t->buffer->data_size, t->buffer->offsets_size,
                         t->buffer->data);
         return buf;
 }
 
 static char *print_binder_buffer(char *buf, char *end, const char *prefix, struct binder_buffer *buffer)
 {
         buf += snprintf(buf, end - buf, "%s %d: %p size %d:%d %s/n",
                         prefix, buffer->debug_id, buffer->data,
                         buffer->data_size, buffer->offsets_size,
                         buffer->transaction ? "active" : "delivered");
         return buf;
 }
 
 static char *print_binder_work(char *buf, char *end, const char *prefix,
         const char *transaction_prefix, struct binder_work *w)
 {
         struct binder_node *node;
         struct binder_transaction *t;
 
         switch (w->type) {
         case BINDER_WORK_TRANSACTION:
                 t = container_of(w, struct binder_transaction, work);
                 buf = print_binder_transaction(buf, end, transaction_prefix, t);
                 break;
         case BINDER_WORK_TRANSACTION_COMPLETE:
                 buf += snprintf(buf, end - buf,
                                 "%stransaction complete/n", prefix);
                 break;
         case BINDER_WORK_NODE:
                 node = container_of(w, struct binder_node, work);
                 buf += snprintf(buf, end - buf, "%snode work %d: u%p c%p/n",
                                 prefix, node->debug_id, node->ptr, node->cookie);
                 break;
         case BINDER_WORK_DEAD_BINDER:
                 buf += snprintf(buf, end - buf, "%shas dead binder/n", prefix);
                 break;
         case BINDER_WORK_DEAD_BINDER_AND_CLEAR:
                 buf += snprintf(buf, end - buf,
                                 "%shas cleared dead binder/n", prefix);
                 break;
         case BINDER_WORK_CLEAR_DEATH_NOTIFICATION:
                 buf += snprintf(buf, end - buf,
                                 "%shas cleared death notification/n", prefix);
                 break;
         default:
                 buf += snprintf(buf, end - buf, "%sunknown work: type %d/n",
                                 prefix, w->type);
                 break;
         }
         return buf;
 }
 
 static char *print_binder_thread(char *buf, char *end, struct binder_thread *thread, int print_always)
 {
         struct binder_transaction *t;
         struct binder_work *w;
         char *start_buf = buf;
         char *header_buf;
 
         buf += snprintf(buf, end - buf, "  thread %d: l %02x/n", thread->pid, thread->looper);
         header_buf = buf;
         t = thread->transaction_stack;
         while (t) {
                 if (buf >= end)
                         break;
                 if (t->from == thread) {
                         buf = print_binder_transaction(buf, end, "    outgoing transaction", t);
                         t = t->from_parent;
                 } else if (t->to_thread == thread) {
                         buf = print_binder_transaction(buf, end, "    incoming transaction", t);
                         t = t->to_parent;
                 } else {
                         buf = print_binder_transaction(buf, end, "    bad transaction", t);
                         t = NULL;
                 }
         }
         list_for_each_entry(w, &thread->todo, entry) {
                 if (buf >= end)
                         break;
                 buf = print_binder_work(buf, end, "    ",
                                         "    pending transaction", w);
         }
         if (!print_always && buf == header_buf)
                 buf = start_buf;
         return buf;
 }
 
 static char *print_binder_node(char *buf, char *end, struct binder_node *node)
 {
         struct binder_ref *ref;
         struct hlist_node *pos;
         struct binder_work *w;
         int count;
         count = 0;
         hlist_for_each_entry(ref, pos, &node->refs, node_entry)
                 count++;
 
         buf += snprintf(buf, end - buf, "  node %d: u%p c%p hs %d hw %d ls %d lw %d is %d iw %d",
                         node->debug_id, node->ptr, node->cookie,
                         node->has_strong_ref, node->has_weak_ref,
                         node->local_strong_refs, node->local_weak_refs,
                         node->internal_strong_refs, count);
         if (buf >= end)
                 return buf;
         if (count) {
                 buf += snprintf(buf, end - buf, " proc");
                 if (buf >= end)
                         return buf;
                 hlist_for_each_entry(ref, pos, &node->refs, node_entry) {
                         buf += snprintf(buf, end - buf, " %d", ref->proc->pid);
                         if (buf >= end)
                                 return buf;
                 }
         }
         buf += snprintf(buf, end - buf, "/n");
         list_for_each_entry(w, &node->async_todo, entry) {
                 if (buf >= end)
                         break;
                 buf = print_binder_work(buf, end, "    ",
                                         "    pending async transaction", w);
         }
         return buf;
 }
 
 static char *print_binder_ref(char *buf, char *end, struct binder_ref *ref)
 {
         buf += snprintf(buf, end - buf, "  ref %d: desc %d %snode %d s %d w %d d %p/n",
                         ref->debug_id, ref->desc, ref->node->proc ? "" : "dead ",
                         ref->node->debug_id, ref->strong, ref->weak, ref->death);
         return buf;
 }
 
 static char *print_binder_proc(char *buf, char *end, struct binder_proc *proc, int print_all)
 {
         struct binder_work *w;
         struct rb_node *n;
         char *start_buf = buf;
         char *header_buf;
 
         buf += snprintf(buf, end - buf, "proc %d/n", proc->pid);
         header_buf = buf;
 
         for (n = rb_first(&proc->threads); n != NULL && buf < end; n = rb_next(n))
                 buf = print_binder_thread(buf, end, rb_entry(n, struct binder_thread, rb_node), print_all);
         for (n = rb_first(&proc->nodes); n != NULL && buf < end; n = rb_next(n)) {
                 struct binder_node *node = rb_entry(n, struct binder_node, rb_node);
                 if (print_all || node->has_async_transaction)
                         buf = print_binder_node(buf, end, node);
         }
         if (print_all) {
                 for (n = rb_first(&proc->refs_by_desc); n != NULL && buf < end; n = rb_next(n))
                         buf = print_binder_ref(buf, end, rb_entry(n, struct binder_ref, rb_node_desc));
         }
         for (n = rb_first(&proc->allocated_buffers); n != NULL && buf < end; n = rb_next(n))
                 buf = print_binder_buffer(buf, end, "  buffer", rb_entry(n, struct binder_buffer, rb_node));
         list_for_each_entry(w, &proc->todo, entry) {
                 if (buf >= end)
                         break;
                 buf = print_binder_work(buf, end, "  ",
                                         "  pending transaction", w);
         }
         list_for_each_entry(w, &proc->delivered_death, entry) {
                 if (buf >= end)
                         break;
                 buf += snprintf(buf, end - buf, "  has delivered dead binder/n");
                 break;
         }
         if (!print_all && buf == header_buf)
                 buf = start_buf;
         return buf;
 }
 
 static const char *binder_return_strings[] = {
         "BR_ERROR",
         "BR_OK",
         "BR_TRANSACTION",
         "BR_REPLY",
         "BR_ACQUIRE_RESULT",
         "BR_DEAD_REPLY",
         "BR_TRANSACTION_COMPLETE",
         "BR_INCREFS",
         "BR_ACQUIRE",
         "BR_RELEASE",
         "BR_DECREFS",
         "BR_ATTEMPT_ACQUIRE",
         "BR_NOOP",
         "BR_SPAWN_LOOPER",
         "BR_FINISHED",
         "BR_DEAD_BINDER",
         "BR_CLEAR_DEATH_NOTIFICATION_DONE",
         "BR_FAILED_REPLY"
 };
 
 static const char *binder_command_strings[] = {
         "BC_TRANSACTION",
         "BC_REPLY",
         "BC_ACQUIRE_RESULT",
         "BC_FREE_BUFFER",
         "BC_INCREFS",
         "BC_ACQUIRE",
         "BC_RELEASE",
         "BC_DECREFS",
         "BC_INCREFS_DONE",
         "BC_ACQUIRE_DONE",
         "BC_ATTEMPT_ACQUIRE",
         "BC_REGISTER_LOOPER",
         "BC_ENTER_LOOPER",
         "BC_EXIT_LOOPER",
         "BC_REQUEST_DEATH_NOTIFICATION",
         "BC_CLEAR_DEATH_NOTIFICATION",
         "BC_DEAD_BINDER_DONE"
 };
 
 static const char *binder_objstat_strings[] = {
         "proc",
         "thread",
         "node",
         "ref",
         "death",
         "transaction",
         "transaction_complete"
 };
 
 static char *print_binder_stats(char *buf, char *end, const char *prefix, struct binder_stats *stats)
 {
         int i;
 
         BUILD_BUG_ON(ARRAY_SIZE(stats->bc) != ARRAY_SIZE(binder_command_strings));
         for (i = 0; i < ARRAY_SIZE(stats->bc); i++) {
                 if (stats->bc[i])
                         buf += snprintf(buf, end - buf, "%s%s: %d/n", prefix,
                                         binder_command_strings[i], stats->bc[i]);
                 if (buf >= end)
                         return buf;
         }
 
         BUILD_BUG_ON(ARRAY_SIZE(stats->br) != ARRAY_SIZE(binder_return_strings));
         for (i = 0; i < ARRAY_SIZE(stats->br); i++) {
                 if (stats->br[i])
                         buf += snprintf(buf, end - buf, "%s%s: %d/n", prefix,
                                         binder_return_strings[i], stats->br[i]);
                 if (buf >= end)
                         return buf;
         }
 
         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) != ARRAY_SIZE(binder_objstat_strings));
         BUILD_BUG_ON(ARRAY_SIZE(stats->obj_created) != ARRAY_SIZE(stats->obj_deleted));
         for (i = 0; i < ARRAY_SIZE(stats->obj_created); i++) {
                 if (stats->obj_created[i] || stats->obj_deleted[i])
                         buf += snprintf(buf, end - buf, "%s%s: active %d total %d/n", prefix,
                                         binder_objstat_strings[i],
                                         stats->obj_created[i] - stats->obj_deleted[i],
                                         stats->obj_created[i]);
                 if (buf >= end)
                         return buf;
         }
         return buf;
 }
 
 static char *print_binder_proc_stats(char *buf, char *end, struct binder_proc *proc)
 {
         struct binder_work *w;
         struct rb_node *n;
         int count, strong, weak;
 
         buf += snprintf(buf, end - buf, "proc %d/n", proc->pid);
         if (buf >= end)
                 return buf;
         count = 0;
         for (n = rb_first(&proc->threads); n != NULL; n = rb_next(n))
                 count++;
         buf += snprintf(buf, end - buf, "  threads: %d/n", count);
         if (buf >= end)
                 return buf;
         buf += snprintf(buf, end - buf, "  requested threads: %d+%d/%d/n"
                         "  ready threads %d/n"
                         "  free async space %d/n", proc->requested_threads,
                         proc->requested_threads_started, proc->max_threads,
                         proc->ready_threads, proc->free_async_space);
         if (buf >= end)
                 return buf;
         count = 0;
         for (n = rb_first(&proc->nodes); n != NULL; n = rb_next(n))
                 count++;
         buf += snprintf(buf, end - buf, "  nodes: %d/n", count);
         if (buf >= end)
                 return buf;
         count = 0;
         strong = 0;
         weak = 0;
         for (n = rb_first(&proc->refs_by_desc); n != NULL; n = rb_next(n)) {
                 struct binder_ref *ref = rb_entry(n, struct binder_ref, rb_node_desc);
                 count++;
                 strong += ref->strong;
                 weak += ref->weak;
         }
         buf += snprintf(buf, end - buf, "  refs: %d s %d w %d/n", count, strong, weak);
         if (buf >= end)
                 return buf;
 
         count = 0;
         for (n = rb_first(&proc->allocated_buffers); n != NULL; n = rb_next(n))
                 count++;
         buf += snprintf(buf, end - buf, "  buffers: %d/n", count);
         if (buf >= end)
                 return buf;
 
         count = 0;
         list_for_each_entry(w, &proc->todo, entry) {
                 switch (w->type) {
                 case BINDER_WORK_TRANSACTION:
                         count++;
                         break;
                 default:
                         break;
                 }
         }
         buf += snprintf(buf, end - buf, "  pending transactions: %d/n", count);
         if (buf >= end)
                 return buf;
 
         buf = print_binder_stats(buf, end, "  ", &proc->stats);
 
         return buf;
 }
 
 
 static int binder_read_proc_state(
         char *page, char **start, off_t off, int count, int *eof, void *data)
 {
         struct binder_proc *proc;
         struct hlist_node *pos;
         struct binder_node *node;
         int len = 0;
         char *buf = page;
         char *end = page + PAGE_SIZE;
         int do_lock = !binder_debug_no_lock;
 
         if (off)
                 return 0;
 
         if (do_lock)
                 mutex_lock(&binder_lock);
 
         buf += snprintf(buf, end - buf, "binder state:/n");
 
         if (!hlist_empty(&binder_dead_nodes))
                 buf += snprintf(buf, end - buf, "dead nodes:/n");
         hlist_for_each_entry(node, pos, &binder_dead_nodes, dead_node) {
                 if (buf >= end)
                         break;
                 buf = print_binder_node(buf, end, node);
         }
 
         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
                 if (buf >= end)
                         break;
                 buf = print_binder_proc(buf, end, proc, 1);
         }
         if (do_lock)
                 mutex_unlock(&binder_lock);
         if (buf > page + PAGE_SIZE)
                 buf = page + PAGE_SIZE;
 
         *start = page + off;
 
         len = buf - page;
         if (len > off)
                 len -= off;
         else
                 len = 0;
 
         return len < count ? len  : count;
 }
 
 static int binder_read_proc_stats(
         char *page, char **start, off_t off, int count, int *eof, void *data)
 {
         struct binder_proc *proc;
         struct hlist_node *pos;
         int len = 0;
         char *p = page;
         int do_lock = !binder_debug_no_lock;
 
         if (off)
                 return 0;
 
         if (do_lock)
                 mutex_lock(&binder_lock);
 
         p += snprintf(p, PAGE_SIZE, "binder stats:/n");
 
         p = print_binder_stats(p, page + PAGE_SIZE, "", &binder_stats);
 
         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
                 if (p >= page + PAGE_SIZE)
                         break;
                 p = print_binder_proc_stats(p, page + PAGE_SIZE, proc);
         }
         if (do_lock)
                 mutex_unlock(&binder_lock);
         if (p > page + PAGE_SIZE)
                 p = page + PAGE_SIZE;
 
         *start = page + off;
 
         len = p - page;
         if (len > off)
                 len -= off;
         else
                 len = 0;
 
         return len < count ? len  : count;
 }
 
 static int binder_read_proc_transactions(
         char *page, char **start, off_t off, int count, int *eof, void *data)
 {
         struct binder_proc *proc;
         struct hlist_node *pos;
         int len = 0;
         char *buf = page;
         char *end = page + PAGE_SIZE;
         int do_lock = !binder_debug_no_lock;
 
         if (off)
                 return 0;
 
         if (do_lock)
                 mutex_lock(&binder_lock);
 
         buf += snprintf(buf, end - buf, "binder transactions:/n");
         hlist_for_each_entry(proc, pos, &binder_procs, proc_node) {
                 if (buf >= end)
                         break;
                 buf = print_binder_proc(buf, end, proc, 0);
         }
         if (do_lock)
                 mutex_unlock(&binder_lock);
         if (buf > page + PAGE_SIZE)
                 buf = page + PAGE_SIZE;
 
         *start = page + off;
 
         len = buf - page;
         if (len > off)
                 len -= off;
         else
                 len = 0;
 
         return len < count ? len  : count;
 }
 
 static int binder_read_proc_proc(
         char *page, char **start, off_t off, int count, int *eof, void *data)
 {
         struct binder_proc *proc = data;
         int len = 0;
         char *p = page;
         int do_lock = !binder_debug_no_lock;
 
         if (off)
                 return 0;
 
         if (do_lock)
                 mutex_lock(&binder_lock);
         p += snprintf(p, PAGE_SIZE, "binder proc state:/n");
         p = print_binder_proc(p, page + PAGE_SIZE, proc, 1);
         if (do_lock)
                 mutex_unlock(&binder_lock);
 
         if (p > page + PAGE_SIZE)
                 p = page + PAGE_SIZE;
         *start = page + off;
 
         len = p - page;
         if (len > off)
                 len -= off;
         else
                 len = 0;
 
         return len < count ? len  : count;
 }
 
 static char *print_binder_transaction_log_entry(char *buf, char *end, struct binder_transaction_log_entry *e)
 {
         buf += snprintf(buf, end - buf, "%d: %s from %d:%d to %d:%d node %d handle %d size %d:%d/n",
                         e->debug_id, (e->call_type == 2) ? "reply" :
                         ((e->call_type == 1) ? "async" : "call "), e->from_proc,
                         e->from_thread, e->to_proc, e->to_thread, e->to_node,
                         e->target_handle, e->data_size, e->offsets_size);
         return buf;
 }
 
 static int binder_read_proc_transaction_log(
         char *page, char **start, off_t off, int count, int *eof, void *data)
 {
         struct binder_transaction_log *log = data;
         int len = 0;
         int i;
         char *buf = page;
         char *end = page + PAGE_SIZE;
 
         if (off)
                 return 0;
 
         if (log->full) {
                 for (i = log->next; i < ARRAY_SIZE(log->entry); i++) {
                         if (buf >= end)
                                 break;
                         buf = print_binder_transaction_log_entry(buf, end, &log->entry[i]);
                 }
         }
         for (i = 0; i < log->next; i++) {
                 if (buf >= end)
                         break;
                 buf = print_binder_transaction_log_entry(buf, end, &log->entry[i]);
         }
 
         *start = page + off;
 
         len = buf - page;
         if (len > off)
                 len -= off;
         else
                 len = 0;
 
         return len < count ? len  : count;
 }
 
 static struct file_operations binder_fops = {
         .owner = THIS_MODULE,
         .poll = binder_poll,
         .unlocked_ioctl = binder_ioctl,
         .mmap = binder_mmap,
         .open = binder_open,
         .flush = binder_flush,
         .release = binder_release,
 };
 
 static struct miscdevice binder_miscdev = {
         .minor = MISC_DYNAMIC_MINOR,
         .name = "binder",
         .fops = &binder_fops
 };
 
 static int __init binder_init(void)
 {
         int ret;
 
         binder_proc_dir_entry_root = proc_mkdir("binder", NULL);
         if (binder_proc_dir_entry_root)
                 binder_proc_dir_entry_proc = proc_mkdir("proc", binder_proc_dir_entry_root);
         ret = misc_register(&binder_miscdev);
         if (binder_proc_dir_entry_root) {
                 create_proc_read_entry("state", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_state, NULL);
                 create_proc_read_entry("stats", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_stats, NULL);
                 create_proc_read_entry("transactions", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_transactions, NULL);
                 create_proc_read_entry("transaction_log", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_transaction_log, &binder_transaction_log);
                 create_proc_read_entry("failed_transaction_log", S_IRUGO, binder_proc_dir_entry_root, binder_read_proc_transaction_log, &binder_transaction_log_failed);
         }
         return ret;
 }
 
 device_initcall(binder_init);
 
nder

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