Kernel Driver错误返回值总结

Kernel常见错误类型总结

1) ENOMEM

dev->base = ioremap(mem->start, resource_size(mem));
 if (!dev->base) {
      r = -ENOMEM;
      goto err_free_mem;
 }

 

 dev = kzalloc(sizeof(struct omap_i2c_dev), GFP_KERNEL);
 if (!dev) {
  r = -ENOMEM;  /* 内存分配失败 */
  goto err_release_region;
 }

 

2) ERESTARTSYS

if (down_interruptible(&gDMA.lock) < 0) {
  return -ERESTARTSYS; /*  */
 }

 

3) EBUSY

 ioarea = request_mem_region(mem->start, resource_size(mem),
   pdev->name);
 if (!ioarea) {
  dev_err(&pdev->dev, "I2C region already claimed/n");
  return -EBUSY;  /*  内存已经被占用 */
 }

 

4) ENODEV

 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

 if (!irq) {
  dev_err(&pdev->dev, "no irq resource?/n");
  return -ENODEV;  /* 没有该设备 */
 }

 

5) EFAULT

if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
  return -EFAULT;

6) EAGAIN

if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
        vma->vm_end - vma->vm_start, vma->vm_page_prot))
  return -EAGAIN;

7) EINVAL

if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
  return -EINVAL;  /* 无效 */

 

Author: WoodPecker <[email protected]>