ko驱动模块rmmod 后insmod 异常问题解决

insmod xxx.ko
ldo6: Failed to create debugfs directory
-->set voltage ret 0 min_uV=3300000, max_uV=3300000
-->***set xxx cvbs voltage to 3.0v
xxx_init()
nr 2
i2c i2c-2: Failed to register i2c client xxx at 0x44 (-16)
Failed to create i2c new device.
VIC = 3
Unable to handle kernel NULL pointer dereference at virtual address 00000004
pgd = ca29c000
[00000004] *pgd=4a273831, *pte=00000000, *ppte=00000000
Internal error: Oops: 817 [#1] THUMB2
Modules linked in: xxx(+) esp8089 mac80211 hostap rfkill_regulator af_key af_packet lib80211 cfg80211 xfrm_ipcomp xfrm_user xfrm_algo tcp_htcp tcp_westwood tcp_cubic tcp_bic tcp_diag inet_diag xfrm4_mode_tunnel xfrm4_mode_transport xfrm4_mode_beet arptable_filter arpt_mangle arp_tables nf_defrag_ipv4 xt_mark cls_u32 act_gact tun libphy mii ansi_cprng hx280enc_265 hx280enc_h1 vdec_g1 Felix(O) [last unloaded: xxx]
CPU: 0 PID: 857 Comm: insmod Tainted: G        W  O 3.10.0-InfoTMIC #1
task: ca27c6c0 ti: c97aa000 task.ti: c97aa000
pc : [<bf94e072>]    lr : [<bf94e073>]    psr: 60000033
sp : c97abe38  ip : 00000033  fp : c052b340
r10: c97aa000  r9 : bf94e001  r8 : c97aa000
r7 : 00000000  r6 : bf94cb68  r5 : 00000001  r4 : bf94cc98
r3 : 00000000  r2 : c0500a4c  r1 : 00000000  r0 : 00000007
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA Thumb  Segment user
Control: 50c53c7d  Table: 4a29c059  DAC: 00000015

SP: 0xc97abdb8:
bdb8  c001990e 60000033 00000000 00000000 00000000 00000000 c0533c70 bf94e072
bdd8  60000033 ffffffff c97abe24 c97aa000 bf94e001 c000c475 00000007 00000000
bdf8  c0500a4c 00000000 bf94cc98 00000001 bf94cb68 00000000 c97aa000 bf94e001
be18  c97aa000 c052b340 00000033 c97abe38 bf94e073 bf94e072 60000033 ffffffff
be38  ca1d4000 00000000 bf94cbb0 00000000 00400100 bf94cb74 bf94cb68 bf94cc7c
be58  c97aa000 c000846f c0502fb4 c050e42c ffffffff 00000000 c0502fb4 c002d22d
be78  00000000 ca1c9700 00000000 00400100 bf94cb74 bf94cb68 bf94cc7c bf94cbb0