# insmod nunchuk/nunchuk.ko
[   34.271663] nunchuk: inside nunchuk_probe.
[   34.275993] nunchuk_probe(): nunchuk = 0xde5f6590, polled_input = 0xde54f940, input = 0xde534800
[   34.285944] input: Unspecified device as /devices/platform/ocp/4802a000.i2c/i2c-1/1-0052/input/input0
[   34.298493] nunchuk_probe(): just before exiting... input = 0xde534800
# rmmod nunchuk
[   45.220674] nunchuk: ENTERING remove()
[   45.224623] nunchuk_remove(): nunchuk = 0xde5f6590. nunchuk->polled_input = 0xde54f940. polled_input->input = 0x0
[   45.235425] nunchuk_remove(): global_input_dev = 0xde534800
[   45.241271] *** before input_unregister_polled_device()
[   45.246748] Unable to handle kernel NULL pointer dereference at virtual address 00000474
[   45.255222] pgd = de610000
[   45.258049] [00000474] *pgd=9e53b831, *pte=00000000, *ppte=00000000
[   45.264649] Internal error: Oops: 17 [#1] SMP ARM
[   45.269562] Modules linked in: nunchuk(O-)
[   45.283393] Hardware name: Generic AM33XX (Flattened Device Tree)
[   45.289754] task: de5d41c0 ti: de5ba000 task.ti: de5ba000
[   45.295401] PC is at input_unregister_device+0x8/0x74
[   45.300683] LR is at nunchuk_remove+0x7c/0xc0 [nunchuk]
[   45.306138] pc : [<c048c164>]    lr : [<bf00007c>]    psr: 60000013
[   45.306138] sp : de5bbf10  ip : 00000001  fp : 00000000
[   45.318121] r10: 00000000  r9 : de5ba000  r8 : c000f984
[   45.323573] r7 : 00000081  r6 : de516454  r5 : bf000000  r4 : 00000000
[   45.330386] r3 : 00000000  r2 : 00000000  r1 : 00000001  r0 : 00000000
[   45.337202] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
[   45.344651] Control: 10c5387d  Table: 9e610019  DAC: 00000051
[   45.350648] Process rmmod (pid: 104, stack limit = 0xde5ba218)
[   45.356736] Stack: (0xde5bbf10 to 0xde5bc000)
[   45.361287] bf00:                                     de54f940 bf00007c de516420 c0496384
[   45.369828] bf20: c0496338 de516420 bf00075c c03da280 bf00075c de516420 bf00075c c03da470
[   45.378369] bf40: bf00075c bef43b10 00000880 c03d9898 bf0007c0 c00c54b8 bef43aac 636e756e
[   45.386911] bf60: 006b7568 de5d4644 de5d41c0 c09dad8c 00000000 00000000 de5ba000 00000000
[   45.395453] bf80: bef43aac c005a480 0001e054 636e756e 006b7568 0000f8bc 0001e054 636e756e
[   45.403994] bfa0: 006b7568 c000f7e0 0001e054 636e756e bef43b10 00000880 bef43b10 00000880
[   45.412536] bfc0: 0001e054 636e756e 006b7568 00000081 000a5ad8 00000000 b6fd0000 00000000
[   45.421077] bfe0: bef43b08 bef43af8 0001df30 b6f37390 60000010 bef43b10 9fdf6861 9fdf6c61
[   45.429624] [<c048c164>] (input_unregister_device) from [<bf00007c>] (nunchuk_remove+0x7c/0xc0 [nunchuk])
[   45.439630] [<bf00007c>] (nunchuk_remove [nunchuk]) from [<c0496384>] (i2c_device_remove+0x4c/0x7c)
[   45.449090] [<c0496384>] (i2c_device_remove) from [<c03da280>] (__device_release_driver+0x84/0x100)
[   45.458540] [<c03da280>] (__device_release_driver) from [<c03da470>] (driver_detach+0xb4/0xb8)
[   45.467535] [<c03da470>] (driver_detach) from [<c03d9898>] (bus_remove_driver+0x4c/0x90)
[   45.475988] [<c03d9898>] (bus_remove_driver) from [<c00c54b8>] (SyS_delete_module+0x118/0x1e0)
[   45.484991] [<c00c54b8>] (SyS_delete_module) from [<c000f7e0>] (ret_fast_syscall+0x0/0x1c)
[   45.493626] Code: c0821ce8 000007e9 e92d4010 e1a04000 (e5d03474)
[   45.500040] ---[ end trace 6fe4be98a57ff92a ]---
Segmentation fault