Hi! > >> static void __exit apu_led_exit(void) > >> { > >> platform_device_unregister(apu_led->pdev); > >> platform_driver_unregister(&apu_led_driver); > >> } > > > > Normally, I'd expect _exit() to be 'reverse' of _init(). That is I'd > > expect reverese order there. > > That looked promising, but after inverting the order of the calls in > apu_led_exit(), the problem is still there but with a slightly different > backtrace: > > [ 11.320368] BUG: unable to handle kernel paging request at > ffffc900000b5618 > [ 11.327702] IP: [<ffffffff811dd099>] ioread32+0x29/0x30 > [ 11.333108] PGD 11a00e067 [ 11.335708] PUD 11a00f067 > PMD 11a014067 [ 11.339807] PTE 0 > [ 11.341783] > [ 11.343364] Oops: 0000 [#1] PREEMPT SMP > [ 11.347305] Modules linked in: arc4 ath10k_pci ath10k_core ath > mac80211 crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intele > [ 11.375310] CPU: 2 PID: 286 Comm: rmmod Not tainted 4.9.47 #37 > [ 11.381342] Hardware name: PC Engines APU2/APU2, BIOS 4.0.7 02/28/2017 > [ 11.388091] task: ffff880119af6540 task.stack: ffffc90000184000 > [ 11.394168] RIP: 0010:[<ffffffff811dd099>] [<ffffffff811dd099>] > ioread32+0x29/0x30 > [ 11.402044] RSP: 0018:ffffc90000187e40 EFLAGS: 00010292 > [ 11.407567] RAX: 0000000000000000 RBX: ffff88011a1e4ac8 RCX: > 0000000000001a22 > [ 11.414966] RDX: 0000000000000001 RSI: 0000000000000000 RDI: > ffffc900000b5618 > [ 11.422416] RBP: 0000000000000000 R08: 00000000000195a0 R09: > ffff88011ed0e8c0 > [ 11.429785] R10: ffffea0004686b80 R11: ffff88011a001c00 R12: > 0000000000000008 > [ 11.437184] R13: ffff88011a1ae480 R14: ffff88011a1ae460 R15: > 00000000007c5010 > [ 11.444535] FS: 00007f12f96ec700(0000) GS:ffff88011ed00000(0000) > knlGS:0000000000000000 > [ 11.452906] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 11.458842] CR2: ffffc900000b5618 CR3: 0000000115dee000 CR4: > 00000000000406e0 > [ 11.466308] Stack: > [ 11.468434] ffffffffa00d1023 ffff88011a1e4ac8 ffff88011a1e4ba0 > ffffffffa005e076 > [ 11.476255] ffffc90000187e78 ffff8801196ab810 ffffffff812923c0 > ffff880119528dc0 > [ 11.484073] ffff88011a1ae4a0 ffff8801196ab810 ffffffffa00d11e8 > ffff8801196ab870 > [ 11.491852] Call Trace: > [ 11.494427] [<ffffffffa00d1023>] ? apu2_led_brightness_set+0x23/0x58 > [leds_apu] > [ 11.502178] [<ffffffffa005e076>] ? led_classdev_unregister+0x46/0xa0 > [led_class] Hmm. can you put debug prints where in brightness_set() it fails? Is devm_() compatible with unregistering by hand? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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