If vimc module is removed while streaming is in progress, sensor
subdev unregister runs into general protection fault when it tries
to unregister media entities.
vimc_ent_sd_unregister() is fixed to call vimc_pads_cleanup() to
release media pads after v4l2_device_unregister_subdev() is done
unregistering the subdev and stop accessing media objects.
kernel: [ 4136.715839] general protection fault: 0000 [#1] SMP PTI
kernel: [ 4136.715847] CPU: 2 PID: 1972 Comm: bash Not tainted 5.3.0-rc2+ #4
kernel: [ 4136.715850] Hardware name: Dell Inc. OptiPlex 790/0HY9JP, BIOS A18 09/24/2013
kernel: [ 4136.715858] RIP: 0010:media_gobj_destroy.part.16+0x1f/0x60
kernel: [ 4136.715863] Code: ff 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90 55 48 89 fe 48 89 e5 53 48 89 fb 48 c7 c7 00 7f cf b0 e8 24 fa ff ff 48 8b 03 <48> 83 80 a0 00 00 00 01 48 8b 43 18 48 8b 53 10 48 89 42 08 48 89
kernel: [ 4136.715866] RSP: 0018:ffff9b2248fe3cb0 EFLAGS: 00010246
kernel: [ 4136.715870] RAX: bcf2bfbfa0d63c2f RBX: ffff88c3eb37e9c0 RCX: 00000000802a0018
kernel: [ 4136.715873] RDX: ffff88c3e4f6a078 RSI: ffff88c3eb37e9c0 RDI: ffffffffb0cf7f00
kernel: [ 4136.715876] RBP: ffff9b2248fe3cb8 R08: 0000000001000002 R09: ffffffffb0492b00
kernel: [ 4136.715879] R10: ffff9b2248fe3c28 R11: 0000000000000001 R12: 0000000000000038
kernel: [ 4136.715881] R13: ffffffffc09a1628 R14: ffff88c3e4f6a028 R15: fffffffffffffff2
kernel: [ 4136.715885] FS: 00007f8389647740(0000) GS:ffff88c465500000(0000) knlGS:0000000000000000
kernel: [ 4136.715888] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: [ 4136.715891] CR2: 000055d008f80fd8 CR3: 00000001996ec005 CR4: 00000000000606e0
kernel: [ 4136.715894] Call Trace:
kernel: [ 4136.715903] media_gobj_destroy+0x14/0x20
kernel: [ 4136.715908] __media_device_unregister_entity+0xb3/0xe0
kernel: [ 4136.715915] media_device_unregister_entity+0x30/0x40
kernel: [ 4136.715920] v4l2_device_unregister_subdev+0xa8/0xe0
kernel: [ 4136.715928] vimc_ent_sd_unregister+0x1e/0x30 [vimc]
kernel: [ 4136.715933] vimc_sen_rm+0x16/0x20 [vimc]
kernel: [ 4136.715938] vimc_remove+0x3e/0xa0 [vimc]
kernel: [ 4136.715945] platform_drv_remove+0x25/0x50
kernel: [ 4136.715951] device_release_driver_internal+0xe0/0x1b0
kernel: [ 4136.715956] device_driver_detach+0x14/0x20
kernel: [ 4136.715960] unbind_store+0xd1/0x130
kernel: [ 4136.715965] drv_attr_store+0x27/0x40
kernel: [ 4136.715971] sysfs_kf_write+0x48/0x60
kernel: [ 4136.715976] kernfs_fop_write+0x128/0x1b0
kernel: [ 4136.715982] __vfs_write+0x1b/0x40
kernel: [ 4136.715987] vfs_write+0xc3/0x1d0
kernel: [ 4136.715993] ksys_write+0xaa/0xe0
kernel: [ 4136.715999] __x64_sys_write+0x1a/0x20
kernel: [ 4136.716005] do_syscall_64+0x5a/0x130
kernel: [ 4136.716010] entry_SYSCALL_64_after_hwframe+0x4
Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/platform/vimc/vimc-common.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/platform/vimc/vimc-common.c b/drivers/media/platform/vimc/vimc-common.c
index 03016f204d05..abace5e0b4d3 100644
--- a/drivers/media/platform/vimc/vimc-common.c
+++ b/drivers/media/platform/vimc/vimc-common.c
@@ -373,7 +373,7 @@ EXPORT_SYMBOL_GPL(vimc_ent_sd_register);
void vimc_ent_sd_unregister(struct vimc_ent_device *ved, struct v4l2_subdev *sd)
{
media_entity_cleanup(ved->ent);
- vimc_pads_cleanup(ved->pads);
v4l2_device_unregister_subdev(sd);
+ vimc_pads_cleanup(ved->pads);
}
EXPORT_SYMBOL_GPL(vimc_ent_sd_unregister);
--
2.17.1
