Apply upstream solution [1][2] to fix below kernel panic:
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000208 ... pc : _raw_spin_lock_irqsave+0x50/0x90 lr : v4l2_m2m_cancel_job+0x38/0x1c4 [v4l2_mem2mem] sp : ffffffc012d2bcb0 x29: ffffffc012d2bcb0 x28: ffffff8098d6bb00 x27: 0000000000000000 x26: ffffffc01009b5c8 x25: 00000000000e001f x24: ffffff808ff3eb50 x23: ffffffc01009f5a0 x22: 0000000000000000 x21: ffffff808ffef000 x20: 0000000000000208 x19: 0000000000000000 x18: ffffffc012b51048 x17: ffffffc011e0ef7c x16: 00000000000000c0 x15: ffffffc010fc78f4 x14: ffffffc0119dd790 x13: 0000000000001b26 x12: 0000000053555555 x11: 0000000000000002 x10: 0000000000000001 x9 : 0000000000000000 x8 : 0000000000000208 x7 : 2020202020202020 x6 : ffffffc011e313a6 x5 : 0000000000000000 x4 : 0000000000000008 x3 : 000000000000002e x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000208 Call trace: _raw_spin_lock_irqsave+0x50/0x90 v4l2_m2m_cancel_job+0x38/0x1c4 [v4l2_mem2mem] v4l2_m2m_ctx_release+0x38/0x60 [v4l2_mem2mem] vim2m_release+0x5c/0xe0 [vim2m] v4l2_release+0x90/0x18c __fput+0xdc/0x2cc ____fput+0x10/0x1c task_work_run+0xc4/0x130 do_notify_resume+0xdc/0x158 work_pending+0x8/0x10
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
Hans Verkuil (1): media: vim2m: initialize the media device earlier
Sakari Ailus (1): media: vim2m: Register video device after setting up internals
drivers/media/test-drivers/vim2m.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-)