The driver may sleep under a spinlock.
The function call path is:
snd_cx88_switch_put (acquire the spinlock)
v4l2_ctrl_find
mutex_lock --> may sleep
I do not find a good way to fix it, so I only report.
This possible bug is found by my static analysis tool (DSAC) and checked
by my code review.
Thanks,
Jia-Ju Bai