[BUG] ALSA: soc: sti: a possible sleep-in-atomic-context bug in uni_player_ctl_iec958_put()

[Jia-Ju Bai]

The driver may sleep while holding a spinlock.
The function call path (from bottom to top) in Linux 4.19 is:

sound/soc/sti/uniperif_player.c, 229:
ÂÂÂ mutex_lock in uni_player_set_channel_status
sound/soc/sti/uniperif_player.c, 608:
ÂÂÂ uni_player_set_channel_status in uni_player_ctl_iec958_put
sound/soc/sti/uniperif_player.c, 603:
ÂÂÂ _raw_spin_lock_irqsave in uni_player_ctl_iec958_put

mutex_lock() can sleep at runtime.

I am not sure how to properly fix this possible bug, so I only report it.

This bug is found by a static analysis tool STCheck written by myself.


Best wishes,
Jia-Ju Bai