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Subject[BUG] ALSA: soc: sti: a possible sleep-in-atomic-context bug in uni_player_ctl_iec958_put()
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:
    mutex_lock in uni_player_set_channel_status
sound/soc/sti/uniperif_player.c, 608:
    uni_player_set_channel_status in uni_player_ctl_iec958_put
sound/soc/sti/uniperif_player.c, 603:
    _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

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