CPU0:
snd_trident_hw_free
snd_trident_free_voice
line 3870: spin_lock_irqsave()
line 3881: voice->substream = NULL; [WRITE]
CPU1:
snd_trident_interrupt
line 3798: snd_pcm_period_elapsed(voice->substream); [READ]
As for voice->substream, the WRITE operation in CPU0 is performed
with holding a spinlock, but the READ operation in CPU1 is performed
without holding this spinlock, so there may exist a data race.
Best wishes,
Jia-Ju Bai
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