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ALSA: core: Use READ_ONCE() / WRITE_ONCE() for power state change

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We need proper barriers to handle the power state change of the card
from different CPUs.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20210523090920.15345-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2021-05-23 11:09:15 +02:00
parent 6efb943b86
commit 533a7ed9d5
1 changed files with 2 additions and 2 deletions
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4
include/sound/core.h
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@ -142,12 +142,12 @@ struct snd_card {
#ifdef CONFIG_PM
static inline unsigned int snd_power_get_state(struct snd_card *card)
{
return card->power_state;
return READ_ONCE(card->power_state);
}
static inline void snd_power_change_state(struct snd_card *card, unsigned int state)
{
card->power_state = state;
WRITE_ONCE(card->power_state, state);
wake_up(&card->power_sleep);
}