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ALSA: core: Simplify snd_power_ref_and_wait() with the standard macro

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Use wait_event_cmd() macro and simplify snd_power_ref_wait()
implementation.  This may also cover possible races in the current
open code, too.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20220119091050.30125-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2022-01-19 10:10:50 +01:00
parent 85c25662d1
commit 8c0ae778e2
1 changed files with 5 additions and 20 deletions
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25
sound/core/init.c
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@ -1111,29 +1111,14 @@ EXPORT_SYMBOL(snd_card_file_remove);
*/
int snd_power_ref_and_wait(struct snd_card *card)
{
wait_queue_entry_t wait;
int result = 0;
snd_power_ref(card);
/* fastpath */
if (snd_power_get_state(card) == SNDRV_CTL_POWER_D0)
return 0;
init_waitqueue_entry(&wait, current);
add_wait_queue(&card->power_sleep, &wait);
while (1) {
if (card->shutdown) {
result = -ENODEV;
break;
}
if (snd_power_get_state(card) == SNDRV_CTL_POWER_D0)
break;
snd_power_unref(card);
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(30 * HZ);
snd_power_ref(card);
}
remove_wait_queue(&card->power_sleep, &wait);
return result;
wait_event_cmd(card->power_sleep,
card->shutdown ||
snd_power_get_state(card) == SNDRV_CTL_POWER_D0,
snd_power_unref(card), snd_power_ref(card));
return card->shutdown ? -ENODEV : 0;
}
EXPORT_SYMBOL_GPL(snd_power_ref_and_wait);