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ALSA: PCM: Add missing rwsem around snd_ctl_remove() calls

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snd_ctl_remove() has to be called with card->controls_rwsem held (when
called after the card instantiation).  This patch add the missing
rwsem calls around it.

Fixes: a8ff48cb70 ("ALSA: pcm: Free chmap at PCM free callback, too")
Link: https://lore.kernel.org/r/20211116071314.15065-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2021-11-16 08:13:13 +01:00
parent 06764dc931
commit 5471e9762e
1 changed files with 5 additions and 1 deletions
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6
sound/core/pcm.c
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@ -810,7 +810,11 @@ EXPORT_SYMBOL(snd_pcm_new_internal);
static void free_chmap(struct snd_pcm_str *pstr)
{
if (pstr->chmap_kctl) {
snd_ctl_remove(pstr->pcm->card, pstr->chmap_kctl);
struct snd_card *card = pstr->pcm->card;
down_write(&card->controls_rwsem);
snd_ctl_remove(card, pstr->chmap_kctl);
up_write(&card->controls_rwsem);
pstr->chmap_kctl = NULL;
}
}