Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 240/563] ALSA: PCM: Add missing rwsem around snd_ctl_remove() calls | Date | Mon, 24 Jan 2022 19:40:05 +0100 |
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From: Takashi Iwai <tiwai@suse.de>
[ Upstream commit 5471e9762e1af4b7df057a96bfd46cc250979b88 ]
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: a8ff48cb7083 ("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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- sound/core/pcm.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/sound/core/pcm.c b/sound/core/pcm.c index 41cbdac5b1cfa..a8ae5928decda 100644 --- a/sound/core/pcm.c +++ b/sound/core/pcm.c @@ -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; } } -- 2.34.1
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