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") Signed-off-by: Takashi Iwai tiwai@suse.de --- 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 6fd3677685d7..ba4a987ed1c6 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; } }