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ALSA: ctl: Stop notification after disconnection

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snd_ctl_remove() has a notification for the removal event.  It's
superfluous when done during the device got disconnected.  Although
the notification itself is mostly harmless, it may potentially be
harmful, and should be suppressed.  Actually some components PCM may
free ctl elements during the disconnect or free callbacks, thus it's
no theoretical issue.

This patch adds the check of card->shutdown flag for avoiding
unnecessary notifications after (or during) the disconnect.

Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2016-07-08 08:05:19 +02:00
parent 8a132099f0
commit f388cdcdd1
1 changed files with 2 additions and 0 deletions
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2
sound/core/control.c
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@ -160,6 +160,8 @@ void snd_ctl_notify(struct snd_card *card, unsigned int mask,
if (snd_BUG_ON(!card || !id))
return;
if (card->shutdown)
return;
read_lock(&card->ctl_files_rwlock);
#if IS_ENABLED(CONFIG_SND_MIXER_OSS)
card->mixer_oss_change_count++;