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authorTakashi Iwai <tiwai@suse.de>2016-07-08 08:05:19 +0200
committerTakashi Iwai <tiwai@suse.de>2016-07-08 09:15:44 +0200
commitf388cdcdd160687c6650833f286b9c89c50960ff (patch)
treecbf0f3f2c7233225a19d274802d7de299d075125
parent8a132099f080d7384bb6ab4cc168f76cb4b47d08 (diff)
ALSA: ctl: Stop notification after disconnection
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>
-rw-r--r--sound/core/control.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/core/control.c b/sound/core/control.c
index a85d45595d02..b4fe9b002512 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -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++;