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authorTakashi Iwai <tiwai@suse.de>2016-07-08 08:05:19 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-07-27 09:55:51 -0700
commit9381f9edbff5357cd5df6f4544c66620142d1169 (patch)
tree52e3b8f9aadf2c3662f19d164091500e94ec7eb2
parentdbcbd279f7764feb9e8d1051b58caab8866b65b8 (diff)
ALSA: ctl: Stop notification after disconnection
commit f388cdcdd160687c6650833f286b9c89c50960ff upstream. 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. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-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 3fcead61f0ef..251bc575f5c3 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -150,6 +150,8 @@ 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 defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
card->mixer_oss_change_count++;