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authorTakashi Iwai <tiwai@suse.de>2012-10-12 15:07:34 +0200
committerTakashi Iwai <tiwai@suse.de>2012-10-30 11:06:48 +0100
commit9b0573c07f278e9888c352aa9724035c75784ea0 (patch)
treea5729ddd409994d5912ba71b372169e3fa7f879d /sound/core/pcm.c
parent1693849f71b818be9e6e2b6e6fbcb45f6f518f96 (diff)
downloadlinux-linaro-stable-9b0573c07f278e9888c352aa9724035c75784ea0.tar.gz
ALSA: PCM: Fix some races at disconnection
Fix races at PCM disconnection: - while a PCM device is being opened or closed - while the PCM state is being changed without lock in prepare, hw_params, hw_free ops Reported-by: Matthieu CASTET <matthieu.castet@parrot.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/pcm.c')
-rw-r--r--sound/core/pcm.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/sound/core/pcm.c b/sound/core/pcm.c
index f2991940b271..993b2405fdfe 100644
--- a/sound/core/pcm.c
+++ b/sound/core/pcm.c
@@ -1086,11 +1086,15 @@ static int snd_pcm_dev_disconnect(struct snd_device *device)
if (list_empty(&pcm->list))
goto unlock;
+ mutex_lock(&pcm->open_mutex);
list_del_init(&pcm->list);
for (cidx = 0; cidx < 2; cidx++)
- for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
+ for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) {
+ snd_pcm_stream_lock_irq(substream);
if (substream->runtime)
substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
+ snd_pcm_stream_unlock_irq(substream);
+ }
list_for_each_entry(notify, &snd_pcm_notify_list, list) {
notify->n_disconnect(pcm);
}
@@ -1110,6 +1114,7 @@ static int snd_pcm_dev_disconnect(struct snd_device *device)
pcm->streams[cidx].chmap_kctl = NULL;
}
}
+ mutex_unlock(&pcm->open_mutex);
unlock:
mutex_unlock(&register_mutex);
return 0;