At Tue, 13 Nov 2012 09:30:10 +0100, Jiri Slaby wrote:

On 11/13/2012 09:28 AM, Takashi Iwai wrote:

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At Tue, 13 Nov 2012 09:26:17 +0100, Jiri Slaby wrote:

...

Hello,

I've just plugged+unplugged+plugged my USB audio card and the audio subsystem got stuck:

Which kernel? If it's older than 3.7-rc5, could you try 3.7-rc5?

Oh, forgot to mention: 3.7.0-rc5-next-20121112_64+

Through a quick glance, one of mutex locks seems stuck. Just a blind short -- does the patch below cure the problem?

thanks,

Takashi

--- diff --git a/sound/core/pcm.c b/sound/core/pcm.c index 030102c..a66a7ca 100644 --- a/sound/core/pcm.c +++ b/sound/core/pcm.c @@ -1086,7 +1086,7 @@ static int snd_pcm_dev_disconnect(struct snd_device *device) if (list_empty(&pcm->list)) goto unlock;

- mutex_lock(&pcm->open_mutex); + /* mutex_lock(&pcm->open_mutex); */ wake_up(&pcm->open_wait); list_del_init(&pcm->list); for (cidx = 0; cidx < 2; cidx++) @@ -1118,7 +1118,7 @@ static int snd_pcm_dev_disconnect(struct snd_device *device) pcm->streams[cidx].chmap_kctl = NULL; } } - mutex_unlock(&pcm->open_mutex); + /* mutex_unlock(&pcm->open_mutex); */ unlock: mutex_unlock(&register_mutex); return 0;