ALSA: ua101: Fix unlocked snd_pcm_stop() call
Takashi Iwai [Thu, 11 Jul 2013 15:58:25 +0000 (17:58 +0200)]
commit 9538aa46c2427d6782aa10036c4da4c541605e0e upstream.

snd_pcm_stop() must be called in the PCM substream lock context.

Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

sound/usb/misc/ua101.c

index 6ad617b..76d8329 100644 (file)
@@ -613,14 +613,24 @@ static int start_usb_playback(struct ua101 *ua)
 
 static void abort_alsa_capture(struct ua101 *ua)
 {
-       if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states))
+       unsigned long flags;
+
+       if (test_bit(ALSA_CAPTURE_RUNNING, &ua->states)) {
+               snd_pcm_stream_lock_irqsave(ua->capture.substream, flags);
                snd_pcm_stop(ua->capture.substream, SNDRV_PCM_STATE_XRUN);
+               snd_pcm_stream_unlock_irqrestore(ua->capture.substream, flags);
+       }
 }
 
 static void abort_alsa_playback(struct ua101 *ua)
 {
-       if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states))
+       unsigned long flags;
+
+       if (test_bit(ALSA_PLAYBACK_RUNNING, &ua->states)) {
+               snd_pcm_stream_lock_irqsave(ua->playback.substream, flags);
                snd_pcm_stop(ua->playback.substream, SNDRV_PCM_STATE_XRUN);
+               snd_pcm_stream_unlock_irqrestore(ua->playback.substream, flags);
+       }
 }
 
 static int set_stream_hw(struct ua101 *ua, struct snd_pcm_substream *substream,