[PATCH 029/106] ALSA: usx2y: Fix unlocked snd_pcm_stop() call

[Luis Henriques]

3.5.7.18 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Iwai <tiwai at suse.de>

commit 5be1efb4c2ed79c3d7c0cbcbecae768377666e84 upstream.

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

Signed-off-by: Takashi Iwai <tiwai at suse.de>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 sound/usb/usx2y/usbusx2yaudio.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/usb/usx2y/usbusx2yaudio.c b/sound/usb/usx2y/usbusx2yaudio.c
index 520ef96..43d337d 100644
--- a/sound/usb/usx2y/usbusx2yaudio.c
+++ b/sound/usb/usx2y/usbusx2yaudio.c
@@ -273,7 +273,11 @@ static void usX2Y_clients_stop(struct usX2Ydev *usX2Y)
 		struct snd_usX2Y_substream *subs = usX2Y->subs[s];
 		if (subs) {
 			if (atomic_read(&subs->state) >= state_PRERUNNING) {
+				unsigned long flags;
+
+				snd_pcm_stream_lock_irqsave(subs->pcm_substream, flags);
 				snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
+				snd_pcm_stream_unlock_irqrestore(subs->pcm_substream, flags);
 			}
 			for (u = 0; u < NRURBS; u++) {
 				struct urb *urb = subs->urb[u];
-- 
1.8.3.2