linux-kernel - [PATCH 3.4 82/99] ALSA: 6fire: Fix unlocked snd_pcm

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Date:	Fri,  7 Mar 2014 17:08:18 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
	Ben Hutchings <ben@...adent.org.uk>,
	Weng Meiling <wengmeiling.weng@...wei.com>
Subject: [PATCH 3.4 82/99] ALSA: 6fire: Fix unlocked snd_pcm_stop() call

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

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

From: Takashi Iwai <tiwai@...e.de>

commit 5b9ab3f7324a1b94a5a5a76d44cf92dfeb3b5e80 upstream.

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

Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: Weng Meiling <wengmeiling.weng@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/usb/6fire/pcm.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

--- a/sound/usb/6fire/pcm.c
+++ b/sound/usb/6fire/pcm.c
@@ -639,17 +639,25 @@ int __devinit usb6fire_pcm_init(struct s
 void usb6fire_pcm_abort(struct sfire_chip *chip)
 {
 	struct pcm_runtime *rt = chip->pcm;
+	unsigned long flags;
 	int i;
 
 	if (rt) {
 		rt->panic = true;
 
-		if (rt->playback.instance)
+		if (rt->playback.instance) {
+			snd_pcm_stream_lock_irqsave(rt->playback.instance, flags);
 			snd_pcm_stop(rt->playback.instance,
 					SNDRV_PCM_STATE_XRUN);
-		if (rt->capture.instance)
+			snd_pcm_stream_unlock_irqrestore(rt->playback.instance, flags);
+		}
+
+		if (rt->capture.instance) {
+			snd_pcm_stream_lock_irqsave(rt->capture.instance, flags);
 			snd_pcm_stop(rt->capture.instance,
 					SNDRV_PCM_STATE_XRUN);
+			snd_pcm_stream_unlock_irqrestore(rt->capture.instance, flags);
+		}
 
 		for (i = 0; i < PCM_N_URBS; i++) {
 			usb_poison_urb(&rt->in_urbs[i].instance);


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