linux-kernel - [PATCH 3.4 85/99] ALSA: pxa2xx: Fix unlocked snd_pcm

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Message-Id: <20140308010614.310086066@linuxfoundation.org>
Date:	Fri,  7 Mar 2014 17:08:21 -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, Mark Brown <broonie@...aro.org>,
	Takashi Iwai <tiwai@...e.de>,
	Ben Hutchings <ben@...adent.org.uk>,
	Weng Meiling <wengmeiling.weng@...wei.com>
Subject: [PATCH 3.4 85/99] ALSA: pxa2xx: 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 46f6c1aaf790be9ea3c8ddfc8f235a5f677d08e2 upstream.

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

Acked-by: Mark Brown <broonie@...aro.org>
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/arm/pxa2xx-pcm-lib.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/sound/arm/pxa2xx-pcm-lib.c
+++ b/sound/arm/pxa2xx-pcm-lib.c
@@ -166,7 +166,9 @@ void pxa2xx_pcm_dma_irq(int dma_ch, void
 	} else {
 		printk(KERN_ERR "%s: DMA error on channel %d (DCSR=%#x)\n",
 			rtd->params->name, dma_ch, dcsr);
+		snd_pcm_stream_lock(substream);
 		snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+		snd_pcm_stream_unlock(substream);
 	}
 }
 EXPORT_SYMBOL(pxa2xx_pcm_dma_irq);


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