linux-kernel - [ 021/122] ASoC: dapm: Fix locking during codec shutdown

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Message-Id: <20120807221950.136517303@linuxfoundation.org>
Date:	Tue,  7 Aug 2012 15:25:09 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Misael Lopez Cruz <misael.lopez@...com>,
	Liam Girdwood <lrg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [ 021/122] ASoC: dapm: Fix locking during codec shutdown

From: Greg KH <gregkh@...uxfoundation.org>

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

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

From: Liam Girdwood <lrg@...com>

commit 01005a729a17ab419f61a366e22f3419e7a2c3fe upstream.

Codec shutdown performs a DAPM power sequence that might cause conflicts
and/or race conditions if another stream power event is running simultaneously.
Use card's dapm mutex to protect any potential race condition between them.

Signed-off-by: Misael Lopez Cruz <misael.lopez@...com>
Signed-off-by: Liam Girdwood <lrg@...com>
Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/soc/soc-dapm.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -3538,10 +3538,13 @@ EXPORT_SYMBOL_GPL(snd_soc_dapm_free);
 
 static void soc_dapm_shutdown_codec(struct snd_soc_dapm_context *dapm)
 {
+	struct snd_soc_card *card = dapm->card;
 	struct snd_soc_dapm_widget *w;
 	LIST_HEAD(down_list);
 	int powerdown = 0;
 
+	mutex_lock(&card->dapm_mutex);
+
 	list_for_each_entry(w, &dapm->card->widgets, list) {
 		if (w->dapm != dapm)
 			continue;
@@ -3564,6 +3567,8 @@ static void soc_dapm_shutdown_codec(stru
 			snd_soc_dapm_set_bias_level(dapm,
 						    SND_SOC_BIAS_STANDBY);
 	}
+
+	mutex_unlock(&card->dapm_mutex);
 }
 
 /*


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