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ASoC: dapm: Fix locking during codec shutdown 

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@ti.com>
Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Liam Girdwood 2012-07-06 16:57:05 +01:00 committed by Mark Brown
parent 32fee7afe7
commit 01005a729a
1 changed files with 5 additions and 0 deletions
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5
sound/soc/soc-dapm.c
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@ -3537,10 +3537,13 @@ 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;
@ -3563,6 +3566,8 @@ static void soc_dapm_shutdown_codec(struct snd_soc_dapm_context *dapm)
snd_soc_dapm_set_bias_level(dapm,
SND_SOC_BIAS_STANDBY);
}
mutex_unlock(&card->dapm_mutex);
}
/*