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ASoC: wm8994: Prevent double lock of accdet_lock mutex on wm1811 

commit b38314179c upstream.

wm1811_micd_stop takes the accdet_lock mutex, and is called from two
places, one of which is already holding the accdet_lock. This obviously
causes a lock up.

This patch fixes this issue by removing the lock from wm1811_micd_stop
and ensuring that it is always locked externally.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Charles Keepax 2014-06-16 21:24:03 +01:00 committed by Greg Kroah-Hartman
parent 1040b2300e
commit 32eda01126
1 changed files with 3 additions and 6 deletions
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9
sound/soc/codecs/wm8994.c
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@ -3497,6 +3497,7 @@ static irqreturn_t wm8994_mic_irq(int irq, void *data)
return IRQ_HANDLED;
}
/* Should be called with accdet_lock held */
static void wm1811_micd_stop(struct snd_soc_codec *codec)
{
struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
@ -3504,14 +3505,10 @@ static void wm1811_micd_stop(struct snd_soc_codec *codec)
if (!wm8994->jackdet)
return;
mutex_lock(&wm8994->accdet_lock);
snd_soc_update_bits(codec, WM8958_MIC_DETECT_1, WM8958_MICD_ENA, 0);
wm1811_jackdet_set_mode(codec, WM1811_JACKDET_MODE_JACK);
mutex_unlock(&wm8994->accdet_lock);
if (wm8994->wm8994->pdata.jd_ext_cap)
snd_soc_dapm_disable_pin(&codec->dapm,
"MICBIAS2");
@ -3552,10 +3549,10 @@ static void wm8958_open_circuit_work(struct work_struct *work)
open_circuit_work.work);
struct device *dev = wm8994->wm8994->dev;
wm1811_micd_stop(wm8994->hubs.codec);
mutex_lock(&wm8994->accdet_lock);
wm1811_micd_stop(wm8994->hubs.codec);
dev_dbg(dev, "Reporting open circuit\n");
wm8994->jack_mic = false;