ASoC: wm_adsp: Add power lock for firmware change control

We should hold the DSP power lock whilst changing the firmware since we
need to check if it is running first.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index 19f0593..fd85a8c 100644 (file)
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -451,6 +451,7 @@ static int wm_adsp_fw_put(struct snd_kcontrol *kcontrol,
        struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        struct wm_adsp *dsp = snd_soc_codec_get_drvdata(codec);
+       int ret = 0;
 
        if (ucontrol->value.integer.value[0] == dsp[e->shift_l].fw)
                return 0;
@@ -458,12 +459,16 @@ static int wm_adsp_fw_put(struct snd_kcontrol *kcontrol,
        if (ucontrol->value.integer.value[0] >= WM_ADSP_NUM_FW)
                return -EINVAL;
 
+       mutex_lock(&dsp[e->shift_l].pwr_lock);
+
        if (dsp[e->shift_l].running)
-               return -EBUSY;
+               ret = -EBUSY;
+       else
+               dsp[e->shift_l].fw = ucontrol->value.integer.value[0];
 
-       dsp[e->shift_l].fw = ucontrol->value.integer.value[0];
+       mutex_unlock(&dsp[e->shift_l].pwr_lock);
 
-       return 0;
+       return ret;
 }
 
 static const struct soc_enum wm_adsp_fw_enum[] = {