[ALSA] soc - Don't lock the codec list in snd_soc_dapm_new_widgets()

snd_soc_dapm_new_widgets() takes the codec lock when adding new widgets,
causing lockdep warnings when applications later call down through ALSA
to adjust controls.  Since widgets are only added during probe this lock
should be unneeded so don't take it.
Thanks to Dmitry Baryshkov <dbaryshkov@gmail.com> for reporting this issue.
Cc: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@perex.cz>

sound/soc/soc-dapm.c

@@ -971,7 +971,6 @@ int snd_soc_dapm_new_widgets(struct snd_soc_codec *codec)
 {
 	struct snd_soc_dapm_widget *w;
 
-	mutex_lock(&codec->mutex);
 	list_for_each_entry(w, &codec->dapm_widgets, list)
 	{
 		if (w->new)
@@ -1006,7 +1005,6 @@ int snd_soc_dapm_new_widgets(struct snd_soc_codec *codec)
 	}
 
 	dapm_power_widgets(codec, SND_SOC_DAPM_STREAM_NOP);
-	mutex_unlock(&codec->mutex);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_new_widgets);