ASoC: dapm: Add unlocked version of snd_soc_dapm_sync

We will often call sync after several functions that require the DAPM
mutex to be held. Rather than release and immediately relock the mutex
provide an unlocked function for this situation.

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

2 files changed, 23 insertions, 5 deletions

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index 6e89ef6c11c1..3b991766a8f2 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -461,6 +461,7 @@ int snd_soc_dapm_nc_pin_unlocked(struct snd_soc_dapm_context *dapm,
 int snd_soc_dapm_get_pin_status(struct snd_soc_dapm_context *dapm,
                                 const char *pin);
 int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm);
+int snd_soc_dapm_sync_unlocked(struct snd_soc_dapm_context *dapm);
 int snd_soc_dapm_force_enable_pin(struct snd_soc_dapm_context *dapm,
                                   const char *pin);
 int snd_soc_dapm_force_enable_pin_unlocked(struct snd_soc_dapm_context *dapm,
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 48a4eeb05192..4200f96a1483 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -2342,18 +2342,18 @@ static int snd_soc_dapm_set_pin(struct snd_soc_dapm_context *dapm,
 }
 
 /**
- * snd_soc_dapm_sync - scan and power dapm paths
+ * snd_soc_dapm_sync_unlocked - scan and power dapm paths
  * @dapm: DAPM context
  *
  * Walks all dapm audio paths and powers widgets according to their
  * stream or path usage.
  *
+ * Requires external locking.
+ *
  * Returns 0 for success.
  */
-int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
+int snd_soc_dapm_sync_unlocked(struct snd_soc_dapm_context *dapm)
 {
-        int ret;
-
         /*
          * Suppress early reports (eg, jacks syncing their state) to avoid
          * silly DAPM runs during card startup.
@@ -2361,8 +2361,25 @@ int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
         if (!dapm->card || !dapm->card->instantiated)
                 return 0;
 
+        return dapm_power_widgets(dapm->card, SND_SOC_DAPM_STREAM_NOP);
+}
+EXPORT_SYMBOL_GPL(snd_soc_dapm_sync_unlocked);
+
+/**
+ * snd_soc_dapm_sync - scan and power dapm paths
+ * @dapm: DAPM context
+ *
+ * Walks all dapm audio paths and powers widgets according to their
+ * stream or path usage.
+ *
+ * Returns 0 for success.
+ */
+int snd_soc_dapm_sync(struct snd_soc_dapm_context *dapm)
+{
+        int ret;
+
         mutex_lock_nested(&dapm->card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
-        ret = dapm_power_widgets(dapm->card, SND_SOC_DAPM_STREAM_NOP);
+        ret = snd_soc_dapm_sync_unlocked(dapm);
         mutex_unlock(&dapm->card->dapm_mutex);
         return ret;
 }