diff --git a/[refs] b/[refs]
index 43abd76c52ba..08dbffc7b1bc 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ec8a365fe62c78a16268bd1d12dfbebc2b775991
+refs/heads/master: 38f6916976f9e964748f097be3688e334fb60f3d
diff --git a/trunk/drivers/base/regmap/regcache.c b/trunk/drivers/base/regmap/regcache.c
index f46e247912cb..744ed145bfa4 100644
--- a/trunk/drivers/base/regmap/regcache.c
+++ b/trunk/drivers/base/regmap/regcache.c
@@ -273,7 +273,9 @@ EXPORT_SYMBOL_GPL(regcache_sync);
  */
 void regcache_cache_only(struct regmap *map, bool enable)
 {
+	mutex_lock(&map->sync_lock);
 	map->cache_only = enable;
+	mutex_unlock(&map->sync_lock);
 }
 EXPORT_SYMBOL_GPL(regcache_cache_only);