diff --git a/drivers/base/regmap/regcache-indexed.c b/drivers/base/regmap/regcache-indexed.c
index 268497aee46dac4009729e692c0a4bd5feb85b37..2e10bb13bfc496425e33976be992648a8201ca8e 100644
--- a/drivers/base/regmap/regcache-indexed.c
+++ b/drivers/base/regmap/regcache-indexed.c
@@ -45,8 +45,8 @@ static int regcache_indexed_sync(struct regmap *map)
 	int ret;
 
 	for (i = 0; i < map->num_reg_defaults; i++) {
-		ret = regmap_write(map, map->reg_defaults[i].reg,
-				   map->reg_defaults[i].def);
+		ret = _regmap_write(map, map->reg_defaults[i].reg,
+				    map->reg_defaults[i].def);
 		if (ret < 0)
 			return ret;
 		dev_dbg(map->dev, "Synced register %#x, value %#x\n",
diff --git a/drivers/base/regmap/regcache-lzo.c b/drivers/base/regmap/regcache-lzo.c
index 9079cb50b0b971bf084cf4e0566f22c232d8b567..ad6af925f56cca42e73fdf1fffef8bb415679a7f 100644
--- a/drivers/base/regmap/regcache-lzo.c
+++ b/drivers/base/regmap/regcache-lzo.c
@@ -339,7 +339,7 @@ static int regcache_lzo_sync(struct regmap *map)
 		if (ret)
 			return ret;
 		map->cache_bypass = 1;
-		ret = regmap_write(map, i, val);
+		ret = _regmap_write(map, i, val);
 		map->cache_bypass = 0;
 		if (ret)
 			return ret;
diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index de32ced1917ad1ca750f843a31e04945e8cf337b..40f23dd8478c48200e0c668bf47239188ad25916 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -327,7 +327,7 @@ static int regcache_rbtree_sync(struct regmap *map)
 			if (val == def)
 				continue;
 			map->cache_bypass = 1;
-			ret = regmap_write(map, regtmp, val);
+			ret = _regmap_write(map, regtmp, val);
 			map->cache_bypass = 0;
 			if (ret)
 				return ret;
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 2caf6e49c38928a4cee069046d63932b6145f5a3..59e432c0163d30a9771c4aeefd00f4c4e5e07c0c 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -230,6 +230,7 @@ int regcache_sync(struct regmap *map)
 
 	BUG_ON(!map->cache_ops);
 
+	mutex_lock(&map->lock);
 	dev_dbg(map->dev, "Syncing %s cache\n",
 		map->cache_ops->name);
 	name = map->cache_ops->name;
@@ -242,7 +243,7 @@ int regcache_sync(struct regmap *map)
 			if (ret < 0)
 				goto out;
 			map->cache_bypass = 1;
-			ret = regmap_write(map, i, val);
+			ret = _regmap_write(map, i, val);
 			map->cache_bypass = 0;
 			if (ret < 0)
 				goto out;
@@ -254,6 +255,7 @@ int regcache_sync(struct regmap *map)
 	}
 out:
 	trace_regcache_sync(map->dev, name, "stop");
+	mutex_unlock(&map->lock);
 
 	return ret;
 }