regcache: maple: Split ->populate() from ->init()

Split ->populate() implementation from ->init() code.
This decoupling will help for the further changes.

Signed-off-by: Andy Shevchenko <[e-mail]>
Reviewed-by: Charles Keepax <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/base/regmap/regcache-maple.c

···
 	return ret;
 }
 
+static int regcache_maple_init(struct regmap *map)
+{
+	struct maple_tree *mt;
+
+	mt = kmalloc(sizeof(*mt), map->alloc_flags);
+	if (!mt)
+		return -ENOMEM;
+	map->cache = mt;
+
+	mt_init(mt);
+
+	if (!mt_external_lock(mt) && map->lock_key)
+		lockdep_set_class_and_subclass(&mt->ma_lock, map->lock_key, 1);
+
+	return 0;
+}
+
 static int regcache_maple_exit(struct regmap *map)
 {
 	struct maple_tree *mt = map->cache;
···
 	return ret;
 }
 
-static int regcache_maple_init(struct regmap *map)
+static int regcache_maple_populate(struct regmap *map)
 {
-	struct maple_tree *mt;
 	int i;
 	int ret;
 	int range_start;
-
-	mt = kmalloc(sizeof(*mt), map->alloc_flags);
-	if (!mt)
-		return -ENOMEM;
-	map->cache = mt;
-
-	mt_init(mt);
-
-	if (!mt_external_lock(mt) && map->lock_key)
-		lockdep_set_class_and_subclass(&mt->ma_lock, map->lock_key, 1);
-
-	if (!map->num_reg_defaults)
-		return 0;
 
 	range_start = 0;
 
···
 			ret = regcache_maple_insert_block(map, range_start,
 							  i - 1);
 			if (ret != 0)
-				goto err;
+				return ret;
 
 			range_start = i;
 		}
 	}
 
 	/* Add the last block */
-	ret = regcache_maple_insert_block(map, range_start,
-					  map->num_reg_defaults - 1);
-	if (ret != 0)
-		goto err;
-
-	return 0;
-
-err:
-	regcache_maple_exit(map);
-	return ret;
+	return regcache_maple_insert_block(map, range_start, map->num_reg_defaults - 1);
 }
 
 struct regcache_ops regcache_maple_ops = {
···
 	.name = "maple",
 	.init = regcache_maple_init,
 	.exit = regcache_maple_exit,
+	.populate = regcache_maple_populate,
 	.read = regcache_maple_read,
 	.write = regcache_maple_write,
 	.drop = regcache_maple_drop,