diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 1efe31615281..5a5c1f1bd8a5 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -191,7 +191,7 @@ STORE(__cached_dev)
 {
 	struct cached_dev *dc = container_of(kobj, struct cached_dev,
 					     disk.kobj);
-	ssize_t v = size;
+	ssize_t v;
 	struct cache_set *c;
 	struct kobj_uevent_env *env;
 
@@ -268,6 +268,7 @@ STORE(__cached_dev)
 		if (bch_parse_uuid(buf, set_uuid) < 16)
 			return -EINVAL;
 
+		v = -ENOENT;
 		list_for_each_entry(c, &bch_cache_sets, list) {
 			v = bch_cached_dev_attach(dc, c, set_uuid);
 			if (!v)
@@ -275,7 +276,7 @@ STORE(__cached_dev)
 		}
 
 		pr_err("Can't attach %s: cache set not found", buf);
-		size = v;
+		return v;
 	}
 
 	if (attr == &sysfs_detach && dc->disk.c)