diff --git a/block/bfq-cgroup.c b/block/bfq-cgroup.c
index a9e8633388f40985a0a49246a1e95c37def3cc8f..58c6efa9f9a99970e7599b673df3f65f5f4a9810 100644
--- a/block/bfq-cgroup.c
+++ b/block/bfq-cgroup.c
@@ -913,7 +913,8 @@ static ssize_t bfq_io_set_weight(struct kernfs_open_file *of,
 	if (ret)
 		return ret;
 
-	return bfq_io_set_weight_legacy(of_css(of), NULL, weight);
+	ret = bfq_io_set_weight_legacy(of_css(of), NULL, weight);
+	return ret ?: nbytes;
 }
 
 #ifdef CONFIG_DEBUG_BLK_CGROUP