diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 24489126f8ca..d8ea7ed411b2 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1380,6 +1380,10 @@ static long writeback_chunk_size(struct bdi_writeback *wb,
  * Write a portion of b_io inodes which belong to @sb.
  *
  * Return the number of pages and/or inodes written.
+ *
+ * NOTE! This is called with wb->list_lock held, and will
+ * unlock and relock that for each inode it ends up doing
+ * IO for.
  */
 static long writeback_sb_inodes(struct super_block *sb,
 				struct bdi_writeback *wb,
@@ -1398,9 +1402,7 @@ static long writeback_sb_inodes(struct super_block *sb,
 	unsigned long start_time = jiffies;
 	long write_chunk;
 	long wrote = 0;  /* count both pages and inodes */
-	struct blk_plug plug;
 
-	blk_start_plug(&plug);
 	while (!list_empty(&wb->b_io)) {
 		struct inode *inode = wb_inode(wb->b_io.prev);
 
@@ -1498,7 +1500,6 @@ static long writeback_sb_inodes(struct super_block *sb,
 				break;
 		}
 	}
-	blk_finish_plug(&plug);
 	return wrote;
 }