diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index ad5a3456cd8a..3ee590cf12a7 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -1016,7 +1016,6 @@ static int md_bitmap_file_test_bit(struct bitmap *bitmap, sector_t block)
 	return set;
 }
 
-
 /* this gets called when the md device is ready to unplug its underlying
  * (slave) device queues -- before we let any writes go down, we need to
  * sync the dirty pages of the bitmap file to disk */
@@ -1026,8 +1025,7 @@ void md_bitmap_unplug(struct bitmap *bitmap)
 	int dirty, need_write;
 	int writing = 0;
 
-	if (!bitmap || !bitmap->storage.filemap ||
-	    test_bit(BITMAP_STALE, &bitmap->flags))
+	if (!md_bitmap_enabled(bitmap))
 		return;
 
 	/* look at each page to see if there are any set bits that need to be
diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h
index cfd7395de8fd..3a4750952b3a 100644
--- a/drivers/md/md-bitmap.h
+++ b/drivers/md/md-bitmap.h
@@ -273,6 +273,13 @@ int md_bitmap_copy_from_slot(struct mddev *mddev, int slot,
 			     sector_t *lo, sector_t *hi, bool clear_bits);
 void md_bitmap_free(struct bitmap *bitmap);
 void md_bitmap_wait_behind_writes(struct mddev *mddev);
+
+static inline bool md_bitmap_enabled(struct bitmap *bitmap)
+{
+	return bitmap && bitmap->storage.filemap &&
+	       !test_bit(BITMAP_STALE, &bitmap->flags);
+}
+
 #endif
 
 #endif
diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c
index 21b0ff3ca4f0..52469e460dab 100644
--- a/drivers/md/raid1-10.c
+++ b/drivers/md/raid1-10.c
@@ -132,9 +132,18 @@ static inline bool raid1_add_bio_to_plug(struct mddev *mddev, struct bio *bio,
 				      blk_plug_cb_fn unplug)
 {
 	struct raid1_plug_cb *plug = NULL;
-	struct blk_plug_cb *cb = blk_check_plugged(unplug, mddev,
-						   sizeof(*plug));
+	struct blk_plug_cb *cb;
 
+	/*
+	 * If bitmap is not enabled, it's safe to submit the io directly, and
+	 * this can get optimal performance.
+	 */
+	if (!md_bitmap_enabled(mddev->bitmap)) {
+		raid1_submit_write(bio);
+		return true;
+	}
+
+	cb = blk_check_plugged(unplug, mddev, sizeof(*plug));
 	if (!cb)
 		return false;