diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index 30947f923620..09230cf3a244 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -428,8 +428,13 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
 			continue;
 		}
 		if (!dev->bdev) {
-			/* cannot read ahead on missing device */
-			continue;
+			/*
+			 * cannot read ahead on missing device, but for RAID5/6,
+			 * REQ_GET_READ_MIRRORS return 1. So don't skip missing
+			 * device for such case.
+			 */
+			if (nzones > 1)
+				continue;
 		}
 		if (dev_replace_is_ongoing &&
 		    dev == fs_info->dev_replace.tgtdev) {