!1502 block: don't set GD_NEED_PART_SCAN if scan partition failed

Merge Pull Request from: @ci-robot 
 
PR sync from: Li Lingfeng <lilingfeng3@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/3GH4GOG4AWQWHSAMBTS4ZV7OXVQKBRUE/ 
 
https://gitee.com/openeuler/kernel/issues/I7F7J3 
 
Link:https://gitee.com/openeuler/kernel/pulls/1502 

Reviewed-by: Yu Kuai <yukuai3@huawei.com> 
Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com> 
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com> 

block/genhd.c

@@ -770,6 +770,13 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode)
 	else
 		blkdev_put(bdev, mode & ~FMODE_EXCL);
 
+	/*
+	 * If blkdev_get_by_dev() failed early, GD_NEED_PART_SCAN is still set,
+	 * and this will cause that re-assemble partitioned raid device will
+	 * creat partition for underlying disk.
+	 */
+	clear_bit(GD_NEED_PART_SCAN, &disk->state);
+
 	if (!(mode & FMODE_EXCL)) {
 		bd_abort_claiming(claim, claim, disk_scan_partitions);
 		bdput(claim);