block/loop: Delete gendisk before cleaning up the request queue

Remove the disk, partition and bdi sysfs attributes before cleaning up
the request queue associated with the disk.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Cc: Josef Bacik <jbacik@fb.com>
Cc: Shaohua Li <shli@fb.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/loop.c

@@ -1864,8 +1864,8 @@ static int loop_add(struct loop_device **l, int i)
 
 static void loop_remove(struct loop_device *lo)
 {
-	blk_cleanup_queue(lo->lo_queue);
 	del_gendisk(lo->lo_disk);
+	blk_cleanup_queue(lo->lo_queue);
 	blk_mq_free_tag_set(&lo->tag_set);
 	put_disk(lo->lo_disk);
 	kfree(lo);