Merge "block: Make del_gendisk() safer for disks without queues"

	disk->flags &= ~GENHD_FL_UP;

	sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");

	if (disk->queue) {

		/*

	 * Unregister bdi before releasing device numbers (as they can get

	 * reused and we'd get clashes in sysfs).

		 * Unregister bdi before releasing device numbers (as they can

		 * get reused and we'd get clashes in sysfs).

		 */

		bdi_unregister(&disk->queue->backing_dev_info);

		blk_unregister_queue(disk);

	} else {

		WARN_ON(1);

	}

	blk_unregister_region(disk_devt(disk), disk->minors);

	part_stat_set_all(&disk->part0, 0);