[PATCH 13/26] dm: convert to blk_alloc_disk/blk_cleanup_disk

[Christoph Hellwig]

On Sun, May 23, 2021 at 10:10:34AM +0200, Hannes Reinecke wrote:
> Can't these conditionals be merged into a single 'if (md->disk)'?
> Eg like:
>
> 	if (md->disk) {
> 		spin_lock(&_minor_lock);
> 		md->disk->private_data = NULL;
> 		spin_unlock(&_minor_lock);
> 		del_gendisk(md->disk);
> 		dm_queue_destroy_keyslot_manager(md->queue);
> 		blk_cleanup_disk(md->queue);
> 	}
>
> We're now always allocating 'md->disk' and 'md->queue' together,
> so how can we end up in a situation where one is set without the other?

I guess we could do that, not sure it is worth the churn, though.