On Tue, Jun 14, 2022 at 02:44:26PM +0800, Ming Lei wrote:
> Commit 5ca7546fe317 ("block: move rq_qos_exit() into disk_release()")
> moves rq_qos_exit() to disk_release(), but only done for blk-mq queue.
>
> However, now rq qos can be created via blkcg_init_queue() for bio based
> queue, so we need to call rq_qos_exit() for bio queue too.
>
> In theory, so far, rq_qos is only implemented for request based queue,
> and we should only add it for blk-mq queue. However, if using blk-mq
> during allocating queue may not be known, fix the rq qos leak issue by
> always releasing rq qos for both two kinds of queues.
This is also fixed by "block: disable the elevator int del_gendisk"
which was just resent yesterday, and fundamentally gets the lifetimes
right rather than doctoring around even more.
