Hello,
On Tue, Nov 30, 2021 at 09:17:30AM +0800, Yu Kuai wrote:
> +void blk_throtl_cancel_bios(struct request_queue *q)
> +{
> + struct throtl_data *td = q->td;
> + struct blkcg_gq *blkg;
> + struct cgroup_subsys_state *pos_css;
> + struct bio *bio;
> + int rw;
> +
> + rcu_read_lock();
So, all of the draining is being performed without holding the q lock, which
*might* be okay given that we're in the del_gendisk path but is likely risky
- ie. there can still be timers or whatever racing against it.
Thanks.
--
tejun
