On 9/18/20 9:54 PM, yangerkun wrote:
> 'f5bbbbe4d635 ("blk-mq: sync the update nr_hw_queues with
> blk_mq_queue_tag_busy_iter")' introduce a bug what we may sleep between
> rcu lock. Then '530ca2c9bd69 ("blk-mq: Allow blocking queue tag iter
> callbacks")' fix it by get request_queue's ref. And 'a9a808084d6a ("block:
> Remove the synchronize_rcu() call from __blk_mq_update_nr_hw_queues()")'
> remove the synchronize_rcu in __blk_mq_update_nr_hw_queues. We need
> update the confused comments in blk_mq_queue_tag_busy_iter.
Applied, thanks.
--
Jens Axboe
