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blk-mq: introduce blk_mq_quiesce_queue_nowait() 

This patch introduces blk_mq_quiesce_queue_nowait() so
that we can workaround mpt3sas for quiescing its queue.

Once mpt3sas is fixed, we can remove this helper.

Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.1
Ming Lei 2017-06-06 23:22:02 +08:00 committed by Jens Axboe
parent 97e0120990
commit 4f084b41a0
1 changed files with 8 additions and 0 deletions
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8
include/linux/blk-mq.h
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@ -262,6 +262,14 @@ int blk_mq_reinit_tagset(struct blk_mq_tag_set *set);
int blk_mq_map_queues(struct blk_mq_tag_set *set);
void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
/*
* FIXME: this helper is just for working around mpt3sas.
*/
static inline void blk_mq_quiesce_queue_nowait(struct request_queue *q)
{
blk_mq_stop_hw_queues(q);
}
/*
* Driver command data is immediately after the request. So subtract request
* size to get back to the original request, add request size to get the PDU.