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blk-mq: Fix timeout and state order 

The block layer had been setting the state to in-flight prior to updating
the timer. This is the wrong order since the timeout handler could observe
the in-flight state with the older timeout, believing the request had
expired when in fact it is just getting started.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
zero-colors
Keith Busch 2018-05-29 15:52:27 +02:00 committed by Jens Axboe
parent 01fc27d969
commit ad103e7983
1 changed files with 1 additions and 1 deletions
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2
block/blk-mq.c
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@ -697,8 +697,8 @@ void blk_mq_start_request(struct request *rq)
preempt_disable();
write_seqcount_begin(&rq->gstate_seq);
blk_mq_rq_update_state(rq, MQ_RQ_IN_FLIGHT);
blk_add_timer(rq);
blk_mq_rq_update_state(rq, MQ_RQ_IN_FLIGHT);
write_seqcount_end(&rq->gstate_seq);
preempt_enable();