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blk-mq: fix race with timeouts and requeue events

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If a requeue event races with a timeout, we can get into the
situation where we attempt to complete a request from the
timeout handler when it's not start anymore. This causes a crash.
So have the timeout handler check that REQ_ATOM_STARTED is still
set on the request - if not, we ignore the event. If this happens,
the request has now been marked as complete. As a consequence, we
need to ensure to clear REQ_ATOM_COMPLETE in blk_mq_start_request(),
as to maintain proper request state.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2014-04-24 08:51:47 -06:00
commit 87ee7b1121
4 changed files with 42 additions and 18 deletions
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3
block/blk.h
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@ -37,9 +37,8 @@ bool __blk_end_bidi_request(struct request *rq, int error,
void blk_rq_timed_out_timer(unsigned long data);
void blk_rq_check_expired(struct request *rq, unsigned long *next_timeout,
unsigned int *next_set);
void __blk_add_timer(struct request *req, struct list_head *timeout_list);
void blk_add_timer(struct request *req);
void blk_delete_timer(struct request *);
void blk_add_timer(struct request *);
bool bio_attempt_front_merge(struct request_queue *q, struct request *req,