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blk-mq: End unstarted requests on a dying queue 

Requests that haven't been started prior to a queue dying can be ended
in error without waiting for them to start and time out.

Signed-off-by: Keith Busch <keith.busch@intel.com>

Added code comment to explain why this is done.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2015-01-08 08:59:53 -07:00 committed by Jens Axboe
parent 5b3f25fc34
commit eb130dbfc4
1 changed files with 10 additions and 1 deletions
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11
block/blk-mq.c
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@ -625,8 +625,17 @@ static void blk_mq_check_expired(struct blk_mq_hw_ctx *hctx,
{
struct blk_mq_timeout_data *data = priv;
if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags))
if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) {
/*
* If a request wasn't started before the queue was
* marked dying, kill it here or it'll go unnoticed.
*/
if (unlikely(blk_queue_dying(rq->q))) {
rq->errors = -EIO;
blk_mq_complete_request(rq);
}
return;
}
if (rq->cmd_flags & REQ_NO_TIMEOUT)
return;