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block: urgent request: Update dispatch_urgent in case of requeue/reinsert 

The block layer implements a mechanism for verifying that the device
driver won't be notified of an URGENT request if there is already an
URGENT request in flight. This is due to the fact that interrupting an
URGENT request isn't efficient.
This patch fixes the above described mechanism in case the URGENT request
was returned back to the block layer from some reason: by requeue or
reinsert.

CRs-fixed: 473376, 473036, 471736
Change-Id: Ie8b8208230a302d4526068531616984825f1050d
Signed-off-by: Tatyana Brokhman <tlinder@codeaurora.org>
This commit is contained in:
Tatyana Brokhman 2013-04-11 14:57:15 +03:00
parent 7c1d5281ea
commit fd79902a53
1 changed files with 20 additions and 0 deletions
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20
block/blk-core.c
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@ -1080,6 +1080,16 @@ void blk_requeue_request(struct request_queue *q, struct request *rq)
BUG_ON(blk_queued_rq(rq));
if (rq->cmd_flags & REQ_URGENT) {
/*
* It's not compliant with the design to re-insert
* urgent requests. We want to be able to track this
* down.
*/
pr_err("%s(): requeueing an URGENT request", __func__);
WARN_ON(!q->dispatched_urgent);
q->dispatched_urgent = false;
}
elv_requeue_request(q, rq);
}
EXPORT_SYMBOL(blk_requeue_request);
@ -1107,6 +1117,16 @@ int blk_reinsert_request(struct request_queue *q, struct request *rq)
blk_queue_end_tag(q, rq);
BUG_ON(blk_queued_rq(rq));
if (rq->cmd_flags & REQ_URGENT) {
/*
* It's not compliant with the design to re-insert
* urgent requests. We want to be able to track this
* down.
*/
pr_err("%s(): requeueing an URGENT request", __func__);
WARN_ON(!q->dispatched_urgent);
q->dispatched_urgent = false;
}
return elv_reinsert_request(q, rq);
}