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block: do not notify urgent request, when flush with data in flight 

MMC device driver implements URGENT request execution with priority
(using stop flow), as a result currently running (and prepeared) request
may be reinserted back into I/O scheduler. This will break block layer
logic of flushes (flush request should not be inserted into I/O scheduler).

Block layer flush machinery keep q->flush_data_in_flight list updated with
started but not completed flush requests with data (REQ_FUA).

This change will not notify underling block device driver about pending
urgent request during flushes in flight.

Change-Id: I98113621223fe0c7d224de023db888a73bd62b48
Signed-off-by: Konstantin Dorfman <kdorfman@codeaurora.org>
This commit is contained in:
Konstantin Dorfman 2014-01-05 14:36:26 +02:00
parent 8f2e06ac62
commit 552431dbf2
1 changed files with 2 additions and 1 deletions
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block/blk-core.c
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@ -312,7 +312,8 @@ inline void __blk_run_queue_uncond(struct request_queue *q)
if (!q->notified_urgent &&
q->elevator->type->ops.elevator_is_urgent_fn &&
q->urgent_request_fn &&
q->elevator->type->ops.elevator_is_urgent_fn(q)) {
q->elevator->type->ops.elevator_is_urgent_fn(q) &&
list_empty(&q->flush_data_in_flight)) {
q->notified_urgent = true;
q->urgent_request_fn(q);
} else