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blk-mq: don't fail allocating driver tag for stopped hw queue

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We rely on blk_mq_get_driver_tag() not failing if 'wait' is true,
but it currently fails in that case if the queue happens to be
stopped at the time of the call.

We don't need to check for stopped here, it's just assigning
the tag. If the queue is stopped, we'll handle it when
attempting to run the queue.

This fixes a stall/crash on flush intensive workloads, where
we proceed to process a flush that doesn't have a valid tag
assigned.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jens Axboe 2017-01-31 23:32:50 -07:00
parent 7bf7d77862
commit 12d70958a2
1 changed files with 0 additions and 3 deletions
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3
block/blk-mq.c
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@ -856,9 +856,6 @@ bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx,
.flags = wait ? 0 : BLK_MQ_REQ_NOWAIT,
};
if (blk_mq_hctx_stopped(data.hctx))
return false;
if (rq->tag != -1) {
done:
if (hctx)