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blk-mq: do not use blk_mq_alloc_request_pinned in blk_mq_map_request 

We already do a non-blocking allocation in blk_mq_map_request, no need
to repeat it.  Just call __blk_mq_alloc_request to wait directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2014-05-27 20:59:49 +02:00 committed by Jens Axboe
parent a3bd77567c
commit 793597a6a9
1 changed files with 5 additions and 3 deletions
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8
block/blk-mq.c
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@ -1179,12 +1179,14 @@ static struct request *blk_mq_map_request(struct request_queue *q,
trace_block_getrq(q, bio, rw);
rq = __blk_mq_alloc_request(q, hctx, ctx, rw, GFP_ATOMIC, false);
if (unlikely(!rq)) {
__blk_mq_run_hw_queue(hctx);
blk_mq_put_ctx(ctx);
trace_block_sleeprq(q, bio, rw);
rq = blk_mq_alloc_request_pinned(q, rw, __GFP_WAIT|GFP_ATOMIC,
false);
ctx = rq->mq_ctx;
ctx = blk_mq_get_ctx(q);
hctx = q->mq_ops->map_queue(q, ctx->cpu);
rq = __blk_mq_alloc_request(q, hctx, ctx, rw,
__GFP_WAIT|GFP_ATOMIC, false);
}
hctx->queued++;