blk-mq: get rid of manual run of queue with __blk_mq_run_hw_queue()

Two cases:

1) blk_mq_alloc_request() needlessly re-runs the queue, after
   calling into the tag allocation without NOWAIT set. We don't
   need to do that.

2) blk_mq_map_request() should just use blk_mq_run_hw_queue() with
   the async flag set to false.

Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

1 files changed, 2 insertions, 14 deletions

diff --git a/block/blk-mq.c b/block/blk-mq.c
index e0a69daddbd8..c29700010b5c 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -34,8 +34,6 @@
 static DEFINE_MUTEX(all_q_mutex);
 static LIST_HEAD(all_q_list);
 
-static void __blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx);
-
 /*
  * Check if any of the ctx's have pending work in this hardware queue
  */
@@ -228,19 +226,9 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
         ctx = blk_mq_get_ctx(q);
         hctx = q->mq_ops->map_queue(q, ctx->cpu);
         blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx);
-
         rq = __blk_mq_alloc_request(&alloc_data, rw, 0);
-        if (!rq && !(flags & BLK_MQ_REQ_NOWAIT)) {
-                __blk_mq_run_hw_queue(hctx);
-                blk_mq_put_ctx(ctx);
-
-                ctx = blk_mq_get_ctx(q);
-                hctx = q->mq_ops->map_queue(q, ctx->cpu);
-                blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx);
-                rq =  __blk_mq_alloc_request(&alloc_data, rw, 0);
-                ctx = alloc_data.ctx;
-        }
         blk_mq_put_ctx(ctx);
+
         if (!rq) {
                 blk_queue_exit(q);
                 return ERR_PTR(-EWOULDBLOCK);
@@ -1225,7 +1213,7 @@ static struct request *blk_mq_map_request(struct request_queue *q,
         blk_mq_set_alloc_data(&alloc_data, q, BLK_MQ_REQ_NOWAIT, ctx, hctx);
         rq = __blk_mq_alloc_request(&alloc_data, op, op_flags);
         if (unlikely(!rq)) {
-                __blk_mq_run_hw_queue(hctx);
+                blk_mq_run_hw_queue(hctx, false);
                 blk_mq_put_ctx(ctx);
                 trace_block_sleeprq(q, bio, op);