From: Keith Busch <keith.busch@intel.com>
Date: Sat, 20 Dec 2014 00:54:13 +0000 (-0700)
Subject: blk-mq: Exit queue on alloc failure
X-Git-Tag: v4.9.8~4823^2~28
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c76541a932113faa5b3be65a3f0a3d4ebbc86aeb;p=platform%2Fkernel%2Flinux-rpi3.git

blk-mq: Exit queue on alloc failure

Fixes usage counter when a request could not be allocated.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
---

diff --git a/block/blk-mq.c b/block/blk-mq.c
index da1ab56..bfe0f1f9 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -258,8 +258,10 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp,
 		ctx = alloc_data.ctx;
 	}
 	blk_mq_put_ctx(ctx);
-	if (!rq)
+	if (!rq) {
+		blk_mq_queue_exit(q);
 		return ERR_PTR(-EWOULDBLOCK);
+	}
 	return rq;
 }
 EXPORT_SYMBOL(blk_mq_alloc_request);