[PATCH 1/4] blk-mq: Exit queue on alloc failure

[Keith Busch]

Fixes usage counter when a request could not be allocated.

Signed-off-by: Keith Busch <keith.busch at intel.com>
---
 block/blk-mq.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 6cd94ba..68050ae 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);
-- 
1.7.10.4