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>

1 files changed, 3 insertions, 1 deletions

diff --git a/block/blk-mq.c b/block/blk-mq.c
index da1ab5641227..bfe0f1f9cfa0 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);