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..bfe0f1f 100644 (file)
--- 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);