From c76541a932113faa5b3be65a3f0a3d4ebbc86aeb Mon Sep 17 00:00:00 2001
From: Keith Busch <keith.busch@intel.com>
Date: Fri, 19 Dec 2014 17:54:13 -0700
Subject: [PATCH] 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>
---
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 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);