linux-kernel - [PATCH 1/7 v2] blk-mq: fix use of incorrect goto label in blk_mq_init

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Date:	Thu, 12 Mar 2015 10:27:30 -0400
From:	Mike Snitzer <snitzer@...hat.com>
To:	Jens Axboe <axboe@...nel.dk>, Keith Busch <keith.busch@...el.com>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	dm-devel@...hat.com, Ming Lei <ming.lei@...onical.com>
Subject: [PATCH 1/7 v2] blk-mq: fix use of incorrect goto label in
 blk_mq_init_queue error path

If percpu_ref_init() fails the 'err_hctxs' label should be used instead
of 'err_map'.

Rather than reuse 'err_hw', which was introduced if the later
blk_mq_init_hw_queues() call fails, move percpu_ref_init() before
blk_alloc_queue_node().

Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Reviewed-by: Ming Lei <ming.lei@...onical.com>
---
 block/blk-mq.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 4f4bea2..0a877d2 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1928,17 +1928,17 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
 		hctxs[i]->queue_num = i;
 	}
 
-	q = blk_alloc_queue_node(GFP_KERNEL, set->numa_node);
-	if (!q)
-		goto err_hctxs;
-
 	/*
 	 * Init percpu_ref in atomic mode so that it's faster to shutdown.
 	 * See blk_register_queue() for details.
 	 */
 	if (percpu_ref_init(&q->mq_usage_counter, blk_mq_usage_counter_release,
 			    PERCPU_REF_INIT_ATOMIC, GFP_KERNEL))
-		goto err_map;
+		goto err_hctxs;
+
+	q = blk_alloc_queue_node(GFP_KERNEL, set->numa_node);
+	if (!q)
+		goto err_hctxs;
 
 	setup_timer(&q->timeout, blk_mq_rq_timer, (unsigned long) q);
 	blk_queue_rq_timeout(q, 30000);
-- 
1.9.5 (Apple Git-50.3)

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