[PATCH 3.19 016/101] blk-mq: fix use of incorrect goto label in blk_mq_init_queue error path

Greg Kroah-Hartman
2015-04-17T13:35:44Z

From: Mike Snitzer <snitzer@redhat.com>

commit 9a30b096b543932de218dd3501b5562e00a8792d upstream.

If percpu_ref_init() fails the allocated q and hctxs must get cleaned
up; using 'err_map' doesn't allow that to happen.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
block/blk-mq.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1937,7 +1937,7 @@ struct request_queue *blk_mq_init_queue(
*/
if (percpu_ref_init(&q->mq_usage_counter, blk_mq_usage_counter_release,
PERCPU_REF_INIT_ATOMIC, GFP_KERNEL))
- goto err_map;
+ goto err_mq_usage;

setup_timer(&q->timeout, blk_mq_rq_timer, (unsigned long) q);
blk_queue_rq_timeout(q, 30000);
@@ -1980,7 +1980,7 @@ struct request_queue *blk_mq_init_queue(
blk_mq_init_cpu_queues(q, set->nr_hw_queues);

if (blk_mq_init_hw_queues(q, set))
- goto err_hw;
+ goto err_mq_usage;

mutex_lock(&all_q_mutex);
list_add_tail(&q->all_q_node, &all_q_list);
@@ -1992,7 +1992,7 @@ struct request_queue *blk_mq_init_queue(

return q;

-err_hw:
+err_mq_usage:
blk_cleanup_queue(q);
err_hctxs:
kfree(map);