From 02ba8893ac9aa34fcb4ce2a9baef5615b190335a Mon Sep 17 00:00:00 2001 From: Omar Sandoval Date: Tue, 28 Mar 2017 16:12:17 -0700 Subject: [PATCH] block: fix leak of q->rq_wb CONFIG_DEBUG_TEST_DRIVER_REMOVE found a possible leak of q->rq_wb when a request queue is reregistered. This has been a problem since wbt was introduced, but the WARN_ON(!list_empty(&stats->callbacks)) in the blk-stat rework exposed it. Fix it by cleaning up wbt when we unregister the queue. Fixes: 87760e5eef35 ("block: hook up writeback throttling") Signed-off-by: Omar Sandoval Signed-off-by: Jens Axboe --- block/blk-sysfs.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 833fb7f9ce9d..45854266e398 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -795,7 +795,6 @@ static void blk_release_queue(struct kobject *kobj) struct request_queue *q = container_of(kobj, struct request_queue, kobj); - wbt_exit(q); if (test_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags)) blk_stat_remove_callback(q, q->poll_cb); blk_stat_free_callback(q->poll_cb); @@ -938,6 +937,9 @@ void blk_unregister_queue(struct gendisk *disk) queue_flag_clear_unlocked(QUEUE_FLAG_REGISTERED, q); + wbt_exit(q); + + if (q->mq_ops) blk_mq_unregister_dev(disk_to_dev(disk), q); -- 2.20.1