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| author | Omar Sandoval <osandov@fb.com> | 2017-03-28 16:12:17 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-03-29 08:09:08 -0600 |
| commit | 02ba8893ac9aa34fcb4ce2a9baef5615b190335a (patch) | |
| tree | 772bf87a8074d74b8748e878249568627a2cce0b | |
| parent | 0c9539a431bd4e4cbe475eb17e587f3ac06f2ae2 (diff) | |
| download | linux-02ba8893ac9aa34fcb4ce2a9baef5615b190335a.tar.gz linux-02ba8893ac9aa34fcb4ce2a9baef5615b190335a.tar.bz2 linux-02ba8893ac9aa34fcb4ce2a9baef5615b190335a.zip | |
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 <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/blk-sysfs.c | 4 |
1 files changed, 3 insertions, 1 deletions
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); |