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blkcg: blkcg_activate_policy() should initialize ancestors first

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When blkcg_activate_policy() is creating blkg_policy_data for existing
blkgs, it did in the wrong order - descendants first.  Fix it.  None
of the existing controllers seem affected by this.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2019-06-13 15:30:40 -07:00 committed by Jens Axboe
parent ef069b97fe
commit 71c814077d
1 changed files with 2 additions and 1 deletions
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3
block/blk-cgroup.c
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@ -1390,7 +1390,8 @@ int blkcg_activate_policy(struct request_queue *q,
spin_lock_irq(&q->queue_lock);
list_for_each_entry(blkg, &q->blkg_list, q_node) {
/* blkg_list is pushed at the head, reverse walk to init parents first */
list_for_each_entry_reverse(blkg, &q->blkg_list, q_node) {
struct blkg_policy_data *pd;
if (blkg->pd[pol->plid])