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| author | Tejun Heo <tj@kernel.org> | 2019-06-13 15:30:40 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-06-15 10:39:40 -0600 |
| commit | 71c814077de60b2e7415dac6f5c4e98f59d521fd (patch) | |
| tree | e2c3740fdd60c8fb9fb50b2256f608f486916eb8 /block/blk-cgroup.c | |
| parent | ef069b97feec11c2399bbc5f6f347b35482105dc (diff) | |
| download | lwn-71c814077de60b2e7415dac6f5c4e98f59d521fd.tar.gz lwn-71c814077de60b2e7415dac6f5c4e98f59d521fd.zip | |
blkcg: blkcg_activate_policy() should initialize ancestors first
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>
Diffstat (limited to 'block/blk-cgroup.c')
| -rw-r--r-- | block/blk-cgroup.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 04d286934c5e..440797293235 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -1390,7 +1390,8 @@ pd_prealloc: 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]) |