tree 8d9c0a06d651b1b6429d8a4968570c0b0013115f
parent db06d759d6cf903aeda8c107fd3abd366dd80200
author Johannes Weiner <hannes@cmpxchg.org> 1466180639 -0400
committer Tejun Heo <tj@kernel.org> 1466187388 -0400

cgroup: fix idr leak for the first cgroup root

The valid cgroup hierarchy ID range includes 0, so we can't filter for
positive numbers when freeing it, or it'll leak the first ID. No big
deal, just disruptive when reading the code.

The ID is freed during error handling and when the reference count
hits zero, so the double-free test is not necessary; remove it.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Tejun Heo <tj@kernel.org>