blkcg policy should keep cpd/pd's alloc_fn and free_fn in pairs, otherwise policy would register fail. Signed-off-by: weiping zhang <zhangweiping@xxxxxxxxxxxxxxx> --- block/blk-cgroup.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index e7ec676..6c5f5f3 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -1419,6 +1419,13 @@ int blkcg_policy_register(struct blkcg_policy *pol) if (i >= BLKCG_MAX_POLS) goto err_unlock; + /* Make sure cpd_alloc_fn and cpd_free_fn in pairs */ + if (!pol->cpd_alloc_fn ^ !pol->cpd_free_fn) + goto err_unlock; + + if (!pol->pd_alloc_fn ^ !pol->pd_free_fn) + goto err_unlock; + /* register @pol */ pol->plid = i; blkcg_policy[pol->plid] = pol; -- 2.9.4
