From: Yu Kuai <yukuai3@huawei.com>
Date: Tue, 3 Jan 2023 11:28:33 +0000 (+0800)
Subject: blk-cgroup: fix missing pd_online_fn() while activating policy
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=a4a1af9fa08ef5425c2aee4e4f6534ae18df7153;p=users%2Fjedix%2Flinux-maple.git

blk-cgroup: fix missing pd_online_fn() while activating policy

[ Upstream commit e3ff8887e7db757360f97634e0d6f4b8e27a8c46 ]

If the policy defines pd_online_fn(), it should be called after
pd_init_fn(), like blkg_create().

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20230103112833.2013432-1-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index fcf9cf49f5de1..7c91d9195da8d 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1408,6 +1408,10 @@ retry:
 		list_for_each_entry_reverse(blkg, &q->blkg_list, q_node)
 			pol->pd_init_fn(blkg->pd[pol->plid]);
 
+	if (pol->pd_online_fn)
+		list_for_each_entry_reverse(blkg, &q->blkg_list, q_node)
+			pol->pd_online_fn(blkg->pd[pol->plid]);
+
 	__set_bit(pol->plid, q->blkcg_pols);
 	ret = 0;