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net: sched: cls_cgroup tear down exts and ematch from rcu callback

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It is not RCU safe to destroy the action chain while there
is a possibility of readers accessing it. Move this code
into the rcu callback using the same rcu callback used in the
code patch to make a change to head.

Signed-off-by: John Fastabend <[email protected]>
Acked-by: Cong Wang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
John Fastabend 2014-10-05 21:28:20 -07:00 • committed by David S. Miller
commit 13990f8156
1 changed files with 1 additions and 3 deletions
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4
net/sched/cls_cgroup.c
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@ -156,10 +156,8 @@ static void cls_cgroup_destroy(struct tcf_proto *tp)
struct cls_cgroup_head *head = rtnl_dereference(tp->root);
if (head) {
tcf_exts_destroy(&head->exts);
tcf_em_tree_destroy(&head->ematches);
RCU_INIT_POINTER(tp->root, NULL);
kfree_rcu(head, rcu);
call_rcu(&head->rcu, cls_cgroup_destroy_rcu);
}
}