Merge branch 'tc-filter-cleanup-destroy-delete'

Cong Wang says:

====================
net_sched: clean up tc filter destroy and delete logic

The first patch fixes a potenial race condition, the second one
is pure cleanup.
====================

Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 6 deletions

diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c
index 422414f16b38..c4fd63a068f9 100644
--- a/net/sched/cls_basic.c
+++ b/net/sched/cls_basic.c
@@ -93,30 +93,28 @@ static void basic_delete_filter(struct rcu_head *head)
 	kfree(f);
 }
 
-static bool basic_destroy(struct tcf_proto *tp, bool force)
+static void basic_destroy(struct tcf_proto *tp)
 {
 	struct basic_head *head = rtnl_dereference(tp->root);
 	struct basic_filter *f, *n;
 
-	if (!force && !list_empty(&head->flist))
-		return false;
-
 	list_for_each_entry_safe(f, n, &head->flist, link) {
 		list_del_rcu(&f->link);
 		tcf_unbind_filter(tp, &f->res);
 		call_rcu(&f->rcu, basic_delete_filter);
 	}
 	kfree_rcu(head, rcu);
-	return true;
 }
 
-static int basic_delete(struct tcf_proto *tp, unsigned long arg)
+static int basic_delete(struct tcf_proto *tp, unsigned long arg, bool *last)
 {
+	struct basic_head *head = rtnl_dereference(tp->root);
 	struct basic_filter *f = (struct basic_filter *) arg;
 
 	list_del_rcu(&f->link);
 	tcf_unbind_filter(tp, &f->res);
 	call_rcu(&f->rcu, basic_delete_filter);
+	*last = list_empty(&head->flist);
 	return 0;
 }