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-rw-r--r--net/sched/cls_route.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
index bb8a60235d01..08a3b0a6f5ab 100644
--- a/net/sched/cls_route.c
+++ b/net/sched/cls_route.c
@@ -277,13 +277,20 @@ route4_delete_filter(struct rcu_head *head)
kfree(f);
}
-static void route4_destroy(struct tcf_proto *tp)
+static bool route4_destroy(struct tcf_proto *tp, bool force)
{
struct route4_head *head = rtnl_dereference(tp->root);
int h1, h2;
if (head == NULL)
- return;
+ return true;
+
+ if (!force) {
+ for (h1 = 0; h1 <= 256; h1++) {
+ if (rcu_access_pointer(head->table[h1]))
+ return false;
+ }
+ }
for (h1 = 0; h1 <= 256; h1++) {
struct route4_bucket *b;
@@ -308,6 +315,7 @@ static void route4_destroy(struct tcf_proto *tp)
}
RCU_INIT_POINTER(tp->root, NULL);
kfree_rcu(head, rcu);
+ return true;
}
static int route4_delete(struct tcf_proto *tp, unsigned long arg)