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-rw-r--r--net/sched/cls_u32.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index a0e6fac613de..66c6bcec16cb 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -1108,10 +1108,33 @@ erridr:
return err;
}
+static bool u32_hnode_empty(struct tc_u_hnode *ht, bool *non_root_ht)
+{
+ int i;
+
+ if (!ht)
+ return true;
+ if (!ht->is_root) {
+ *non_root_ht = true;
+ return false;
+ }
+ if (*non_root_ht)
+ return false;
+ if (ht->refcnt < 2)
+ return true;
+
+ for (i = 0; i <= ht->divisor; i++) {
+ if (rtnl_dereference(ht->ht[i]))
+ return false;
+ }
+ return true;
+}
+
static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg,
bool rtnl_held)
{
struct tc_u_common *tp_c = tp->data;
+ bool non_root_ht = false;
struct tc_u_hnode *ht;
struct tc_u_knode *n;
unsigned int h;
@@ -1124,6 +1147,8 @@ static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg,
ht = rtnl_dereference(ht->next)) {
if (ht->prio != tp->prio)
continue;
+ if (u32_hnode_empty(ht, &non_root_ht))
+ return;
if (arg->count >= arg->skip) {
if (arg->fn(tp, ht, arg) < 0) {
arg->stop = 1;