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-rw-r--r--net/8021q/vlan_core.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index fcc684678af6..5940366fac48 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -63,6 +63,27 @@ bool vlan_do_receive(struct sk_buff **skbp)
return true;
}
+/* Must be invoked with rcu_read_lock or with RTNL. */
+struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
+ u16 vlan_id)
+{
+ struct vlan_group *grp = rcu_dereference_rtnl(real_dev->vlgrp);
+
+ if (grp) {
+ return vlan_group_get_device(grp, vlan_id);
+ } else {
+ /*
+ * Bonding slaves do not have grp assigned to themselves.
+ * Grp is assigned to bonding master instead.
+ */
+ if (netif_is_bond_slave(real_dev))
+ return __vlan_find_dev_deep(real_dev->master, vlan_id);
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(__vlan_find_dev_deep);
+
struct net_device *vlan_dev_real_dev(const struct net_device *dev)
{
return vlan_dev_info(dev)->real_dev;