vlan: make vlan_dev_real_dev work over stacked vlans

Sometimes we might have stacked vlans on top of each other, and we're interested in the first non-vlan real device on the path, so transform vlan_dev_real_dev to go over the stacked vlans and extract the first non-vlan device. Signed-off-by: Nikolay Aleksandrov <[email protected]> Signed-off-by: Veaceslav Falico <[email protected]> Signed-off-by: David S. Miller <[email protected]>
Baughn · Aug 5, 2013 · 0369722 · 0369722
1 parent d9af2d6
commit 0369722
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
@@ -91,7 +91,12 @@ EXPORT_SYMBOL(__vlan_find_dev_deep);
 
 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
 {
-	return vlan_dev_priv(dev)->real_dev;
+	struct net_device *ret = vlan_dev_priv(dev)->real_dev;
+
+	while (is_vlan_dev(ret))
+		ret = vlan_dev_priv(ret)->real_dev;
+
+	return ret;
 }
 EXPORT_SYMBOL(vlan_dev_real_dev);