netdev - [PATCH net 1/2] vlan: make vlan_dev_real

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Date:	Sat,  3 Aug 2013 22:07:46 +0200
From:	Nikolay Aleksandrov <nikolay@...hat.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, vfalico@...hat.com, fubar@...ibm.com,
	jhs@...atatu.com
Subject: [PATCH net 1/2] vlan: make vlan_dev_real_dev work over stacked vlans

From: Nikolay Aleksandrov <Nikolay Aleksandrov nikolay@...hat.com>

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 <nikolay@...hat.com>
---
 net/8021q/vlan_core.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 4a78c4d..6ee48aa 100644
--- 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);
 
-- 
1.8.1.4

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