[NET]: Wrap netdevice hardware header creation.

Add inline for common usage of hardware header creation, and
fix bug in IPV6 mcast where the assumption about negative return is
an errno. Negative return from hard_header means not enough space
was available,(ie -N bytes).

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 2f6cdaa88729..a22087ca968d 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -170,8 +170,8 @@ static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
         const struct macvlan_dev *vlan = netdev_priv(dev);
         struct net_device *lowerdev = vlan->lowerdev;
 
-        return lowerdev->hard_header(skb, lowerdev, type, daddr,
-                                     saddr ? : dev->dev_addr, len);
+        return dev_hard_header(skb, lowerdev, type, daddr,
+                               saddr ? : dev->dev_addr, len);
 }
 
 static int macvlan_open(struct net_device *dev)