[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, 3 insertions, 5 deletions

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index e13602d8154d..95daba624967 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -415,11 +415,9 @@ static void arp_reply(struct sk_buff *skb)
         send_skb->protocol = htons(ETH_P_ARP);
 
         /* Fill the device header for the ARP frame */
-
-        if (np->dev->hard_header &&
-            np->dev->hard_header(send_skb, skb->dev, ptype,
-                                 sha, np->local_mac,
-                                 send_skb->len) < 0) {
+        if (dev_hard_header(send_skb, skb->dev, ptype,
+                            sha, np->local_mac,
+                            send_skb->len) < 0) {
                 kfree_skb(send_skb);
                 return;
         }