[NET]: Move hardware header operations out of netdevice.

Since hardware header operations are part of the protocol class
not the device instance, make them into a separate object and
save memory.

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

1 files changed, 4 insertions, 6 deletions

diff --git a/drivers/net/wan/hdlc.c b/drivers/net/wan/hdlc.c
index ee23b91f23d9..d553e6f32851 100644
--- a/drivers/net/wan/hdlc.c
+++ b/drivers/net/wan/hdlc.c
@@ -232,6 +232,8 @@ int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
         return -EINVAL;
 }
 
+static const struct header_ops hdlc_null_ops;
+
 static void hdlc_setup_dev(struct net_device *dev)
 {
         /* Re-init all variables changed by HDLC protocol drivers,
@@ -243,13 +245,9 @@ static void hdlc_setup_dev(struct net_device *dev)
         dev->type                = ARPHRD_RAWHDLC;
         dev->hard_header_len     = 16;
         dev->addr_len            = 0;
-        dev->hard_header         = NULL;
-        dev->rebuild_header      = NULL;
-        dev->set_mac_address     = NULL;
-        dev->hard_header_cache   = NULL;
-        dev->header_cache_update = NULL;
+        dev->header_ops          = &hdlc_null_ops;
+
         dev->change_mtu          = hdlc_change_mtu;
-        dev->hard_header_parse   = NULL;
 }
 
 static void hdlc_setup(struct net_device *dev)