smsc9420: handle magic field of ethtool_eeprom
ethtool.h says the driver should set the magic field in get_eeprom and
verify it in set_eeprom. This patch adds this functionality using an
arbitary driver-specific magic value constant (0x9420).
Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/smsc9420.h b/drivers/net/smsc9420.h
index 69c351f..e441402 100644
--- a/drivers/net/smsc9420.h
+++ b/drivers/net/smsc9420.h
@@ -44,6 +44,7 @@
#define LAN_REGISTER_EXTENT (0x400)
#define SMSC9420_EEPROM_SIZE ((u32)11)
+#define SMSC9420_EEPROM_MAGIC (0x9420)
#define PKT_BUF_SZ (VLAN_ETH_FRAME_LEN + NET_IP_ALIGN + 4)