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>

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>
Steve Glendinning · David S. Miller
1 parent 62660e2808
Showing 2 changed files with 5 additions and 0 deletions Side-by-side Diff
drivers/net/smsc9420.c
drivers/net/smsc9420.h
@@ -413,6 +413,7 @@
 	}
  
 	memcpy(data, &eeprom_data[eeprom->offset], len);
+	eeprom->magic = SMSC9420_EEPROM_MAGIC;
 	eeprom->len = len;
 	return 0;
 }
@@ -422,6 +423,9 @@
 {
 	struct smsc9420_pdata *pd = netdev_priv(dev);
 	int ret;
+
+	if (eeprom->magic != SMSC9420_EEPROM_MAGIC)
+		return -EINVAL;
  
 	smsc9420_eeprom_enable_access(pd);
 	smsc9420_eeprom_send_cmd(pd, E2P_CMD_EPC_CMD_EWEN_);
@@ -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)
...	...	@@ -413,6 +413,7 @@
413	413	}
414	414
415	415	memcpy(data, &eeprom_data[eeprom->offset], len);
	416	+ eeprom->magic = SMSC9420_EEPROM_MAGIC;
416	417	eeprom->len = len;
417	418	return 0;
418	419	}
...	...	@@ -422,6 +423,9 @@
422	423	{
423	424	struct smsc9420_pdata *pd = netdev_priv(dev);
424	425	int ret;
	426	+
	427	+ if (eeprom->magic != SMSC9420_EEPROM_MAGIC)
	428	+ return -EINVAL;
425	429
426	430	smsc9420_eeprom_enable_access(pd);
427	431	smsc9420_eeprom_send_cmd(pd, E2P_CMD_EPC_CMD_EWEN_);
...	...	@@ -44,6 +44,7 @@
44	44	#define LAN_REGISTER_EXTENT (0x400)
45	45
46	46	#define SMSC9420_EEPROM_SIZE ((u32)11)
	47	+#define SMSC9420_EEPROM_MAGIC (0x9420)
47	48
48	49	#define PKT_BUF_SZ (VLAN_ETH_FRAME_LEN + NET_IP_ALIGN + 4)
49	50