[PATCH] ethtool: allow const ethtool_ops

The ethtool_ops structure is immutable, it expected to be setup
by the driver and is never changed. This patch allows drivers to
declare there ethtool_ops structure read-only.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

include/linux/netdevice.h

@@ -342,7 +342,7 @@ struct net_device
 	/* Instance data managed by the core of Wireless Extensions. */
 	struct iw_public_data *	wireless_data;
 
-	struct ethtool_ops *ethtool_ops;
+	const struct ethtool_ops *ethtool_ops;
 
 	/*
 	 * This marks the end of the "visible" part of the structure. All

net/core/ethtool.c

@@ -143,7 +143,7 @@ static int ethtool_set_settings(struct net_device *dev, void __user *useraddr)
 static int ethtool_get_drvinfo(struct net_device *dev, void __user *useraddr)
 {
 	struct ethtool_drvinfo info;
-	struct ethtool_ops *ops = dev->ethtool_ops;
+	const struct ethtool_ops *ops = dev->ethtool_ops;
 
 	if (!ops->get_drvinfo)
 		return -EOPNOTSUPP;
@@ -169,7 +169,7 @@ static int ethtool_get_drvinfo(struct net_device *dev, void __user *useraddr)
 static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
 {
 	struct ethtool_regs regs;
-	struct ethtool_ops *ops = dev->ethtool_ops;
+	const struct ethtool_ops *ops = dev->ethtool_ops;
 	void *regbuf;
 	int reglen, ret;
 
@@ -282,7 +282,7 @@ static int ethtool_get_link(struct net_device *dev, void __user *useraddr)
 static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
 {
 	struct ethtool_eeprom eeprom;
-	struct ethtool_ops *ops = dev->ethtool_ops;
+	const struct ethtool_ops *ops = dev->ethtool_ops;
 	u8 *data;
 	int ret;
 
@@ -327,7 +327,7 @@ static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
 static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
 {
 	struct ethtool_eeprom eeprom;
-	struct ethtool_ops *ops = dev->ethtool_ops;
+	const struct ethtool_ops *ops = dev->ethtool_ops;
 	u8 *data;
 	int ret;
 
@@ -640,7 +640,7 @@ static int ethtool_set_gso(struct net_device *dev, char __user *useraddr)
 static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
 {
 	struct ethtool_test test;
-	struct ethtool_ops *ops = dev->ethtool_ops;
+	const struct ethtool_ops *ops = dev->ethtool_ops;
 	u64 *data;
 	int ret;
 
@@ -673,7 +673,7 @@ static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
 static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
 {
 	struct ethtool_gstrings gstrings;
-	struct ethtool_ops *ops = dev->ethtool_ops;
+	const struct ethtool_ops *ops = dev->ethtool_ops;
 	u8 *data;
 	int ret;
 
@@ -733,7 +733,7 @@ static int ethtool_phys_id(struct net_device *dev, void __user *useraddr)
 static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
 {
 	struct ethtool_stats stats;
-	struct ethtool_ops *ops = dev->ethtool_ops;
+	const struct ethtool_ops *ops = dev->ethtool_ops;
 	u64 *data;
 	int ret;