[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>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 50a4719..a2e7473 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -342,7 +342,7 @@
 	/* 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