netdevice: safe convert to netdev_priv() #part-3

We have some reasons to kill netdev->priv:
1. netdev->priv is equal to netdev_priv().
2. netdev_priv() wraps the calculation of netdev->priv's offset, obviously
   netdev_priv() is more flexible than netdev->priv.
But we cann't kill netdev->priv, because so many drivers reference to it
directly.

This patch is a safe convert for netdev->priv to netdev_priv(netdev).
Since all of the netdev->priv is only for read.
But it is too big to be sent in one mail.
I split it to 4 parts and make every part smaller than 100,000 bytes,
which is max size allowed by vger.

Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/usb/mcs7830.c b/drivers/net/usb/mcs7830.c
index b514350..bbcc76a 100644
--- a/drivers/net/usb/mcs7830.c
+++ b/drivers/net/usb/mcs7830.c
@@ -344,14 +344,14 @@
 static int mcs7830_mdio_read(struct net_device *netdev, int phy_id,
 			     int location)
 {
-	struct usbnet *dev = netdev->priv;
+	struct usbnet *dev = netdev_priv(netdev);
 	return mcs7830_read_phy(dev, location);
 }
 
 static void mcs7830_mdio_write(struct net_device *netdev, int phy_id,
 				int location, int val)
 {
-	struct usbnet *dev = netdev->priv;
+	struct usbnet *dev = netdev_priv(netdev);
 	mcs7830_write_phy(dev, location, val);
 }