[PATCH 11/13] dev->priv to netdev_priv(dev), for drivers/net/usb

[Yoann Padioleau]

Replacing accesses to dev->priv to netdev_priv(dev). The replacment
is safe when netdev_priv is used to access a private structure that is
right next to the net_device structure in memory. Cf
http://groups.google.com/group/comp.os.linux.development.system/browse_thread/thread/de19321bcd94dbb8/0d74a4adcd6177bd
This is the case when the net_device structure was allocated with
a call to alloc_netdev or one of its derivative.

Here is an excerpt of the semantic patch that performs the transformation

@ rule1 @
type T;
struct net_device *dev;
@@

 dev = 
(
        alloc_netdev
|         
        alloc_etherdev
|
        alloc_trdev
)
   (sizeof(T), ...)

@ rule1bis @
struct net_device *dev;
expression E;
@@
 dev->priv = E

@ rule2 depends on rule1 && !rule1bis  @
struct net_device *dev;
type rule1.T;
@@

- (T*) dev->priv
+ netdev_priv(dev)

Signed-off-by: Yoann Padioleau <padator@xxxxxxxxxx>
Cc: greg@xxxxxxxxx
Cc: akpm@xxxxxxxxxxxxxxxxxxxx
---

 drivers/net/usb/mcs7830.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/mcs7830.c b/drivers/net/usb/mcs7830.c
index 6240b97..37ad14b 100644
--- a/drivers/net/usb/mcs7830.c
+++ b/drivers/net/usb/mcs7830.c
@@ -341,14 +341,14 @@ out:
 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);
 }
 

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