dev->priv to netdev_priv(dev), drivers/net/tokenring/

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)

PS: I have performed the same transformation on the whole kernel
and it affects around 70 files, most of them in drivers/net/.
Should I split my patch for each subnet directories ? (wireless/, wan/, etc)

Thanks to Thomas Surrel for helping me refining my semantic patch.

Signed-off-by: Yoann Padioleau <padator@wanadoo.fr>

 3c359.c       |   58 +++++++++++++++++++++++++++++-----------------------------
 ibmtr.c       |   38 +++++++++++++++++++-------------------
 lanstreamer.c |   32 ++++++++++++++++----------------
 madgemc.c     |    4 ++--
 olympic.c     |   36 ++++++++++++++++++------------------
 tmspci.c      |    4 ++--
 6 files changed, 86 insertions(+), 86 deletions(-)
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/tokenring/madgemc.c b/drivers/net/tokenring/madgemc.c
index f8f4d74f01f1..9eafc2e25abc 100644
--- a/drivers/net/tokenring/madgemc.c
+++ b/drivers/net/tokenring/madgemc.c
@@ -690,7 +690,7 @@ static int madgemc_close(struct net_device *dev)
 static int madgemc_mcaproc(char *buf, int slot, void *d) 
 {	
 	struct net_device *dev = (struct net_device *)d;
-	struct net_local *tp = dev->priv;
+	struct net_local *tp = netdev_priv(dev);
 	struct card_info *curcard = tp->tmspriv;
 	int len = 0;
 	
@@ -736,7 +736,7 @@ static int __devexit madgemc_remove(struct device *device)
 
 	BUG_ON(!dev);
 
-	tp = dev->priv;
+	tp = netdev_priv(dev);
 	card = tp->tmspriv;
 	kfree(card);
 	tp->tmspriv = NULL;