linux-kernel - [PATCH 08/13] dev->priv to netdev_priv(dev), for drivers/net/netxen

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Date:	Fri, 3 Aug 2007 19:34:30 +0200 (MEST)
From:	Yoann Padioleau <padator@...adoo.fr>
To:	kernel-janitors@...r.kernel.org
Cc:	amitkale@...xen.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 08/13] dev->priv to netdev_priv(dev), for drivers/net/netxen


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@...adoo.fr>
Cc: amitkale@...xen.com
Cc: akpm@...ux-foundation.org
---

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

diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 08a62ac..c14c178 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -329,7 +329,7 @@ netxen_nic_probe(struct pci_dev *pdev, c
 	SET_MODULE_OWNER(netdev);
 	SET_NETDEV_DEV(netdev, &pdev->dev);
 
-	adapter = netdev->priv;
+	adapter = netdev_priv(netdev);
 	memset(adapter, 0 , sizeof(struct netxen_adapter));
 
 	adapter->ahw.pdev = pdev;
@@ -850,7 +850,7 @@ static void __devexit netxen_nic_remove(
  */
 static int netxen_nic_open(struct net_device *netdev)
 {
-	struct netxen_adapter *adapter = (struct netxen_adapter *)netdev->priv;
+	struct netxen_adapter *adapter = netdev_priv(netdev);
 	int err = 0;
 	int ctx, ring;
 

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