[PATCH 1/2] net: introduce NETDEV_PRE_INIT notifier

[Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>]

For various purposes including a wireless extensions
bugfix, we need to hook into the netdev creation at
a point before netdev_register_kobject(). It seems
more generic, however, to have it even earlier. This
will also ease doing the dev type assignment that
Marcel was working on generically.

Signed-off-by: Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
---
 include/linux/notifier.h |    1 +
 net/core/dev.c           |    5 +++++
 2 files changed, 6 insertions(+)

--- wireless-testing.orig/include/linux/notifier.h	2009-09-27 15:09:10.000000000 +0200
+++ wireless-testing/include/linux/notifier.h	2009-09-27 15:10:19.000000000 +0200
@@ -199,6 +199,7 @@ static inline int notifier_to_errno(int 
 #define NETDEV_FEAT_CHANGE	0x000B
 #define NETDEV_BONDING_FAILOVER 0x000C
 #define NETDEV_PRE_UP		0x000D
+#define NETDEV_PRE_INIT		0x000E
 
 #define SYS_DOWN	0x0001	/* Notify of system down */
 #define SYS_RESTART	SYS_DOWN
--- wireless-testing.orig/net/core/dev.c	2009-09-27 15:09:56.000000000 +0200
+++ wireless-testing/net/core/dev.c	2009-09-27 15:11:40.000000000 +0200
@@ -4734,6 +4734,11 @@ int register_netdevice(struct net_device
 
 	dev->iflink = -1;
 
+	ret = call_netdevice_notifiers(NETDEV_PRE_INIT, dev);
+	ret = notifier_to_errno(ret);
+	if (ret)
+		goto out;
+
 	/* Init, if this function is available */
 	if (dev->netdev_ops->ndo_init) {
 		ret = dev->netdev_ops->ndo_init(dev);


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