[PATCH 2.5.70] Tun device encapsulation

[Stephen Hemminger <shemminger@osdl.org>]

Tun device was encapsulating the net_device in a private structure then doing:
	unregister_netdev(&tun->dev);
	kfree(tun);
	rtnl_unlock();

This breaks with the delayed cleanup now in the network core.
Moving the kfree outside of the rtnl_unlock will fix it.

Builds, but not sure how to use TUN to test it.

As part of later refcounting changes, I do have a more complex change
that uses the same encapsulation as ethernet and other
devices.  Will save it for later.

diff -Nru a/drivers/net/tun.c b/drivers/net/tun.c
--- a/drivers/net/tun.c	Wed Jun  4 15:38:44 2003
+++ b/drivers/net/tun.c	Wed Jun  4 15:38:44 2003
@@ -551,10 +551,12 @@
 	if (!(tun->flags & TUN_PERSIST)) {
 		dev_close(&tun->dev);
 		unregister_netdevice(&tun->dev);
-		kfree(tun);
 	}
 
 	rtnl_unlock();
+
+	if (!(tun->flags & TUN_PERSIST)) 
+		kfree(tun);
 	return 0;
 }