[PATCH 2.5.70] Tun device encapsulation

[Stephen Hemminger <shemminger@xxxxxxxx>]

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;
 }