Problem found: kaweth fails to work on 2.6.12-rc[456]

[Wakko Warner <wakko@animx.eu.org>]

After doing some testing, I believe a patch that went into rc4 broke kaweth.
The kaweth driver itself did not change from rc2 through rc6.

As a test, I reverted a patch that went into rc4 which modified
net/core/link_watch.c.  Once I compiled the kernel, my netgear EA101 works
again.

The following is the patch that caused it to stop working:
--- BEGIN PATCH ---
diff -urN linux-2.6.12-rc3/net/core/link_watch.c linux-2.6.12-rc4/net/core/link_watch.c
--- linux-2.6.12-rc3/net/core/link_watch.c	2005-03-01 23:37:30.000000000 -0800
+++ linux-2.6.12-rc4/net/core/link_watch.c	2005-05-06 22:59:27.439802792 -0700
@@ -74,6 +75,12 @@
 		clear_bit(__LINK_STATE_LINKWATCH_PENDING, &dev->state);
 
 		if (dev->flags & IFF_UP) {
+			if (netif_carrier_ok(dev)) {
+				WARN_ON(dev->qdisc_sleeping == &noop_qdisc);
+				dev_activate(dev);
+			} else
+				dev_deactivate(dev);
+
 			netdev_state_change(dev);
 		}
 
--- END PATCH ---
The above is not cut'n'paste.  There was 1 other addition (an include) that
I removed from the patch inorder to revert it.  The patch above was applied
to 2.6.12-rc6 using -Rp1.  This is why I believe that kaweth is broken. 
With my limited understanding of the kernel, it would appear that kaweth
doesn't support netif_carrier_ok properly.  
Anyway, I found what caused it to break, but at this point, I do not have
the required knowledge to do a proper fix.

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