# From Gerd Knorr - this avoids a network deadlock that can happen when the
# host side of an interface is full when the UML interface is brought up.
# In this case, SIGIOs will never be delivered since no new data is ever
# queued to the host side.
Index: um/arch/um/drivers/net_kern.c
===================================================================
--- um.orig/arch/um/drivers/net_kern.c	2004-09-10 12:12:55.000000000 -0400
+++ um/arch/um/drivers/net_kern.c	2004-09-10 12:13:04.000000000 -0400
@@ -128,6 +128,12 @@
 	spin_lock(&opened_lock);
 	list_add(&lp->list, &opened);
 	spin_unlock(&opened_lock);
+	 /* clear buffer - it can happen that the host side of the interface
+	  * is full when we get here.  In this case, new data is never queued,
+	  * SIGIOs never arrive, and the net never works.
+	  */
+	while((err = uml_net_rx(dev)) > 0) ;
+
 	MOD_INC_USE_COUNT;
  out:
 	spin_unlock(&lp->lock);