[PATCH] Fix netdev close

This should fix the "ifconfig down ...  ifconfig up" problems some
people have seen.

net/core/dev.c

@@ -841,7 +841,11 @@ int dev_close(struct net_device *dev)
 	 * engine, but this requires more changes in devices. */
 
 	smp_mb__after_clear_bit(); /* Commit netif_running(). */
-	netif_poll_disable(dev);
+	while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
+		/* No hurry. */
+		current->state = TASK_INTERRUPTIBLE;
+		schedule_timeout(1);
+	}
 
 	/*
 	 *	Call the device specific close. This cannot fail.