sky2: netpoll on port 0 only

Netpoll will only work on port 0 because of the restrictive
relationship between NAPI and netpoll.
Signed-off-by: NStephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/sky2.c

@@ -3995,7 +3995,8 @@ static __devinit struct net_device *sky2_init_netdev(struct sky2_hw *hw,
 	dev->tx_timeout = sky2_tx_timeout;
 	dev->watchdog_timeo = TX_WATCHDOG;
 #ifdef CONFIG_NET_POLL_CONTROLLER
-	dev->poll_controller = sky2_netpoll;
+	if (port == 0)
+		dev->poll_controller = sky2_netpoll;
 #endif
 
 	sky2 = netdev_priv(dev);