ucc_geth: add support for netpoll

This patch adds netpoll support for the QE UCC Gigabit Ethernet
driver. Tested using netconsole and KGDBoE.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ucc_geth.c

@@ -3666,6 +3666,23 @@ static irqreturn_t ucc_geth_irq_handler(int irq, void *info)
 	return IRQ_HANDLED;
 }
 
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/*
+ * Polling 'interrupt' - used by things like netconsole to send skbs
+ * without having to re-enable interrupts. It's not called while
+ * the interrupt routine is executing.
+ */
+static void ucc_netpoll(struct net_device *dev)
+{
+	struct ucc_geth_private *ugeth = netdev_priv(dev);
+	int irq = ugeth->ug_info->uf_info.irq;
+
+	disable_irq(irq);
+	ucc_geth_irq_handler(irq, dev);
+	enable_irq(irq);
+}
+#endif /* CONFIG_NET_POLL_CONTROLLER */
+
 /* Called when something needs to use the ethernet device */
 /* Returns 0 for success. */
 static int ucc_geth_open(struct net_device *dev)
@@ -4008,6 +4025,9 @@ static int ucc_geth_probe(struct of_device* ofdev, const struct of_device_id *ma
 #ifdef CONFIG_UGETH_NAPI
 	netif_napi_add(dev, &ugeth->napi, ucc_geth_poll, UCC_GETH_DEV_WEIGHT);
 #endif				/* CONFIG_UGETH_NAPI */
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ucc_netpoll;
+#endif
 	dev->stop = ucc_geth_close;
 //    dev->change_mtu = ucc_geth_change_mtu;
 	dev->mtu = 1500;