myri10ge: check that we can get an irq

Now that IRQ allocation is done in myri10ge_open(), we want to still
check when loading the driver that IRQ allocation could succeed later.

Additionaly, we fix the initialization and printing of netdev->irq.
Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/myri10ge/myri10ge.c

@@ -2882,7 +2882,6 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	netdev->hard_start_xmit = myri10ge_xmit;
 	netdev->get_stats = myri10ge_get_stats;
 	netdev->base_addr = mgp->iomem_base;
-	netdev->irq = pdev->irq;
 	netdev->change_mtu = myri10ge_change_mtu;
 	netdev->set_multicast_list = myri10ge_set_multicast_list;
 	netdev->set_mac_address = myri10ge_set_mac_address;
@@ -2892,6 +2891,15 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	netdev->poll = myri10ge_poll;
 	netdev->weight = myri10ge_napi_weight;
 
+	/* make sure we can get an irq, and that MSI can be
+	 * setup (if available).  Also ensure netdev->irq
+	 * is set to correct value if MSI is enabled */
+	status = myri10ge_request_irq(mgp);
+	if (status != 0)
+		goto abort_with_firmware;
+	netdev->irq = pdev->irq;
+	myri10ge_free_irq(mgp);
+
 	/* Save configuration space to be restored if the
 	 * nic resets due to a parity error */
 	pci_save_state(pdev);
@@ -2907,8 +2915,9 @@ static int myri10ge_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		dev_err(&pdev->dev, "register_netdev failed: %d\n", status);
 		goto abort_with_state;
 	}
-	dev_info(dev, "%d, tx bndry %d, fw %s, WC %s\n",
-		 pdev->irq, mgp->tx.boundary, mgp->fw_name,
+	dev_info(dev, "%s IRQ %d, tx bndry %d, fw %s, WC %s\n",
+		 (mgp->msi_enabled ? "MSI" : "xPIC"),
+		 netdev->irq, mgp->tx.boundary, mgp->fw_name,
 		 (mgp->mtrr >= 0 ? "Enabled" : "Disabled"));
 
 	return 0;