igb: fixup AER with proper error handling

Based on Peter Waskiewicz patch for ixgbe.  Add error handling based on
Hemminger's recommendation.
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: NPeter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/igb/igb_main.c

@@ -1050,7 +1050,12 @@ static int __devinit igb_probe(struct pci_dev *pdev,
 	if (err)
 		goto err_pci_reg;
 
-	pci_enable_pcie_error_reporting(pdev);
+	err = pci_enable_pcie_error_reporting(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "pci_enable_pcie_error_reporting failed "
+		        "0x%x\n", err);
+		/* non-fatal, continue */
+	}
 
 	pci_set_master(pdev);
 	pci_save_state(pdev);
@@ -1343,6 +1348,7 @@ static void __devexit igb_remove(struct pci_dev *pdev)
 #ifdef CONFIG_IGB_DCA
 	struct e1000_hw *hw = &adapter->hw;
 #endif
+	int err;
 
 	/* flush_scheduled work may reschedule our watchdog task, so
 	 * explicitly disable watchdog tasks from being rescheduled  */
@@ -1382,7 +1388,10 @@ static void __devexit igb_remove(struct pci_dev *pdev)
 
 	free_netdev(netdev);
 
-	pci_disable_pcie_error_reporting(pdev);
+	err = pci_disable_pcie_error_reporting(pdev);
+	if (err)
+		dev_err(&pdev->dev,
+		        "pci_disable_pcie_error_reporting failed 0x%x\n", err);
 
 	pci_disable_device(pdev);
 }
@@ -4495,7 +4504,12 @@ static pci_ers_result_t igb_io_slot_reset(struct pci_dev *pdev)
 		result = PCI_ERS_RESULT_RECOVERED;
 	}
 
-	pci_cleanup_aer_uncorrect_error_status(pdev);
+	err = pci_cleanup_aer_uncorrect_error_status(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "pci_cleanup_aer_uncorrect_error_status "
+		        "failed 0x%0x\n", err);
+		/* non-fatal, continue */
+	}
 
 	return result;
 }