ixgbe: save and restore pcie/msi state to support EEH recovery

To enable EEH support for pci-express network adapters, pcie/msi state
needs to be saved and restored for that adapter.

Tested this EEH patch with Intel 10G pci-express ixgbe adapter.

Signed-off-by: Wendy Xiong <[e-mail]>
Signed-off-by: Auke Kok <[e-mail]>
Signed-off-by: Jeff Garzik <[e-mail]>

drivers/net/ixgbe/ixgbe_main.c

···
 	}
 
 	pci_set_master(pdev);
+	pci_save_state(pdev);
 
 #ifdef CONFIG_NETDEVICES_MULTIQUEUE
 	netdev = alloc_etherdev_mq(sizeof(struct ixgbe_adapter), MAX_TX_QUEUES);
···
 		return PCI_ERS_RESULT_DISCONNECT;
 	}
 	pci_set_master(pdev);
+	pci_restore_state(pdev);
 
 	pci_enable_wake(pdev, PCI_D3hot, 0);
 	pci_enable_wake(pdev, PCI_D3cold, 0);