ixgb: fix unload race with timers

ixgb needs to call flush scheduled work to flush any timers before
unregistering the netdev.
Signed-off-by: NJesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

drivers/net/ixgb/ixgb_main.c

@@ -528,6 +528,8 @@ ixgb_remove(struct pci_dev *pdev)
 	struct net_device *netdev = pci_get_drvdata(pdev);
 	struct ixgb_adapter *adapter = netdev_priv(netdev);
 
+	flush_scheduled_work();
+
 	unregister_netdev(netdev);
 
 	iounmap(adapter->hw.hw_addr);