staging: et131x: Bugfix - driver doesn't autoreneg after cable unplug/plug events

This driver has a long standing bug where removing and inserting the ethernet cable results in no packets being
trnasmitted / received and hence no autonegotiation occurring.

Fixed by resetting the rx/tx engines and queue on detecting a cable being removed.
Signed-off-by: NMark Einon <mark.einon@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/et131x/et131x_initpci.c

@@ -544,6 +544,10 @@ static void et131x_adjust_link(struct net_device *netdev)
 
 			/* Setup ET1310 as per the documentation */
 			et131x_adapter_setup(adapter);
+
+			/* perform reset of tx/rx */
+			et131x_disable_txrx(netdev);
+			et131x_enable_txrx(netdev);
 		}
 
 		adapter->link = phydev->link;