8139cp: re-enable interrupts after tx timeout

commit 01ffc0a7 upstream.

Recovery doesn't work too well if we leave interrupts disabled...
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Acked-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Luis Henriques <luis.henriques@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/ethernet/realtek/8139cp.c

@@ -1232,6 +1232,7 @@ static void cp_tx_timeout(struct net_device *dev)
 	cp_clean_rings(cp);
 	rc = cp_init_rings(cp);
 	cp_start_hw(cp);
+	cp_enable_irq(cp);
 
 	netif_wake_queue(dev);