Fix natsemi net driver rx-related hang, by polling for RX events

on all RX interrupts.  Prior to this fix, RX FIFO overrun and RX
buffer overrun interrupts did not trigger an RX poll; now they do.

Contributor: Manfred Spraul

drivers/net/natsemi.c

@@ -1515,7 +1515,7 @@ static void intr_handler(int irq, void *dev_instance, struct pt_regs *rgs)
 		if (intr_status == 0)
 			break;
 
-		if (intr_status & (IntrRxDone | IntrRxIntr))
+		if (intr_status & (IntrRxDone | IntrRxIntr | RxStatusFIFOOver | IntrRxErr | IntrRxOverrun ))
 			netdev_rx(dev);
 
 		if (intr_status & (IntrTxDone | IntrTxIntr | IntrTxIdle | IntrTxErr) ) {