net: macb: Re-enable RX interrupt only when RX is done

When data is received during the driver processing received data the
NAPI is re-scheduled. In that case the RX interrupt should not be
re-enabled.
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cadence/macb.c

@@ -891,16 +891,15 @@ static int macb_poll(struct napi_struct *napi, int budget)
 	if (work_done < budget) {
 		napi_complete(napi);
 
-		/*
-		 * We've done what we can to clean the buffers. Make sure we
-		 * get notified when new packets arrive.
-		 */
-		macb_writel(bp, IER, MACB_RX_INT_FLAGS);
-
 		/* Packets received while interrupts were disabled */
 		status = macb_readl(bp, RSR);
-		if (unlikely(status))
+		if (unlikely(status)) {
+			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+				macb_writel(bp, ISR, MACB_BIT(RCOMP));
 			napi_reschedule(napi);
+		} else {
+			macb_writel(bp, IER, MACB_RX_INT_FLAGS);
+		}
 	}
 
 	/* TODO: Handle errors */