1 files changed, 17 insertions, 18 deletions

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index ca97005e24b4..e9daa072ebb4 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -599,25 +599,16 @@ static void gem_rx_refill(struct macb *bp)
 {
 	unsigned int		entry;
 	struct sk_buff		*skb;
-	struct macb_dma_desc	*desc;
 	dma_addr_t		paddr;
 
 	while (CIRC_SPACE(bp->rx_prepared_head, bp->rx_tail, RX_RING_SIZE) > 0) {
-		u32 addr, ctrl;
-
 		entry = macb_rx_ring_wrap(bp->rx_prepared_head);
-		desc = &bp->rx_ring[entry];
 
 		/* Make hw descriptor updates visible to CPU */
 		rmb();
 
-		addr = desc->addr;
-		ctrl = desc->ctrl;
 		bp->rx_prepared_head++;
 
-		if ((addr & MACB_BIT(RX_USED)))
-			continue;
-
 		if (bp->rx_skbuff[entry] == NULL) {
 			/* allocate sk_buff for this free entry in ring */
 			skb = netdev_alloc_skb(bp->dev, bp->rx_buffer_size);
@@ -698,7 +689,6 @@ static int gem_rx(struct macb *bp, int budget)
 		if (!(addr & MACB_BIT(RX_USED)))
 			break;
 
-		desc->addr &= ~MACB_BIT(RX_USED);
 		bp->rx_tail++;
 		count++;
 
@@ -891,16 +881,15 @@ 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 (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 */
@@ -951,6 +940,10 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id)
 		if (unlikely(status & (MACB_TX_ERR_FLAGS))) {
 			macb_writel(bp, IDR, MACB_TX_INT_FLAGS);
 			schedule_work(&bp->tx_error_task);
+
+			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+				macb_writel(bp, ISR, MACB_TX_ERR_FLAGS);
+
 			break;
 		}
 
@@ -968,6 +961,9 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id)
 				bp->hw_stats.gem.rx_overruns++;
 			else
 				bp->hw_stats.macb.rx_overruns++;
+
+			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+				macb_writel(bp, ISR, MACB_BIT(ISR_ROVR));
 		}
 
 		if (status & MACB_BIT(HRESP)) {
@@ -977,6 +973,9 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id)
 			 * (work queue?)
 			 */
 			netdev_err(dev, "DMA bus error: HRESP not OK\n");
+
+			if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+				macb_writel(bp, ISR, MACB_BIT(HRESP));
 		}
 
 		status = macb_readl(bp, ISR);
@@ -1113,7 +1112,7 @@ static void gem_free_rx_buffers(struct macb *bp)
 
 		desc = &bp->rx_ring[i];
 		addr = MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr));
-		dma_unmap_single(&bp->pdev->dev, addr, skb->len,
+		dma_unmap_single(&bp->pdev->dev, addr, bp->rx_buffer_size,
 				 DMA_FROM_DEVICE);
 		dev_kfree_skb_any(skb);
 		skb = NULL;