The DMA api requires that the full mapping be sync'd when
copying frame. First found by Jarek on sky2.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>

--- a/drivers/net/sungem.c	2010-01-20 11:43:58.779387706 -0800
+++ b/drivers/net/sungem.c	2010-01-20 11:52:50.398529616 -0800
@@ -847,9 +847,13 @@ static int gem_rx(struct gem *gp, int wo
 
 			skb_reserve(copy_skb, 2);
 			skb_put(copy_skb, len);
-			pci_dma_sync_single_for_cpu(gp->pdev, dma_addr, len, PCI_DMA_FROMDEVICE);
+			pci_dma_sync_single_for_cpu(gp->pdev, dma_addr,
+						    RX_BUF_ALLOC_SIZE(gp),
+						    PCI_DMA_FROMDEVICE);
 			skb_copy_from_linear_data(skb, copy_skb->data, len);
-			pci_dma_sync_single_for_device(gp->pdev, dma_addr, len, PCI_DMA_FROMDEVICE);
+			pci_dma_sync_single_for_device(gp->pdev, dma_addr,
+						       RX_BUF_ALLOC_SIZE(gp),
+						       PCI_DMA_FROMDEVICE);
 
 			/* We'll reuse the original ring buffer. */
 			skb = copy_skb;

-- 

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