sis190: fix for x86_64 (bug 11509)

Corrected dma sync handling on small packets. Should fix
http://bugzilla.kernel.org/show_bug.cgi?id=11509
Note:
While this bug was reported only on x86_64, it could have affected
any architecture.
Signed-off-by: Riccardo Ghetta <birrachiara@tin.it>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/sis190.c

@@ -539,8 +539,8 @@ static bool sis190_try_rx_copy(struct sis190_private *tp,
 	if (!skb)
 		goto out;
 
-	pci_dma_sync_single_for_device(tp->pci_dev, addr, pkt_size,
-				       PCI_DMA_FROMDEVICE);
+	pci_dma_sync_single_for_cpu(tp->pci_dev, addr, tp->rx_buf_sz,
+				PCI_DMA_FROMDEVICE);
 	skb_reserve(skb, 2);
 	skb_copy_to_linear_data(skb, sk_buff[0]->data, pkt_size);
 	*sk_buff = skb;