net: moxa: synchronize DMA memory

DMA memory should be synchronized before data is passed
to/from controller.

Add dma_sync_single_for_cpu(.., DMA_FROM_DEVICE) to RX path
and dma_sync_single_for_device(.., DMA_TO_DEVICE) to TX path.

Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/ethernet/moxa/moxart_ether.c b/drivers/net/ethernet/moxa/moxart_ether.c
index d66058d5c429..983d01949795 100644
--- a/drivers/net/ethernet/moxa/moxart_ether.c
+++ b/drivers/net/ethernet/moxa/moxart_ether.c
@@ -226,6 +226,9 @@ static int moxart_rx_poll(struct napi_struct *napi, int budget)
                 if (len > RX_BUF_SIZE)
                         len = RX_BUF_SIZE;
 
+                dma_sync_single_for_cpu(&ndev->dev,
+                                        priv->rx_mapping[rx_head],
+                                        priv->rx_buf_size, DMA_FROM_DEVICE);
                 skb = netdev_alloc_skb_ip_align(ndev, len);
 
                 if (unlikely(!skb)) {
@@ -348,6 +351,9 @@ static int moxart_mac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
                 len = ETH_ZLEN;
         }
 
+        dma_sync_single_for_device(&ndev->dev, priv->tx_mapping[tx_head],
+                                   priv->tx_buf_size, DMA_TO_DEVICE);
+
         txdes1 = TX_DESC1_LTS | TX_DESC1_FTS | (len & TX_DESC1_BUF_SIZE_MASK);
         if (tx_head == TX_DESC_NUM_MASK)
                 txdes1 |= TX_DESC1_END;