ethoc: fix buffer address mapping

The pointer address in buffer descriptors is physical address. The
pointer that processor used to access packet is virtual address.

Though the higher bits of pointer address used by the MAC may be
truncated to zero in special case, it is not always true in larger
designs.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/net/ethoc.c b/drivers/net/ethoc.c
index 747562037e23..f92747fc5f8b 100644
--- a/drivers/net/ethoc.c
+++ b/drivers/net/ethoc.c
@@ -284,7 +284,7 @@ static int ethoc_init_ring(struct ethoc *dev)
         dev->cur_rx = 0;
 
         /* setup transmission buffers */
-        bd.addr = 0;
+        bd.addr = virt_to_phys(dev->membase);
         bd.stat = TX_BD_IRQ | TX_BD_CRC;
 
         for (i = 0; i < dev->num_tx; i++) {
@@ -295,7 +295,6 @@ static int ethoc_init_ring(struct ethoc *dev)
                 bd.addr += ETHOC_BUFSIZ;
         }
 
-        bd.addr = dev->num_tx * ETHOC_BUFSIZ;
         bd.stat = RX_BD_EMPTY | RX_BD_IRQ;
 
         for (i = 0; i < dev->num_rx; i++) {
@@ -401,7 +400,7 @@ static int ethoc_rx(struct net_device *dev, int limit)
                         int size = bd.stat >> 16;
                         struct sk_buff *skb = netdev_alloc_skb(dev, size);
                         if (likely(skb)) {
-                                void *src = priv->membase + bd.addr;
+                                void *src = phys_to_virt(bd.addr);
                                 memcpy_fromio(skb_put(skb, size), src, size);
                                 skb->protocol = eth_type_trans(skb, dev);
                                 priv->stats.rx_packets++;
@@ -823,7 +822,7 @@ static netdev_tx_t ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev)
         else
                 bd.stat &= ~TX_BD_PAD;
 
-        dest = priv->membase + bd.addr;
+        dest = phys_to_virt(bd.addr);
         memcpy_toio(dest, skb->data, skb->len);
 
         bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK);