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authorFlorian Fainelli <florian@openwrt.org>2012-07-15 14:09:24 +0000
committerFlorian Fainelli <florian@openwrt.org>2012-07-15 14:09:24 +0000
commit0e0b396663e26e14dab3c4709742af076c16035c (patch)
tree06cc36e6e503b22d07c0347e4faa02f68e567f8e /target/linux/mcs814x
parent0f0e42f28e785d2521f7003b981ab573c45f0a6c (diff)
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make sure we properly unmap DMA mappings we created
SVN-Revision: 32728
Diffstat (limited to 'target/linux/mcs814x')
-rw-r--r--target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c b/target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c
index 8254026d22..c148bea94a 100644
--- a/target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c
+++ b/target/linux/mcs814x/files-3.3/drivers/net/ethernet/mcs8140/nuport_mac.c
@@ -145,6 +145,7 @@ struct nuport_mac_priv {
/* Transmit buffers */
struct sk_buff *tx_skb[TX_RING_SIZE];
+ dma_addr_t tx_addr;
unsigned int valid_txskb[TX_RING_SIZE];
unsigned int cur_tx;
unsigned int dma_tx;
@@ -152,6 +153,7 @@ struct nuport_mac_priv {
/* Receive buffers */
struct sk_buff *rx_skb[RX_RING_SIZE];
+ dma_addr_t rx_addr;
unsigned int irq_rxskb[RX_RING_SIZE];
int pkt_len[RX_RING_SIZE];
unsigned int cur_rx;
@@ -237,7 +239,6 @@ static int nuport_mac_mii_reset(struct mii_bus *bus)
static int nuport_mac_start_tx_dma(struct nuport_mac_priv *priv,
struct sk_buff *skb)
{
- dma_addr_t p;
u32 reg;
unsigned int timeout = 2048;
@@ -253,12 +254,12 @@ static int nuport_mac_start_tx_dma(struct nuport_mac_priv *priv,
if (!timeout)
return -EBUSY;
- p = dma_map_single(&priv->pdev->dev, skb->data,
+ priv->tx_addr = dma_map_single(&priv->pdev->dev, skb->data,
skb->len, DMA_TO_DEVICE);
/* enable enhanced mode */
nuport_mac_writel(TX_DMA_ENH_ENABLE, TX_DMA_ENH);
- nuport_mac_writel(p, TX_BUFFER_ADDR);
+ nuport_mac_writel(priv->tx_addr, TX_BUFFER_ADDR);
nuport_mac_writel((skb->len) - 1, TX_PKT_BYTES);
wmb();
reg = TX_DMA_ENABLE | TX_DMA_START_FRAME | TX_DMA_END_FRAME;
@@ -279,7 +280,6 @@ static void nuport_mac_reset_tx_dma(struct nuport_mac_priv *priv)
static int nuport_mac_start_rx_dma(struct nuport_mac_priv *priv,
struct sk_buff *skb)
{
- dma_addr_t p;
u32 reg;
unsigned int timeout = 2048;
@@ -295,10 +295,10 @@ static int nuport_mac_start_rx_dma(struct nuport_mac_priv *priv,
if (!timeout)
return -EBUSY;
- p = dma_map_single(&priv->pdev->dev, skb->data,
+ priv->rx_addr = dma_map_single(&priv->pdev->dev, skb->data,
RX_ALLOC_SIZE, DMA_FROM_DEVICE);
- nuport_mac_writel(p, RX_BUFFER_ADDR);
+ nuport_mac_writel(priv->rx_addr, RX_BUFFER_ADDR);
wmb();
nuport_mac_writel(RX_DMA_ENABLE, RX_START_DMA);
@@ -461,6 +461,8 @@ static irqreturn_t nuport_mac_tx_interrupt(int irq, void *dev_id)
skb = priv->tx_skb[priv->dma_tx];
priv->tx_skb[priv->dma_tx] = NULL;
priv->valid_txskb[priv->dma_tx] = 0;
+ dma_unmap_single(&priv->pdev->dev, priv->rx_addr, skb->len,
+ DMA_TO_DEVICE);
dev_kfree_skb_irq(skb);
priv->dma_tx++;
@@ -554,6 +556,9 @@ static int nuport_mac_rx(struct net_device *dev, int limit)
status = get_unaligned((u32 *) (skb->data + len));
skb->dev = dev;
+ dma_unmap_single(&priv->pdev->dev, priv->rx_addr, skb->len,
+ DMA_FROM_DEVICE);
+
/* packet filter failed */
if (!(status & (1 << 30))) {
dev_kfree_skb_irq(skb);