X-Git-Url: http://git.rohieb.name/openwrt.git/blobdiff_plain/7a797f4b8f9d90f2d8b8c8a51153bfb2fc61699a..fae14fc50e488238410d22d0849885fd871b3737:/target/linux/ramips/files/drivers/net/ramips.c

diff --git a/target/linux/ramips/files/drivers/net/ramips.c b/target/linux/ramips/files/drivers/net/ramips.c
index 622cd6020..35c44cc52 100644
--- a/target/linux/ramips/files/drivers/net/ramips.c
+++ b/target/linux/ramips/files/drivers/net/ramips.c
@@ -50,10 +50,32 @@ ramips_fe_rr(unsigned reg)
 	return __raw_readl(ramips_fe_base + reg);
 }
 
+static void
+ramips_cleanup_dma(struct net_device *dev)
+{
+	struct raeth_priv *priv = netdev_priv(dev);
+	int i;
+
+	for (i = 0; i < NUM_RX_DESC; i++)
+		if (priv->rx_skb[i])
+			dev_kfree_skb_any(priv->rx_skb[i]);
+
+	if (priv->rx)
+		dma_free_coherent(NULL,
+				  NUM_RX_DESC * sizeof(struct ramips_rx_dma),
+				  priv->rx, priv->phy_rx);
+
+	if (priv->tx)
+		dma_free_coherent(NULL,
+				  NUM_TX_DESC * sizeof(struct ramips_tx_dma),
+				  priv->tx, priv->phy_tx);
+}
+
 static int
 ramips_alloc_dma(struct net_device *dev)
 {
 	struct raeth_priv *priv = netdev_priv(dev);
+	int err = -ENOMEM;
 	int i;
 
 	priv->skb_free_idx = 0;
@@ -61,6 +83,9 @@ ramips_alloc_dma(struct net_device *dev)
 	/* setup tx ring */
 	priv->tx = dma_alloc_coherent(NULL,
 		NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx, GFP_ATOMIC);
+	if (!priv->tx)
+		goto err_cleanup;
+
 	for(i = 0; i < NUM_TX_DESC; i++)
 	{
 		memset(&priv->tx[i], 0, sizeof(struct ramips_tx_dma));
@@ -68,19 +93,21 @@ ramips_alloc_dma(struct net_device *dev)
 		priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
 		priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
 	}
-	ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
-	ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
-	ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
-	ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
 
 	/* setup rx ring */
 	priv->rx = dma_alloc_coherent(NULL,
 		NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx, GFP_ATOMIC);
+	if (!priv->rx)
+		goto err_cleanup;
+
 	memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
 	for(i = 0; i < NUM_RX_DESC; i++)
 	{
 		struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
-		BUG_ON(!new_skb);
+
+		if (!new_skb)
+			goto err_cleanup;
+
 		skb_reserve(new_skb, 2);
 		priv->rx[i].rxd1 =
 			dma_map_single(NULL, skb_put(new_skb, 2), MAX_RX_LENGTH + 2,
@@ -88,12 +115,28 @@ ramips_alloc_dma(struct net_device *dev)
 		priv->rx[i].rxd2 |= RX_DMA_LSO;
 		priv->rx_skb[i] = new_skb;
 	}
+
+	return 0;
+
+ err_cleanup:
+	ramips_cleanup_dma(dev);
+	return err;
+}
+
+static void
+ramips_setup_dma(struct net_device *dev)
+{
+	struct raeth_priv *priv = netdev_priv(dev);
+
+	ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
+	ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
+	ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
+	ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
+
 	ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
 	ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
 	ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
 	ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
-
-	return 0;
 }
 
 static int
@@ -257,8 +300,13 @@ static int
 ramips_eth_open(struct net_device *dev)
 {
 	struct raeth_priv *priv = netdev_priv(dev);
+	int err;
+
+	err = ramips_alloc_dma(dev);
+	if (err)
+		return err;
 
-	ramips_alloc_dma(dev);
+	ramips_setup_dma(dev);
 	ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
 		(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
 		RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
@@ -297,10 +345,7 @@ ramips_eth_stop(struct net_device *dev)
 	netif_stop_queue(dev);
 	tasklet_kill(&priv->tx_housekeeping_tasklet);
 	tasklet_kill(&priv->rx_tasklet);
-	dma_free_coherent(NULL, NUM_TX_DESC * sizeof(struct ramips_tx_dma),
-		priv->tx, priv->phy_tx);
-	dma_free_coherent(NULL, NUM_RX_DESC * sizeof(struct ramips_rx_dma),
-		priv->rx, priv->phy_rx);
+	ramips_cleanup_dma(dev);
 	printk(KERN_DEBUG "ramips_eth: stopped\n");
 	return 0;
 }