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ramips_eth: simplify tx_next computation

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19444 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
juhosg 2010-01-31 12:48:48 +00:00
parent 85ef0c49c7
commit 2e8d8d35d9
1 changed files with 2 additions and 5 deletions
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7
target/linux/ramips/files/drivers/net/ramips.c
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@ -163,10 +163,7 @@ ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
spin_lock_irqsave(&priv->page_lock, flags);
tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
if (tx == NUM_TX_DESC - 1)
tx_next = 0;
else
tx_next = tx + 1;
tx_next = (tx + 1) % NUM_TX_DESC;
if ((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
!(priv->tx[tx].txd2 & TX_DMA_DONE) ||
@ -180,7 +177,7 @@ ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
dev->stats.tx_bytes += skb->len;
priv->tx_skb[tx] = skb;
wmb();
ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
spin_unlock_irqrestore(&priv->page_lock, flags);
return NETDEV_TX_OK;