From 97bc477cbc3d63f2a29c2c81031434b3a082f44c Mon Sep 17 00:00:00 2001 From: Phil Sutter Date: Wed, 14 Jan 2009 21:50:41 -0800 Subject: [PATCH] korina: fix handling tx_chain_tail Originally this must have been a rewrite error when introducing 'chain_index'. But the original driver did not use the previous chain item everywhere: when altering the address tx_chain_tail points to, it should move forward, not backwards. Also this is not an "index" but rather the penultimate element in the chain, so rename it accordingly. Signed-off-by: Phil Sutter Acked-by: Florian Fainelli Signed-off-by: David S. Miller --- drivers/net/korina.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/net/korina.c b/drivers/net/korina.c index dced5e71463..f2001750251 100644 --- a/drivers/net/korina.c +++ b/drivers/net/korina.c @@ -199,7 +199,7 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev) struct korina_private *lp = netdev_priv(dev); unsigned long flags; u32 length; - u32 chain_index; + u32 chain_prev, chain_next; struct dma_desc *td; spin_lock_irqsave(&lp->lock, flags); @@ -231,8 +231,8 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev) /* Setup the transmit descriptor. */ dma_cache_inv((u32) td, sizeof(*td)); td->ca = CPHYSADDR(skb->data); - chain_index = (lp->tx_chain_tail - 1) & - KORINA_TDS_MASK; + chain_prev = (lp->tx_chain_tail - 1) & KORINA_TDS_MASK; + chain_next = (lp->tx_chain_tail + 1) & KORINA_TDS_MASK; if (readl(&(lp->tx_dma_regs->dmandptr)) == 0) { if (lp->tx_chain_status == desc_empty) { @@ -240,7 +240,7 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev) td->control = DMA_COUNT(length) | DMA_DESC_COF | DMA_DESC_IOF; /* Move tail */ - lp->tx_chain_tail = chain_index; + lp->tx_chain_tail = chain_next; /* Write to NDPTR */ writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]), &lp->tx_dma_regs->dmandptr); @@ -251,12 +251,12 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev) td->control = DMA_COUNT(length) | DMA_DESC_COF | DMA_DESC_IOF; /* Link to prev */ - lp->td_ring[chain_index].control &= + lp->td_ring[chain_prev].control &= ~DMA_DESC_COF; /* Link to prev */ - lp->td_ring[chain_index].link = CPHYSADDR(td); + lp->td_ring[chain_prev].link = CPHYSADDR(td); /* Move tail */ - lp->tx_chain_tail = chain_index; + lp->tx_chain_tail = chain_next; /* Write to NDPTR */ writel(CPHYSADDR(&lp->td_ring[lp->tx_chain_head]), &(lp->tx_dma_regs->dmandptr)); @@ -270,17 +270,17 @@ static int korina_send_packet(struct sk_buff *skb, struct net_device *dev) td->control = DMA_COUNT(length) | DMA_DESC_COF | DMA_DESC_IOF; /* Move tail */ - lp->tx_chain_tail = chain_index; + lp->tx_chain_tail = chain_next; lp->tx_chain_status = desc_filled; netif_stop_queue(dev); } else { /* Update tail */ td->control = DMA_COUNT(length) | DMA_DESC_COF | DMA_DESC_IOF; - lp->td_ring[chain_index].control &= + lp->td_ring[chain_prev].control &= ~DMA_DESC_COF; - lp->td_ring[chain_index].link = CPHYSADDR(td); - lp->tx_chain_tail = chain_index; + lp->td_ring[chain_prev].link = CPHYSADDR(td); + lp->tx_chain_tail = chain_next; } } dma_cache_wback((u32) td, sizeof(*td)); -- 2.41.1