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net: calxedaxgmac: fix xgmac_xmit DMA mapping error handling 

On a DMA mapping error in xgmac_xmit, we should simply free the skb and
return NETDEV_TX_OK rather than -EIO. In the case of errors in mapping
frags, we need to undo everything that has been setup.

Reported-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rob Herring 2013-08-30 16:49:29 -05:00 committed by David S. Miller
parent 531cda20cd
commit 92cd4253e5
1 changed files with 26 additions and 5 deletions
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31
drivers/net/ethernet/calxeda/xgmac.c
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@ -466,6 +466,13 @@ static inline void desc_set_tx_owner(struct xgmac_dma_desc *p, u32 flags)
p->flags = cpu_to_le32(tmpflags);
}
static inline void desc_clear_tx_owner(struct xgmac_dma_desc *p)
{
u32 tmpflags = le32_to_cpu(p->flags);
tmpflags &= TXDESC_END_RING;
p->flags = cpu_to_le32(tmpflags);
}
static inline int desc_get_tx_ls(struct xgmac_dma_desc *p)
{
return le32_to_cpu(p->flags) & TXDESC_LAST_SEG;
@ -1100,7 +1107,7 @@ static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
paddr = dma_map_single(priv->device, skb->data, len, DMA_TO_DEVICE);
if (dma_mapping_error(priv->device, paddr)) {
dev_kfree_skb(skb);
return -EIO;
return NETDEV_TX_OK;
}
priv->tx_skbuff[entry] = skb;
desc_set_buf_addr_and_size(desc, paddr, len);
@ -1112,10 +1119,8 @@ static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
paddr = skb_frag_dma_map(priv->device, frag, 0, len,
DMA_TO_DEVICE);
if (dma_mapping_error(priv->device, paddr)) {
dev_kfree_skb(skb);
return -EIO;
}
if (dma_mapping_error(priv->device, paddr))
goto dma_err;
entry = dma_ring_incr(entry, DMA_TX_RING_SZ);
desc = priv->dma_tx + entry;
@ -1151,6 +1156,22 @@ static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
netif_start_queue(dev);
}
return NETDEV_TX_OK;
dma_err:
entry = priv->tx_head;
for ( ; i > 0; i--) {
entry = dma_ring_incr(entry, DMA_TX_RING_SZ);
desc = priv->dma_tx + entry;
priv->tx_skbuff[entry] = NULL;
dma_unmap_page(priv->device, desc_get_buf_addr(desc),
desc_get_buf_len(desc), DMA_TO_DEVICE);
desc_clear_tx_owner(desc);
}
desc = first;
dma_unmap_single(priv->device, desc_get_buf_addr(desc),
desc_get_buf_len(desc), DMA_TO_DEVICE);
dev_kfree_skb(skb);
return NETDEV_TX_OK;
}
static int xgmac_rx(struct xgmac_priv *priv, int limit)