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| author | David S. Miller <davem@davemloft.net> | 2005-06-28 15:25:31 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2005-06-28 15:25:31 -0700 |
| commit | 689be43945e9ca7dd704522e55af1b8a73a994d3 (patch) | |
| tree | 6dcc7a5675a9a2b98c36ee54f2ba4386f84efe83 /drivers/net/fealnx.c | |
| parent | f835e471b557c45d2e5701ea5215f6e739b4eb39 (diff) | |
| download | lwn-689be43945e9ca7dd704522e55af1b8a73a994d3.tar.gz lwn-689be43945e9ca7dd704522e55af1b8a73a994d3.zip | |
[NET]: Remove gratuitous use of skb->tail in network drivers.
Many drivers use skb->tail unnecessarily.
In these situations, the code roughly looks like:
dev = dev_alloc_skb(...);
[optional] skb_reserve(skb, ...);
... skb->tail ...
But even if the skb_reserve() happens, skb->data equals
skb->tail. So it doesn't make any sense to use anything
other than skb->data in these cases.
Another case was the s2io.c driver directly mucking with
the skb->data and skb->tail pointers. It really just wanted
to do an skb_reserve(), so that's what the code was changed
to do instead.
Another reason I'm making this change as it allows some SKB
cleanups I have planned simpler to merge. In those cleanups,
skb->head, skb->tail, and skb->end pointers are removed, and
replaced with skb->head_room and skb->tail_room integers.
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Jeff Garzik <jgarzik@pobox.com>
Diffstat (limited to 'drivers/net/fealnx.c')
| -rw-r--r-- | drivers/net/fealnx.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/fealnx.c b/drivers/net/fealnx.c index 9e0303f6d73c..55dbe9a3fd56 100644 --- a/drivers/net/fealnx.c +++ b/drivers/net/fealnx.c @@ -1107,7 +1107,7 @@ static void allocate_rx_buffers(struct net_device *dev) skb->dev = dev; /* Mark as being used by this device. */ np->lack_rxbuf->skbuff = skb; - np->lack_rxbuf->buffer = pci_map_single(np->pci_dev, skb->tail, + np->lack_rxbuf->buffer = pci_map_single(np->pci_dev, skb->data, np->rx_buf_sz, PCI_DMA_FROMDEVICE); np->lack_rxbuf->status = RXOWN; ++np->really_rx_count; @@ -1300,7 +1300,7 @@ static void init_ring(struct net_device *dev) ++np->really_rx_count; np->rx_ring[i].skbuff = skb; skb->dev = dev; /* Mark as being used by this device. */ - np->rx_ring[i].buffer = pci_map_single(np->pci_dev, skb->tail, + np->rx_ring[i].buffer = pci_map_single(np->pci_dev, skb->data, np->rx_buf_sz, PCI_DMA_FROMDEVICE); np->rx_ring[i].status = RXOWN; np->rx_ring[i].control |= RXIC; @@ -1737,11 +1737,11 @@ static int netdev_rx(struct net_device *dev) #if ! defined(__alpha__) eth_copy_and_sum(skb, - np->cur_rx->skbuff->tail, pkt_len, 0); + np->cur_rx->skbuff->data, pkt_len, 0); skb_put(skb, pkt_len); #else memcpy(skb_put(skb, pkt_len), - np->cur_rx->skbuff->tail, pkt_len); + np->cur_rx->skbuff->data, pkt_len); #endif pci_dma_sync_single_for_device(np->pci_dev, np->cur_rx->buffer, |