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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/3c59x.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/3c59x.c')
| -rw-r--r-- | drivers/net/3c59x.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c index 80ec9aa575bb..07746b95fd83 100644 --- a/drivers/net/3c59x.c +++ b/drivers/net/3c59x.c @@ -1802,7 +1802,7 @@ vortex_open(struct net_device *dev) break; /* Bad news! */ skb->dev = dev; /* Mark as being used by this device. */ skb_reserve(skb, 2); /* Align IP on 16 byte boundaries */ - vp->rx_ring[i].addr = cpu_to_le32(pci_map_single(VORTEX_PCI(vp), skb->tail, PKT_BUF_SZ, PCI_DMA_FROMDEVICE)); + vp->rx_ring[i].addr = cpu_to_le32(pci_map_single(VORTEX_PCI(vp), skb->data, PKT_BUF_SZ, PCI_DMA_FROMDEVICE)); } if (i != RX_RING_SIZE) { int j; @@ -2632,7 +2632,7 @@ boomerang_rx(struct net_device *dev) pci_dma_sync_single_for_cpu(VORTEX_PCI(vp), dma, PKT_BUF_SZ, PCI_DMA_FROMDEVICE); /* 'skb_put()' points to the start of sk_buff data area. */ memcpy(skb_put(skb, pkt_len), - vp->rx_skbuff[entry]->tail, + vp->rx_skbuff[entry]->data, pkt_len); pci_dma_sync_single_for_device(VORTEX_PCI(vp), dma, PKT_BUF_SZ, PCI_DMA_FROMDEVICE); vp->rx_copy++; @@ -2678,7 +2678,7 @@ boomerang_rx(struct net_device *dev) } skb->dev = dev; /* Mark as being used by this device. */ skb_reserve(skb, 2); /* Align IP on 16 byte boundaries */ - vp->rx_ring[entry].addr = cpu_to_le32(pci_map_single(VORTEX_PCI(vp), skb->tail, PKT_BUF_SZ, PCI_DMA_FROMDEVICE)); + vp->rx_ring[entry].addr = cpu_to_le32(pci_map_single(VORTEX_PCI(vp), skb->data, PKT_BUF_SZ, PCI_DMA_FROMDEVICE)); vp->rx_skbuff[entry] = skb; } vp->rx_ring[entry].status = 0; /* Clear complete bit. */ |