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cxgb3: Correct comparisons and calculations using skb->tail and skb-transport_header 

This corrects an regression introduced by "net: Use 16bits for *_headers
fields of struct skbuff" when NET_SKBUFF_DATA_USES_OFFSET is not set. In
that case skb->tail will be a pointer whereas skb->transport_header
will be an offset from head. This is corrected by using wrappers that
ensure that comparisons and calculations are always made using pointers.

Cc: Simon Horman <horms@verge.net.au>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Li RongQing 2013-06-03 22:11:16 +00:00 committed by David S. Miller
parent 00f97da17a
commit 15dd16c233
2 changed files with 2 additions and 2 deletions
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2
drivers/net/ethernet/chelsio/cxgb3/sge.c
View File

@ -1583,7 +1583,7 @@ static void deferred_unmap_destructor(struct sk_buff *skb)
dui = (struct deferred_unmap_info *)skb->head;
p = dui->addr;
if (skb->tail - skb->transport_header)
if (skb_tail_pointer(skb) - skb_transport_header(skb))
pci_unmap_single(dui->pdev, *p++, skb_tail_pointer(skb) -
skb_transport_header(skb), PCI_DMA_TODEVICE);

2
drivers/net/ethernet/chelsio/cxgb4/sge.c
View File

@ -1294,7 +1294,7 @@ static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
flits = skb_transport_offset(skb) / 8U; /* headers */
cnt = skb_shinfo(skb)->nr_frags;
if (skb->tail != skb->transport_header)
if (skb_tail_pointer(skb) != skb_transport_header(skb))
cnt++;
return flits + sgl_len(cnt);
}