From be8b678c6c63010cd2b0f4f602bd3066f7827fb2 Mon Sep 17 00:00:00 2001 From: Simon Horman Date: Tue, 28 May 2013 20:34:24 +0000 Subject: [PATCH] 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. Signed-off-by: Simon Horman Signed-off-by: David S. Miller --- drivers/net/ethernet/chelsio/cxgb3/sge.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/chelsio/cxgb3/sge.c b/drivers/net/ethernet/chelsio/cxgb3/sge.c index 2fd773e267dc..46d1efc17527 100644 --- a/drivers/net/ethernet/chelsio/cxgb3/sge.c +++ b/drivers/net/ethernet/chelsio/cxgb3/sge.c @@ -1584,9 +1584,8 @@ static void deferred_unmap_destructor(struct sk_buff *skb) p = dui->addr; if (skb->tail - skb->transport_header) - pci_unmap_single(dui->pdev, *p++, - skb->tail - skb->transport_header, - PCI_DMA_TODEVICE); + pci_unmap_single(dui->pdev, *p++, skb_tail_pointer(skb) - + skb_transport_header(skb), PCI_DMA_TODEVICE); si = skb_shinfo(skb); for (i = 0; i < si->nr_frags; i++) @@ -1647,8 +1646,8 @@ static void write_ofld_wr(struct adapter *adap, struct sk_buff *skb, flits = skb_transport_offset(skb) / 8; sgp = ndesc == 1 ? (struct sg_ent *)&d->flit[flits] : sgl; sgl_flits = write_sgl(skb, sgp, skb_transport_header(skb), - skb->tail - skb->transport_header, - addr); + skb_tail_pointer(skb) - + skb_transport_header(skb), addr); if (need_skb_unmap()) { setup_deferred_unmapping(skb, adap->pdev, sgp, sgl_flits); skb->destructor = deferred_unmap_destructor; @@ -1674,7 +1673,7 @@ static inline unsigned int calc_tx_descs_ofld(const struct sk_buff *skb) flits = skb_transport_offset(skb) / 8; /* 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_to_desc(flits + sgl_len(cnt)); } -- 2.20.1