From 15dd16c233b6d5ceea3a00f18d7c42902d0ac6b6 Mon Sep 17 00:00:00 2001 From: Li RongQing Date: Mon, 3 Jun 2013 22:11:16 +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. Cc: Simon Horman Signed-off-by: Li RongQing Reviewed-by: Simon Horman Signed-off-by: David S. Miller --- drivers/net/ethernet/chelsio/cxgb3/sge.c | 2 +- drivers/net/ethernet/chelsio/cxgb4/sge.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/chelsio/cxgb3/sge.c b/drivers/net/ethernet/chelsio/cxgb3/sge.c index 46d1efc17527..687ec4a8bb48 100644 --- a/drivers/net/ethernet/chelsio/cxgb3/sge.c +++ b/drivers/net/ethernet/chelsio/cxgb3/sge.c @@ -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); diff --git a/drivers/net/ethernet/chelsio/cxgb4/sge.c b/drivers/net/ethernet/chelsio/cxgb4/sge.c index 2bfbb206b35a..ac311f5f3eb9 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/sge.c +++ b/drivers/net/ethernet/chelsio/cxgb4/sge.c @@ -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); } -- 2.20.1