net: add skb frag size accessors

To ease skb->truesize sanitization, its better to be able to localize
all references to skb frags size.

Define accessors : skb_frag_size() to fetch frag size, and
skb_frag_size_{set|add|sub}() to manipulate it.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/ethernet/natsemi/ns83820.c b/drivers/net/ethernet/natsemi/ns83820.c
index 73616b911327..2b8f64ddfb55 100644
--- a/drivers/net/ethernet/natsemi/ns83820.c
+++ b/drivers/net/ethernet/natsemi/ns83820.c
@@ -1161,11 +1161,11 @@ again:
                         break;
 
                 buf = skb_frag_dma_map(&dev->pci_dev->dev, frag, 0,
-                                       frag->size, DMA_TO_DEVICE);
+                                       skb_frag_size(frag), DMA_TO_DEVICE);
                 dprintk("frag: buf=%08Lx  page=%08lx offset=%08lx\n",
                         (long long)buf, (long) page_to_pfn(frag->page),
                         frag->page_offset);
-                len = frag->size;
+                len = skb_frag_size(frag);
                 frag++;
                 nr_frags--;
         }