net: Use skb_checksum_start_offset()

Replace skb->csum_start - skb_headroom(skb) with skb_checksum_start_offset().

Note for usb/smsc95xx: skb->data - skb->head == skb_headroom(skb).

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index b6d402806ae6..90a23e410d1b 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -519,7 +519,7 @@ static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
 
         if (skb->ip_summed == CHECKSUM_PARTIAL) {
                 hdr->hdr.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
-                hdr->hdr.csum_start = skb->csum_start - skb_headroom(skb);
+                hdr->hdr.csum_start = skb_checksum_start_offset(skb);
                 hdr->hdr.csum_offset = skb->csum_offset;
         } else {
                 hdr->hdr.flags = 0;