{
return csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
skb->len - dataoff, IPPROTO_TCP,
- skb->ip_summed == CHECKSUM_HW ? skb->csum
+ skb->ip_summed == CHECKSUM_HW
+ ? csum_sub(skb->csum,
+ skb_checksum(skb, 0, dataoff, 0))
: skb_checksum(skb, dataoff, skb->len - dataoff,
0));
}