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Currently pskb_trim_rcsum() just balks on CHECKSUM_COMPLETE packets and remarks them as CHECKSUM_NONE, forcing a software checksum validation later. We have all of the mechanics available to fixup the skb->csum value, even for complicated fragmented packets, via the helpers skb_checksum() and csum_sub(). So just use them. Based upon a suggestion by Herbert Xu. Signed-off-by: David S. Miller <davem@davemloft.net>