loopback: Drop obsolete ip_summed setting

Now that the network stack can handle inbound packets with partial
checksums, we should no longer clobber the ip_summed field in the
loopback driver.  This is because CHECKSUM_UNNECESSARY implies that
the checksum field is actually valid which is not true for loopback
packets since it's only partial (and thus complemented).

This allows packets from lo to then be SNATed to an external source
while still preserving the checksum's validity.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 489d53be2f5dd21b877602baa5a54955b3457e04..3b43bfd85a0f6dd3e1506d8a5a29e4ae85f3429e 100644 (file)
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -75,9 +75,6 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
        skb_orphan(skb);
 
        skb->protocol = eth_type_trans(skb,dev);
-#ifndef LOOPBACK_MUST_CHECKSUM
-       skb->ip_summed = CHECKSUM_UNNECESSARY;
-#endif
 
 #ifdef LOOPBACK_TSO
        if (skb_is_gso(skb)) {