From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Mon, 29 Jun 2009 12:03:30 +0800

tcp: Stop non-TSO packets morphing into TSO

If a socket starts out on a non-TSO route, and then switches to
a TSO route, then the tail on the tx queue can morph into a TSO
packet, causing mischief because the rest of the stack does not
expect a partially linear TSO packet.

This patch fixes this by ensuring that skb->ip_summed is set to
CHECKSUM_PARTIAL before declaring a packet as TSO.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Applied.