tree f95d7271223a6fb762b1786a4c15f9ecf95c7aed
parent 7071cf7fc435ab84df872613f613a9a055964fc1
author Herbert Xu <herbert@gondor.apana.org.au> 1414960213 +0800
committer David S. Miller <davem@davemloft.net> 1415042826 -0500

tun: Fix csum_start with VLAN acceleration

When VLAN acceleration is in use on the xmit path, we end up
setting csum_start to the wrong place.  The result is that the
whoever ends up doing the checksum setting will corrupt the packet
instead of writing the checksum to the expected location, usually
this means writing the checksum with an offset of -4.

This patch fixes this by adjusting csum_start when VLAN acceleration
is detected.

Fixes: 6680ec68eff4 ("tuntap: hardware vlan tx support")
Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>