The atl1 driver is causing stalled connections and file corruption
whenever TSO is enabled.  Two examples are here:

http://lkml.org/lkml/2008/7/15/325
http://lkml.org/lkml/2008/8/18/543

Disable TSO by default until we can determine the source of the
problem.
Signed-off-by: NJay Cliburn <jacliburn@bellsouth.net>
cc: stable@kernel.org
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>