Depending on the processor model, write-combining may result in
reordering that the NIC will not tolerate. This typically results
in a DMA error event and reset by the driver, logged as:
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>