Re: [PATCH 12/15] libata: make qc->nbytes include extra buffers

[Jeff Garzik <jeff@garzik.org>]

Tejun Heo wrote:
> qc->nbytes didn't use to include extra buffers setup by libata core
> layer and my be odd.  This patch makes qc->nbytes include any extra
> buffers setup by libata core layer and guaranteed to be aligned on 4
> byte boundary.
> 
> This value is to be used to program the host controller.  As this
> represents the actual length of buffer available to the controller and
> the controller must be able to deal with short transfers for ATAPI
> commands which can transfer variable length, this shouldn't break any
> controllers while making problems like rounding-down and controllers
> choking up on odd transfer bytes much less likely.
> 
> The unmodified value is stored in new field qc->raw_nbytes.
> 
> Signed-off-by: Tejun Heo <htejun@gmail.com>
> ---
>  drivers/ata/libata-core.c |   14 ++++++++++----
>  include/linux/libata.h    |    3 ++-
>  2 files changed, 12 insertions(+), 5 deletions(-)

applied 9-12 to #upstream