Re: [PATCH #upstream] libata: implement libata.force module parameter

[Jeff Garzik <jeff@garzik.org>]

Tejun Heo wrote:
> This patch implements libata.force module parameter which can
> selectively override ATA port, link and device configurations
> including cable type, SATA PHY SPD limit, transfer mode and NCQ.
> 
> For example, you can say "use 1.5Gbps for all fan-out ports attached
> to the second port but allow 3.0Gbps for the PMP device itself, oh,
> the device attached to the third fan-out port chokes on NCQ and
> shouldn't go over UDMA4" by the following.
> 
>  libata.force=2:1.5g,2.15:3.0g,2.03:noncq,udma4
> 
> Signed-off-by: Tejun Heo <htejun@gmail.com>
> ---
> Okay, the build failure is dependent on compiler version.  4.1.2 fails
> but 4.2.1 is okay.  I was using 4.2.1 so I didn't know about it.
> const is dropped from the offending structure and comment is added.
> 
>  Documentation/kernel-parameters.txt |   35 +++
>  drivers/ata/libata-core.c           |  380 +++++++++++++++++++++++++++++++++++-
>  drivers/ata/libata-eh.c             |    8 
>  drivers/ata/libata.h                |    1 
>  4 files changed, 420 insertions(+), 4 deletions(-)

applied