Re: [PATCH] Avoid wiping out pr->performance during preregistering

[Stanislaw Gruszka <sgruszka@redhat.com>]

On Fri, 27 Mar 2009 21:15:23 -0400 (EDT)
Len Brown <lenb@kernel.org> wrote:

> > When cpufreq driver call acpi_processor_preregister_performance() , function
> > will clean up pr->performance even if there is possibly already registered
> > other cpufreq driver. The patch fix this potential problem. It also remove 
> > double checks in P domain basic validity code and move these checks to function
> > where _PSD data is captured.
> > 
> > Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
> > ---
> >  drivers/acpi/processor_perflib.c |   46 +++++++++++++++++--------------------
> >  1 files changed, 21 insertions(+), 25 deletions(-)
> > 
> 
> What failure symptom does the user see before this patch is applied?
> Does it merit backporting to .stable?

Nothing destructive, kernel ignore P-states limit requested by BIOS using
ACPI _PPC . I think this patch is not so good candidate for backporting.

Cheers
Stanislaw Gruszka