Re: [PATCH] platform/x86/intel-uncore-freq: Return error on write frequency

[srinivas pandruvada <srinivas.pandruvada@linux.intel.com>]

On Wed, 2023-04-19 at 16:35 +0300, Ilpo Järvinen wrote:
> On Tue, 18 Apr 2023, Srinivas Pandruvada wrote:
> 
> > Currently when the uncore_write() returns error, it is silently
> > ignored. Return error to user space when uncore_write() fails.
> > 
> > Signed-off-by: Srinivas Pandruvada
> > <srinivas.pandruvada@linux.intel.com>
> > Reviewed-by: Zhang Rui <rui.zhang@intel.com>
> > Tested-by: Wendy Wang <wendy.wang@intel.com>
> > ---
> > This patch has no dependency on TPMI patches for uncore support.
> > 
> >  .../x86/intel/uncore-frequency/uncore-frequency-common.c    | 6
> > +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-
> > frequency-common.c b/drivers/platform/x86/intel/uncore-
> > frequency/uncore-frequency-common.c
> > index cb24de9e97dc..fa8f14c925ec 100644
> > --- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-
> > common.c
> > +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-
> > common.c
> > @@ -44,14 +44,18 @@ static ssize_t store_min_max_freq_khz(struct
> > uncore_data *data,
> >                                       int min_max)
> >  {
> >         unsigned int input;
> > +       int ret;
> >  
> >         if (kstrtouint(buf, 10, &input))
> >                 return -EINVAL;
> >  
> >         mutex_lock(&uncore_lock);
> > -       uncore_write(data, input, min_max);
> > +       ret = uncore_write(data, input, min_max);
> >         mutex_unlock(&uncore_lock);
> >  
> > +       if (ret)
> > +               return ret;
> > +
> >         return count;
> >  }
> 
> Shouldn't this have Fixes tag?
With the reorg of the directories, the blame commit is not what which
will be shown by "git blame". The original one is:

Fixes: 49a474c7ba51 ("platform/x86: Add support for Uncore frequency
control")

Didn't mark to stable that the current MSR write can't fail on
production systems.

> 
> Other than that,
> 
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
> 
> 
Thanks,
Srinivas