linux-kernel - Re: [PATCH RESEND 1/2] thermal: intel: Prevent accidental clearing of HFI status

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Date:   Fri, 18 Nov 2022 20:49:01 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>, daniel.lezcano@...aro.org,
        amitk@...nel.org, rui.zhang@...el.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Subject: Re: [PATCH RESEND 1/2] thermal: intel: Prevent accidental clearing of
 HFI status

On Fri, Nov 18, 2022 at 8:38 PM srinivas pandruvada
<srinivas.pandruvada@...ux.intel.com> wrote:
>
> On Fri, 2022-11-18 at 18:54 +0100, Rafael J. Wysocki wrote:
> > On Wed, Nov 16, 2022 at 3:54 AM Srinivas Pandruvada
> > <srinivas.pandruvada@...ux.intel.com> wrote:
> > >
> > > When there is a package thermal interrupt with PROCHOT log, it will
> > > be
> > > processed and cleared. It is possible that there is an active HFI
> > > event
> > > status, which is about to get processed or getting processed. While
> > > clearing PROCHOT log bit, it will also clear HFI status bit. This
> > > means
> > > that hardware is free to update HFI memory.
> > >
> > > When clearing a package thermal interrupt, some processors will
> > > generate
> > > a "general protection fault" when any of the read only bit is set
> > > to 1.
> > > The driver maintains a mask of all read-write bits which can be
> > > set.
> > > This mask doesn't include HFI status bit. This bit will also be
> > > cleared,
> > > as it will be assumed read-only bit. So, add HFI status bit 26 to
> > > the
> > > mask.
> > >
> > > Signed-off-by: Srinivas Pandruvada
> > > <srinivas.pandruvada@...ux.intel.com>
> > > Reviewed-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
> >
> > Is a Fixes tag missing here?
> While adding the following change, this should have been take care of:
> ab09b0744a99 ("thermal: intel: hfi: Enable notification interrupt")
>
> But the above change didn't add this line, which this patch is
> changing. We can add:
>
> Fixes: ab09b0744a99 ("thermal: intel: hfi: Enable notification
> interrupt")

OK

> Do you want me to send another PATCH with fixes.

No, I can take care of this.

> >
> > Also, do you want it in 6.1-rc7 or would 6.2 suffice?
> Not urgent. 6.2 should be fine.

OK, thanks!