linux-kernel - Re: [PATCH v2 1/3] thermal: gov_power_allocator: Allow binding without cooling devices

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Message-ID: <CAJZ5v0gU+a60EvKKnGsgS32YoaQE8RffwPSrbbV2APSFKgn+UA@mail.gmail.com>
Date: Wed, 3 Apr 2024 16:41:08 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Lukasz Luba <lukasz.luba@....com>, Nikita Travkin <nikitos.tr@...il.com>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, 
	linux-pm@...r.kernel.org, Daniel Lezcano <daniel.lezcano@...aro.org>, 
	linux-kernel@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH v2 1/3] thermal: gov_power_allocator: Allow binding
 without cooling devices

On Wed, Apr 3, 2024 at 2:44 PM Lukasz Luba <lukasz.luba@....com> wrote:
>
>
>
> On 4/3/24 12:31, Nikita Travkin via B4 Relay wrote:
> > From: Nikita Travkin <nikita@...n.ru>
> >
> > IPA was recently refactored to split out memory allocation into a
> > separate funciton. That funciton was made to return -EINVAL if there is
> > zero power_actors and thus no memory to allocate. This causes IPA to
> > fail probing when the thermal zone has no attached cooling devices.
> >
> > Since cooling devices can attach after the thermal zone is created and
> > the governer is attached to it, failing probe due to the lack of cooling
> > devices is incorrect.
> >
> > Change the allocate_actors_buffer() to return success when there is no
> > cooling devices present.
> >
> > Fixes: 912e97c67cc3 ("thermal: gov_power_allocator: Move memory allocation out of throttle()")
> > Signed-off-by: Nikita Travkin <nikita@...n.ru>
> > ---
> >   drivers/thermal/gov_power_allocator.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/thermal/gov_power_allocator.c b/drivers/thermal/gov_power_allocator.c
> > index 1b17dc4c219c..ec637071ef1f 100644
> > --- a/drivers/thermal/gov_power_allocator.c
> > +++ b/drivers/thermal/gov_power_allocator.c
> > @@ -606,7 +606,7 @@ static int allocate_actors_buffer(struct power_allocator_params *params,
> >
> >       /* There might be no cooling devices yet. */
> >       if (!num_actors) {
> > -             ret = -EINVAL;
> > +             ret = 0;
> >               goto clean_state;
> >       }
> >
> >
>
> LGTM
>
> Reviewed-by: Lukasz Luba <lukasz.luba@....com>

Applied as 6.9-rc material along with the [2/3], thanks!