linux-kernel - Re: [PATCH] thermal: of: Fix logic in thermal_of_should

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Message-ID: <CAKchOA0gnq8i7UFApTfaUQx=DJWAF3NkQAc10aZhW0+zctw3Vg@mail.gmail.com>
Date: Sat, 22 Feb 2025 07:24:57 +0800
From: Yu-Che Cheng <giver@...omium.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Yu-Che Cheng <giver@...omium.org>, Daniel Lezcano <daniel.lezcano@...aro.org>, 
	Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>, 
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Chen-Yu Tsai <wenst@...omium.org>
Subject: Re: [PATCH] thermal: of: Fix logic in thermal_of_should_bind

Yes, it works on my side, as they look functionally equivalent.
Moving into a new function makes the control flow look more intuitive indeed.





On Fri, Feb 21, 2025 at 4:22 AM Rafael J. Wysocki <rafael@...nel.org> wrote:
>
> On Wed, Feb 19, 2025 at 10:40 PM Rafael J. Wysocki <rafael@...nel.org> wrote:
> >
> > On Wed, Feb 19, 2025 at 8:06 AM Yu-Che Cheng <giver@...omium.org> wrote:
> > >
> > > The current thermal_of_should_bind will stop iterating cooling-maps on
> > > the first matched trip point, leading to subsequent cooling devices
> > > binding to the same trip point failing to find the cooling spec.
> > >
> > > The iteration should continue enumerating subsequent cooling-maps if the
> > > target cooling device is not found.
> > >
> > > Fix the logic to break only when a matched cooling device is found.
> >
> > OK, but ->
> >
> > > Fixes: 94c6110b0b13 ("thermal/of: Use the .should_bind() thermal zone callback")
> > > Signed-off-by: Yu-Che Cheng <giver@...omium.org>
> > > ---
> > >  drivers/thermal/thermal_of.c | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
> > > index 5ab4ce4daaeb..69c530e38574 100644
> > > --- a/drivers/thermal/thermal_of.c
> > > +++ b/drivers/thermal/thermal_of.c
> > > @@ -312,7 +312,8 @@ static bool thermal_of_should_bind(struct thermal_zone_device *tz,
> > >                                 break;
> >
> > -> I'd prefer to do a jump from here, that is
> >
> > -                                 break;
> > +                                goto put_cm_np;
> > >                 }
> > >
> > > -               break;
> >
> > and remove the break statement above altogether.
> >
> > > +               if (result)
> > > +                       break;
> > >         }
> > >
> >
> > And of course the label needs to be added too:
> >
> > +put_cm_np:
> > >         of_node_put(cm_np);
> > >
> > > ---
>
> Or even, to avoid adding a new label, move the loop from
> thermal_of_should_bind() into a new function that will be called by it
> do carry out the cooling-maps lookup, like in the attached patch.
>
> Can you check if it works for you, please?