linux-kernel - Re: [PATCH] clocksource: ingenic-ost: define pm functions properly in platform

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Date:   Tue, 22 Nov 2022 16:13:12 +0100
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Maarten ter Huurne <maarten@...ewalker.org>,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clocksource: ingenic-ost: define pm functions properly in
 platform_driver struct

On Tue, Nov 22, 2022 at 3:24 PM Paul Cercueil <paul@...pouillou.net> wrote:
>
> Hi Lukas,
>
> Le mar. 22 nov. 2022 à 15:14:34 +0100, Lukas Bulwahn
> <lukas.bulwahn@...il.com> a écrit :
> > Commit ca7b72b5a5f2 ("clocksource: Add driver for the Ingenic JZ47xx
> > OST")
> > adds the struct platform_driver ingenic_ost_driver, with the
> > definition of
> > pm functions under the non-existing config PM_SUSPEND, which means the
> > intended pm functions were never actually included in any build.
> >
> > Since commit 7a82e97a11b9 ("PM: core: introduce pm_ptr() macro"), the
> > default pattern for platform_driver definitions is to use pm_ptr().
> > Assuming CONFIG_PM_SUSPEND really intended to mean CONFIG_PM (and not
> > CONFIG_PM_SLEEP), use pm_ptr() just as most other drivers do.
>
> It actually was supposed to be CONFIG_PM_SLEEP, yes. You can see that
> because the only callbacks are .suspend_noirq and .resume_noirq.
> Therefore you can use pm_sleep_ptr() instead of pm_ptr().
>
> By the way, once you use this macro then the __maybe_unused tags on the
> dev_pm_ops structure and its callbacks are not needed anymore, so you
> can remove these as well.
>
> > Fixes: ca7b72b5a5f2 ("clocksource: Add driver for the Ingenic JZ47xx
> > OST")
>
> That Fixes: tag won't work since the pm_ptr() macro did not exist back
> then (besides, you didn't Cc linux-stable).
>
> I'd advocate to remove the Fixes: tag, since it is not really a bug
> fix, more like an improvement.
>

Thanks for the quick feedback. I will send a patch v2 incorporating that.

Lukas

> Cheers,
> -Paul
>
> > Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
> > ---
> >  drivers/clocksource/ingenic-ost.c | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> >
> > diff --git a/drivers/clocksource/ingenic-ost.c
> > b/drivers/clocksource/ingenic-ost.c
> > index 06d25754e606..6b64731df15c 100644
> > --- a/drivers/clocksource/ingenic-ost.c
> > +++ b/drivers/clocksource/ingenic-ost.c
> > @@ -181,9 +181,7 @@ static const struct of_device_id
> > ingenic_ost_of_match[] = {
> >  static struct platform_driver ingenic_ost_driver = {
> >       .driver = {
> >               .name = "ingenic-ost",
> > -#ifdef CONFIG_PM_SUSPEND
> > -             .pm = &ingenic_ost_pm_ops,
> > -#endif
> > +             .pm = pm_ptr(&ingenic_ost_pm_ops),
> >               .of_match_table = ingenic_ost_of_match,
> >       },
> >  };
> > --
> > 2.17.1
> >
>
>