linux-kernel - Re: [PATCH 2/2] PM / devfreq: exynos-bus: add missing exynos_bus_disable_edev in exynos_bus_profile

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Date:   Mon, 23 Dec 2019 01:47:33 +0800
From:   Frank Lee <tiny.windzz@...il.com>
To:     Chanwoo Choi <chanwoo@...nel.org>
Cc:     Chanwoo Choi <cw00.choi@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] PM / devfreq: exynos-bus: add missing
 exynos_bus_disable_edev in exynos_bus_profile_init

On Mon, Dec 23, 2019 at 1:02 AM Chanwoo Choi <chanwoo@...nel.org> wrote:
>
> Hi,
>
> Please use capital letter for the first char of patch title
> and better to edit the patch title as following:
> Actually, it is difficult to understand the role by only reading
> the function name. It depends on only this driver.
> So, better to edit it as following because devfreq-event
> is standard name in linux kernel. I think it is easy to understand
> what the patch does.
>
> - PM / devfreq: exynos-bus: Disable the devfreq-event device when failed
>
>
> 2019년 12월 22일 (일) 오전 3:21, Yangtao Li <tiny.windzz@...il.com>님이 작성:
> >
> > The exynos_bus_profile_init process may fail, but the devfreq event device
> > remains enabled. Call devfreq_event_disable_edev on the error return path.
> >
> > Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> > ---
> >  drivers/devfreq/exynos-bus.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
> > index 7f5917d59072..5e54eaf3cfc6 100644
> > --- a/drivers/devfreq/exynos-bus.c
> > +++ b/drivers/devfreq/exynos-bus.c
> > @@ -335,10 +335,14 @@ static int exynos_bus_profile_init(struct exynos_bus *bus,
> >         ret = exynos_bus_set_event(bus);
> >         if (ret < 0) {
> >                 dev_err(dev, "failed to set event to devfreq-event devices\n");
> > -               return ret;
> > +               goto err_disable_edev;
> >         }
> >
> >         return 0;
> > +
> > +err_disable_edev:
>
> err_edev is enough instead of 'err_disable_edev'
>
> > +       exynos_bus_disable_edev(bus);
>
> exynos_bus_disable_edev() has return value for detecting the error.
> Need to add following warning message.
>
> if (ret < 0)
>      dev_warn(dev, "failed to disable the devfreq-event devices\n");

I'm not sure if it should be like this,
it may rewrite the above error code.

Yangtao

>
>
> > +       return ret;
> >  }
> >
> >  static int exynos_bus_profile_init_passive(struct exynos_bus *bus,
> > --
> > 2.17.1
> >
>
>
> --
> Best Regards,
> Chanwoo Choi