linux-kernel - Re: [PATCH v3] cpuidle: big.LITTLE: add of_node

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Message-ID: <CAEExFWta3+EfvGODb58R8_3-=iMwJet0iGPY9zu8LmWFEMV2Fg@mail.gmail.com>
Date:   Tue, 11 Dec 2018 00:27:49 +0800
From:   Frank Lee <tiny.windzz@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     rjw@...ysocki.net, lorenzo.pieralisi@....com,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] cpuidle: big.LITTLE: add of_node_put()

On Mon, Dec 10, 2018 at 7:59 PM Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:
>
>
> Hi Yangtao,
>
>
> On 20/11/2018 17:14, Yangtao Li wrote:
> > of_find_node_by_path() acquires a reference to the node
> > returned by it and that reference needs to be dropped by its caller.
> > bl_idle_init() doesn't do that, so fix it.
> >
> > Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> > ---
> > Changes in v3:
> > -update changelog
> > ---
> >  drivers/cpuidle/cpuidle-big_little.c | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/cpuidle/cpuidle-big_little.c b/drivers/cpuidle/cpuidle-big_little.c
> > index db2ede565f1a..650f063ef809 100644
> > --- a/drivers/cpuidle/cpuidle-big_little.c
> > +++ b/drivers/cpuidle/cpuidle-big_little.c
> > @@ -174,8 +174,12 @@ static int __init bl_idle_init(void)
> >       /*
> >        * Initialize the driver just for a compliant set of machines
> >        */
> > -     if (!of_match_node(compatible_machine_match, root))
> > +     if (!of_match_node(compatible_machine_match, root)){
> > +             of_node_put(root);
> >               return -ENODEV;
> > +     }
> > +
> > +     of_node_put(root);
>
> Don't duplicate the of_node_put.
>
> I suggest:
>
> const struct of_device_id *match_id;
>
> [ ... ]
>
>
> match_id = of_match_node(compatible_machine_match, root);
>
> of_node_put(root);
>
> if (!match_id)
>         return -ENODEV;
>
>
Thank you for your suggestion, the new one has been sent.

Yours,
Yangtao
> >       if (!mcpm_is_available())
> >               return -EUNATCH;
> >
>
>
> --
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