linux-kernel - Re: [PATCH] media: cros-ec-cec: disable the device wakeup on remove

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Date:   Tue, 7 Jul 2020 10:03:34 +0200
From:   Dariusz Marcinkiewicz <darekm@...gle.com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     linux-media@...r.kernel.org, hverkuil-cisco@...all.nl,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Dariusz Marcinkiewicz <darekm@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: cros-ec-cec: disable the device wakeup on remove

On Mon, Jul 6, 2020 at 11:00 AM Alexandre Belloni
<alexandre.belloni@...tlin.com> wrote:
>
> On 06/07/2020 10:52:38+0200, Dariusz Marcinkiewicz wrote:
> > The device is enabled for wake up while the driver is loaded.
> > For symmetry, disable wakeup when it is removed.
> >
>
> This is not necessary as it is handled by the core properly. There are
> currently 73 calls to device_init_wakeup that are not necessary, this
> would add one more.
>
Thank you.

To make sure - your comment applies even if the device node in
question is not actually removed, as it is the case here? This is a
platform dev, which won't be freed when the driver is unloaded.

Regards.



> > Signed-off-by: Dariusz Marcinkiewicz <darekm@...gle.com>
> > ---
> >  drivers/media/cec/platform/cros-ec/cros-ec-cec.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/media/cec/platform/cros-ec/cros-ec-cec.c b/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
> > index 2d95e16cd248..3881ed7bc3d9 100644
> > --- a/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
> > +++ b/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
> > @@ -277,8 +277,6 @@ static int cros_ec_cec_probe(struct platform_device *pdev)
> >       platform_set_drvdata(pdev, cros_ec_cec);
> >       cros_ec_cec->cros_ec = cros_ec;
> >
> > -     device_init_wakeup(&pdev->dev, 1);
> > -
> >       cros_ec_cec->adap = cec_allocate_adapter(&cros_ec_cec_ops, cros_ec_cec,
> >                                                DRV_NAME,
> >                                                CEC_CAP_DEFAULTS |
> > @@ -306,6 +304,8 @@ static int cros_ec_cec_probe(struct platform_device *pdev)
> >       if (ret < 0)
> >               goto out_probe_notify;
> >
> > +     device_init_wakeup(&pdev->dev, 1);
> > +
> >       return 0;
> >
> >  out_probe_notify:
> > @@ -335,6 +335,8 @@ static int cros_ec_cec_remove(struct platform_device *pdev)
> >                                        cros_ec_cec->adap);
> >       cec_unregister_adapter(cros_ec_cec->adap);
> >
> > +     device_init_wakeup(&pdev->dev, 0);
> > +
> >       return 0;
> >  }
> >
> > --
> > 2.27.0.212.ge8ba1cc988-goog
> >
>
> --
> Alexandre Belloni, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com