linux-kernel - Re: [PATCH v2] counter/ftm-quaddec: Use device-managed registration API

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Date:   Fri, 26 Jul 2019 21:21:13 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     Patrick Havelange <patrick.havelange@...ensium.com>
Cc:     William Breathitt Gray <vilhelm.gray@...il.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] counter/ftm-quaddec: Use device-managed registration API

Patrick Havelange <patrick.havelange@...ensium.com> 于2019年7月26日周五 下午8:51写道：
>
> Hello,
>
> On Fri, Jul 26, 2019 at 4:28 AM Chuhong Yuan <hslester96@...il.com> wrote:
> >
> > Make use of devm_counter_register.
> > Then we can remove redundant unregistration API
> > usage to make code simpler.
> >
> > Signed-off-by: Chuhong Yuan <hslester96@...il.com>
> > ---
> > Changes in v2:
> >   - Use devm_add_action_or_reset to keep
> >     resource release order.
>
> This is better now indeed.
>
> However it seems there is an issue with the mail/patch format, I'm
> unable to apply it with git am, and if you look at
> https://lore.kernel.org/patchwork/patch/1105782/ the diff section is
> missing the beginning of the patch. I don't know why, but I think it
> should be looked into.
>
> Otherwise, it's fine by me.
>
> Regards,
>
> Patrick Havelange

I am also not clear about why this issue happened.
Maybe it is caused by changelog format.
I will revise changelog and resend it later.



>
>
> >   - _remove() function is redundant now,
> >     delete it.
> >
> >  drivers/counter/ftm-quaddec.c | 31 +++++++++++--------------------
> >  1 file changed, 11 insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/counter/ftm-quaddec.c b/drivers/counter/ftm-quaddec.c
> > index 68a9b7393457..76c70a6c3593 100644
> > --- a/drivers/counter/ftm-quaddec.c
> > +++ b/drivers/counter/ftm-quaddec.c
> > @@ -100,16 +100,17 @@ static void ftm_quaddec_init(struct ftm_quaddec *ftm)
> >         ftm_set_write_protection(ftm);
> >  }
> >
> > -static void ftm_quaddec_disable(struct ftm_quaddec *ftm)
> > +static void ftm_quaddec_disable(void *ftm)
> >  {
> > -       ftm_clear_write_protection(ftm);
> > -       ftm_write(ftm, FTM_MODE, 0);
> > -       ftm_write(ftm, FTM_QDCTRL, 0);
> > +       struct ftm_quaddec *ftm_qua = ftm;
> >
> > +       ftm_clear_write_protection(ftm_qua);
> > +       ftm_write(ftm_qua, FTM_MODE, 0);
> > +       ftm_write(ftm_qua, FTM_QDCTRL, 0);
> >         /*
> >          * This is enough to disable the counter. No clock has been
> >          * selected by writing to FTM_SC in init()
> >          */
> > -       ftm_set_write_protection(ftm);
> > +       ftm_set_write_protection(ftm_qua);
> >  }
> >
> >  static int ftm_quaddec_get_prescaler(struct counter_device *counter,
> > @@ -316,22 +317,13 @@ static int ftm_quaddec_probe(struct platform_device *pdev)
> >         mutex_init(&ftm->ftm_quaddec_mutex);
> >
> >         ftm_quaddec_init(ftm);
> > -
> > -       ret = counter_register(&ftm->counter);
> > +       ret = devm_add_action_or_reset(&pdev->dev, ftm_quaddec_disable, ftm);
> >         if (ret)
> > -               ftm_quaddec_disable(ftm);
> > -
> > -       return ret;
> > -}
> > -
> > -static int ftm_quaddec_remove(struct platform_device *pdev)
> > -{
> > -       struct ftm_quaddec *ftm = platform_get_drvdata(pdev);
> > -
> > -       counter_unregister(&ftm->counter);
> > -
> > -       ftm_quaddec_disable(ftm);
> > +               return ret;
> >
> > +       ret = devm_counter_register(&pdev->dev, &ftm->counter);
> > +       if (ret)
> > +               return ret;
> >         return 0;
> >  }
> >
> > @@ -346,7 +338,6 @@ static struct platform_driver ftm_quaddec_driver = {
> >                 .of_match_table = ftm_quaddec_match,
> >         },
> >         .probe = ftm_quaddec_probe,
> > -       .remove = ftm_quaddec_remove,
> >  };
> >
> >  module_platform_driver(ftm_quaddec_driver);
> > --
> > 2.20.1
> >