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

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Message-ID: <CAKKE0ZG9hKqOnPHCfmW8Mpe2tdcdpdv4Njvx7XNuw6ykJf3P0w@mail.gmail.com>
Date:   Fri, 26 Jul 2019 14:51:30 +0200
From:   Patrick Havelange <patrick.havelange@...ensium.com>
To:     Chuhong Yuan <hslester96@...il.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

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


>   - _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
>