linux-kernel - Re: [PATCH] gpio: gpio-xgene: simplify probe, return devm_gpiochip_add

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Message-ID: <CAMpxmJW1Q-m_W+n28V9sEqvnb4ZVTGq_55DedhuJxu5icuD9sQ@mail.gmail.com>
Date:   Sun, 23 May 2021 20:31:10 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Alexandru Ardelean <aardelean@...iqon.com>
Cc:     linux-gpio <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] gpio: gpio-xgene: simplify probe, return
 devm_gpiochip_add_data() directly

On Fri, May 21, 2021 at 8:10 PM Alexandru Ardelean
<aardelean@...iqon.com> wrote:
>
> The handling of the return value from devm_gpiochip_add_data() is a bit
> redundant. It prints messages on error and success cases.
> While the success message may be useful, it is more in the area of log
> spam, and these can be printed with other forms of kernel logging.
>
> This change does a direct return with devm_gpiochip_add_data() in the probe
> function.
>
> The platform_set_drvdata() is needed, as this driver uses the stored
> private date in the PM suspend/resume routines.
>
> Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>
> ---
>  drivers/gpio/gpio-xgene.c | 11 +----------
>  1 file changed, 1 insertion(+), 10 deletions(-)
>
> diff --git a/drivers/gpio/gpio-xgene.c b/drivers/gpio/gpio-xgene.c
> index 532b0df8a1f2..fb4b0c67aeef 100644
> --- a/drivers/gpio/gpio-xgene.c
> +++ b/drivers/gpio/gpio-xgene.c
> @@ -159,7 +159,6 @@ static SIMPLE_DEV_PM_OPS(xgene_gpio_pm, xgene_gpio_suspend, xgene_gpio_resume);
>  static int xgene_gpio_probe(struct platform_device *pdev)
>  {
>         struct xgene_gpio *gpio;
> -       int err = 0;
>
>         gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
>         if (!gpio)
> @@ -183,15 +182,7 @@ static int xgene_gpio_probe(struct platform_device *pdev)
>
>         platform_set_drvdata(pdev, gpio);
>
> -       err = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
> -       if (err) {
> -               dev_err(&pdev->dev,
> -                       "failed to register gpiochip.\n");
> -               return err;
> -       }
> -
> -       dev_info(&pdev->dev, "X-Gene GPIO driver registered.\n");
> -       return 0;
> +       return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
>  }
>
>  static const struct of_device_id xgene_gpio_of_match[] = {
> --
> 2.31.1
>

Applied, thanks.

For the future: the subject should be: "gpio: xgene: ..." here and
everywhere else.

Bart