linux-kernel - Re: [PATCH 17/19] cpufreq: acpi: Convert to platform remove callback returning void

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Date:   Fri, 14 Jul 2023 20:57:15 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Yangtao Li <frank.li@...o.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 17/19] cpufreq: acpi: Convert to platform remove callback
 returning void

On Wed, Jul 12, 2023 at 11:34 AM Yangtao Li <frank.li@...o.com> wrote:
>
> The .remove() callback for a platform driver returns an int which makes
> many driver authors wrongly assume it's possible to do error handling by
> returning an error code. However the value returned is (mostly) ignored
> and this typically results in resource leaks. To improve here there is a
> quest to make the remove callback return void. In the first step of this
> quest all drivers are converted to .remove_new() which already returns
> void.
>
> Trivially convert this driver from always returning zero in the remove
> callback to the void returning variant.
>
> Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Signed-off-by: Yangtao Li <frank.li@...o.com>

Acked-by: Rafael J. Wysocki <rafael@...nel.org>

or please let me know if you want me to pick this up.

Thanks!

> ---
>  drivers/cpufreq/acpi-cpufreq.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
> index b2f05d27167e..37f1cdf46d29 100644
> --- a/drivers/cpufreq/acpi-cpufreq.c
> +++ b/drivers/cpufreq/acpi-cpufreq.c
> @@ -1011,22 +1011,20 @@ static int __init acpi_cpufreq_probe(struct platform_device *pdev)
>         return ret;
>  }
>
> -static int acpi_cpufreq_remove(struct platform_device *pdev)
> +static void acpi_cpufreq_remove(struct platform_device *pdev)
>  {
>         pr_debug("%s\n", __func__);
>
>         cpufreq_unregister_driver(&acpi_cpufreq_driver);
>
>         free_acpi_perf_data();
> -
> -       return 0;
>  }
>
>  static struct platform_driver acpi_cpufreq_platdrv = {
>         .driver = {
>                 .name   = "acpi-cpufreq",
>         },
> -       .remove         = acpi_cpufreq_remove,
> +       .remove_new     = acpi_cpufreq_remove,
>  };
>
>  static int __init acpi_cpufreq_init(void)
> --
> 2.39.0
>