linux-kernel - Re: [PATCH 01/19] cpufreq: sun50i: Convert to platform remove callback returning void

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Date:   Wed, 12 Jul 2023 18:05:40 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     Yangtao Li <tiny.windzz@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        Yangtao Li <frank.li@...o.com>
Cc:     Yangtao Li <frank.li@...o.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/19] cpufreq: sun50i: Convert to platform remove callback
 returning void

Dne sreda, 12. julij 2023 ob 11:33:04 CEST je Yangtao Li napisal(a):
> 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: Jernej Škrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

> ---
>  drivers/cpufreq/sun50i-cpufreq-nvmem.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/cpufreq/sun50i-cpufreq-nvmem.c
> b/drivers/cpufreq/sun50i-cpufreq-nvmem.c index 4321d7bbe769..32a9c88f8ff6
> 100644
> --- a/drivers/cpufreq/sun50i-cpufreq-nvmem.c
> +++ b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
> @@ -137,7 +137,7 @@ static int sun50i_cpufreq_nvmem_probe(struct
> platform_device *pdev) return ret;
>  }
> 
> -static int sun50i_cpufreq_nvmem_remove(struct platform_device *pdev)
> +static void sun50i_cpufreq_nvmem_remove(struct platform_device *pdev)
>  {
>  	int *opp_tokens = platform_get_drvdata(pdev);
>  	unsigned int cpu;
> @@ -148,13 +148,11 @@ static int sun50i_cpufreq_nvmem_remove(struct
> platform_device *pdev) dev_pm_opp_put_prop_name(opp_tokens[cpu]);
> 
>  	kfree(opp_tokens);
> -
> -	return 0;
>  }
> 
>  static struct platform_driver sun50i_cpufreq_driver = {
>  	.probe = sun50i_cpufreq_nvmem_probe,
> -	.remove = sun50i_cpufreq_nvmem_remove,
> +	.remove_new = sun50i_cpufreq_nvmem_remove,
>  	.driver = {
>  		.name = "sun50i-cpufreq-nvmem",
>  	},