linux-kernel - Re: [PATCH 06/12] bus: sun50i-de2: Convert to platform remove callback returning void

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Message-ID: <20231110101809.78f64217@donnerap.manchester.arm.com>
Date:   Fri, 10 Nov 2023 10:18:09 +0000
From:   Andre Przywara <andre.przywara@....com>
To:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Cc:     Arnd Bergmann <arnd@...db.de>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH 06/12] bus: sun50i-de2: Convert to platform remove
 callback returning void

On Thu,  9 Nov 2023 21:28:36 +0100
Uwe Kleine-König <u.kleine-koenig@...gutronix.de> wrote:

Hi,

> 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 ignored (apart
> from emitting a warning) 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. Eventually after all drivers
> are converted, .remove_new() will be renamed to .remove().
> 
> Trivially convert this driver from always returning zero in the remove
> callback to the void returning variant.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Reviewed-by: Andre Przywara <andre.przywara@....com>

Cheers,
Andre

> ---
>  drivers/bus/sun50i-de2.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/bus/sun50i-de2.c b/drivers/bus/sun50i-de2.c
> index 414f29cdedf0..3339311ce068 100644
> --- a/drivers/bus/sun50i-de2.c
> +++ b/drivers/bus/sun50i-de2.c
> @@ -24,10 +24,9 @@ static int sun50i_de2_bus_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static int sun50i_de2_bus_remove(struct platform_device *pdev)
> +static void sun50i_de2_bus_remove(struct platform_device *pdev)
>  {
>  	sunxi_sram_release(&pdev->dev);
> -	return 0;
>  }
>  
>  static const struct of_device_id sun50i_de2_bus_of_match[] = {
> @@ -37,7 +36,7 @@ static const struct of_device_id sun50i_de2_bus_of_match[] = {
>  
>  static struct platform_driver sun50i_de2_bus_driver = {
>  	.probe = sun50i_de2_bus_probe,
> -	.remove = sun50i_de2_bus_remove,
> +	.remove_new = sun50i_de2_bus_remove,
>  	.driver = {
>  		.name = "sun50i-de2-bus",
>  		.of_match_table = sun50i_de2_bus_of_match,