linux-kernel - Re: [PATCH 10/11] firmware: turris-mox-rwtm: Convert to platform remove callback returning void

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Message-ID: <20231228163254.72b770ba@dellmb>
Date: Thu, 28 Dec 2023 16:32:54 +0100
From: Marek Behún <kabel@...nel.org>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: kernel@...gutronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/11] firmware: turris-mox-rwtm: Convert to platform
 remove callback returning void

On Wed, 27 Dec 2023 17:26:34 +0100
Uwe Kleine-König <u.kleine-koenig@...gutronix.de> 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 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>
> ---
>  drivers/firmware/turris-mox-rwtm.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/firmware/turris-mox-rwtm.c b/drivers/firmware/turris-mox-rwtm.c
> index 2de0fb139ce1..31d962cdd6eb 100644
> --- a/drivers/firmware/turris-mox-rwtm.c
> +++ b/drivers/firmware/turris-mox-rwtm.c
> @@ -554,7 +554,7 @@ static int turris_mox_rwtm_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> -static int turris_mox_rwtm_remove(struct platform_device *pdev)
> +static void turris_mox_rwtm_remove(struct platform_device *pdev)
>  {
>  	struct mox_rwtm *rwtm = platform_get_drvdata(pdev);
>  
> @@ -562,8 +562,6 @@ static int turris_mox_rwtm_remove(struct platform_device *pdev)
>  	sysfs_remove_files(rwtm_to_kobj(rwtm), mox_rwtm_attrs);
>  	kobject_put(rwtm_to_kobj(rwtm));
>  	mbox_free_channel(rwtm->mbox);
> -
> -	return 0;
>  }
>  
>  static const struct of_device_id turris_mox_rwtm_match[] = {
> @@ -576,7 +574,7 @@ MODULE_DEVICE_TABLE(of, turris_mox_rwtm_match);
>  
>  static struct platform_driver turris_mox_rwtm_driver = {
>  	.probe	= turris_mox_rwtm_probe,
> -	.remove	= turris_mox_rwtm_remove,
> +	.remove_new = turris_mox_rwtm_remove,
>  	.driver	= {
>  		.name		= DRIVER_NAME,
>  		.of_match_table	= turris_mox_rwtm_match,

Reviewed-by: Marek Behún <kabel@...nel.org>