linux-kernel - Re: [PATCH 07/13] irqchip/mvebu-pic: Convert to platform remove callback returning void

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Date: Tue, 27 Feb 2024 17:44:04 +0100
From: Gregory CLEMENT <gregory.clement@...tlin.com>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 Thomas Gleixner
 <tglx@...utronix.de>
Cc: Andrew Lunn <andrew@...n.ch>, Sebastian Hesselbarth
 <sebastian.hesselbarth@...il.com>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, kernel@...gutronix.de
Subject: Re: [PATCH 07/13] irqchip/mvebu-pic: Convert to platform remove
 callback returning void

Uwe Kleine-König <u.kleine-koenig@...gutronix.de> writes:

> 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>

Acked-by: Gregory CLEMENT <gregory.clement@...tlin.com>

Thanks,

Gregory
> ---
>  drivers/irqchip/irq-mvebu-pic.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/irqchip/irq-mvebu-pic.c b/drivers/irqchip/irq-mvebu-pic.c
> index ef3d3646ccc2..57e3f99b61f5 100644
> --- a/drivers/irqchip/irq-mvebu-pic.c
> +++ b/drivers/irqchip/irq-mvebu-pic.c
> @@ -167,14 +167,12 @@ static int mvebu_pic_probe(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -static int mvebu_pic_remove(struct platform_device *pdev)
> +static void mvebu_pic_remove(struct platform_device *pdev)
>  {
>  	struct mvebu_pic *pic = platform_get_drvdata(pdev);
>  
>  	on_each_cpu(mvebu_pic_disable_percpu_irq, pic, 1);
>  	irq_domain_remove(pic->domain);
> -
> -	return 0;
>  }
>  
>  static const struct of_device_id mvebu_pic_of_match[] = {
> @@ -185,7 +183,7 @@ MODULE_DEVICE_TABLE(of, mvebu_pic_of_match);
>  
>  static struct platform_driver mvebu_pic_driver = {
>  	.probe  = mvebu_pic_probe,
> -	.remove = mvebu_pic_remove,
> +	.remove_new = mvebu_pic_remove,
>  	.driver = {
>  		.name = "mvebu-pic",
>  		.of_match_table = mvebu_pic_of_match,
> -- 
> 2.42.0
>

-- 
Gregory Clement, Bootlin
Embedded Linux and Kernel engineering
http://bootlin.com