linux-kernel - Re: [PATCH 3/3] reset: ti-sci: Convert to platform remove callback returning void

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Date: Wed, 6 Mar 2024 14:49:17 -0600
From: Nishanth Menon <nm@...com>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
CC: Philipp Zabel <p.zabel@...gutronix.de>, Tero Kristo <kristo@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...gutronix.de>
Subject: Re: [PATCH 3/3] reset: ti-sci: Convert to platform remove callback
 returning void

On 22:32-20240305, Uwe Kleine-König 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>
> ---

Thanks.

Reviewed-by: Nishanth Menon <nm@...com>

>  drivers/reset/reset-ti-sci.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/reset/reset-ti-sci.c b/drivers/reset/reset-ti-sci.c
> index cc01fa5b0bea..d384da0982fa 100644
> --- a/drivers/reset/reset-ti-sci.c
> +++ b/drivers/reset/reset-ti-sci.c
> @@ -235,20 +235,18 @@ static int ti_sci_reset_probe(struct platform_device *pdev)
>  	return reset_controller_register(&data->rcdev);
>  }
>  
> -static int ti_sci_reset_remove(struct platform_device *pdev)
> +static void ti_sci_reset_remove(struct platform_device *pdev)
>  {
>  	struct ti_sci_reset_data *data = platform_get_drvdata(pdev);
>  
>  	reset_controller_unregister(&data->rcdev);
>  
>  	idr_destroy(&data->idr);
> -
> -	return 0;
>  }
>  
>  static struct platform_driver ti_sci_reset_driver = {
>  	.probe = ti_sci_reset_probe,
> -	.remove = ti_sci_reset_remove,
> +	.remove_new = ti_sci_reset_remove,
>  	.driver = {
>  		.name = "ti-sci-reset",
>  		.of_match_table = ti_sci_reset_of_match,
> -- 
> 2.43.0
> 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D