linux-kernel - Re: [PATCH 40/40] soc/xilinx: zynqmp_power: Convert to platform remove callback returning void

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Date:   Mon, 2 Oct 2023 11:13:51 +0200
From:   Michal Simek <michal.simek@....com>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
CC:     Rob Herring <robh@...nel.org>, Ruan Jinjie <ruanjinjie@...wei.com>,
        Arnd Bergmann <arnd@...db.de>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kernel@...gutronix.de>
Subject: Re: [PATCH 40/40] soc/xilinx: zynqmp_power: Convert to platform
 remove callback returning void



On 9/25/23 11:55, 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>
> ---
>   drivers/soc/xilinx/zynqmp_power.c | 6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/soc/xilinx/zynqmp_power.c b/drivers/soc/xilinx/zynqmp_power.c
> index c2c819701eec..9d27f850f491 100644
> --- a/drivers/soc/xilinx/zynqmp_power.c
> +++ b/drivers/soc/xilinx/zynqmp_power.c
> @@ -275,7 +275,7 @@ static int zynqmp_pm_probe(struct platform_device *pdev)
>   	return 0;
>   }
>   
> -static int zynqmp_pm_remove(struct platform_device *pdev)
> +static void zynqmp_pm_remove(struct platform_device *pdev)
>   {
>   	sysfs_remove_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
>   	if (event_registered)
> @@ -283,8 +283,6 @@ static int zynqmp_pm_remove(struct platform_device *pdev)
>   
>   	if (!rx_chan)
>   		mbox_free_channel(rx_chan);
> -
> -	return 0;
>   }
>   
>   static const struct of_device_id pm_of_match[] = {
> @@ -295,7 +293,7 @@ MODULE_DEVICE_TABLE(of, pm_of_match);
>   
>   static struct platform_driver zynqmp_pm_platform_driver = {
>   	.probe = zynqmp_pm_probe,
> -	.remove = zynqmp_pm_remove,
> +	.remove_new = zynqmp_pm_remove,
>   	.driver = {
>   		.name = "zynqmp_power",
>   		.of_match_table = pm_of_match,

Applied only this patch.
Thanks,
Michal