linux-kernel - Re: [PATCH] clk: imx: imx8mp: Convert to platform remove callback returning void

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Date: Wed, 1 May 2024 14:39:31 +0300
From: Abel Vesa <abel.vesa@...aro.org>
To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: Abel Vesa <abelvesa@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Shengjiu Wang <shengjiu.wang@....com>, Peng Fan <peng.fan@....com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, linux-clk@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] clk: imx: imx8mp: Convert to platform remove callback
 returning void

On 24-04-23 09:12:31, 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.
> 
> Fixes: 1496dd413b2e ("clk: imx: imx8mp: Add pm_runtime support for power saving")
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

LGTM.

Reviewed-by: Abel Vesa <abel.vesa@...aro.org>

> ---
> Hello,
> 
> after the merge window leading to v6.10-rc1 (assuming Linus has >= 10 fingers
> this cycle :-) I want to switch the prototype of struct
> platform_driver::remove to return void. So please either merge this
> patch together with 1496dd413b2e, or accept me sending this patch
> together with the patch changing the function's prototype for inclusion
> to Greg's driver-core tree.

Sure, will apply it today.

> 
> Thanks
> Uwe
> 
>  drivers/clk/imx/clk-imx8mp-audiomix.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clk/imx/clk-imx8mp-audiomix.c b/drivers/clk/imx/clk-imx8mp-audiomix.c
> index 574a032309c1..be9df93b6adb 100644
> --- a/drivers/clk/imx/clk-imx8mp-audiomix.c
> +++ b/drivers/clk/imx/clk-imx8mp-audiomix.c
> @@ -346,11 +346,9 @@ static int clk_imx8mp_audiomix_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> -static int clk_imx8mp_audiomix_remove(struct platform_device *pdev)
> +static void clk_imx8mp_audiomix_remove(struct platform_device *pdev)
>  {
>  	pm_runtime_disable(&pdev->dev);
> -
> -	return 0;
>  }
>  
>  static int clk_imx8mp_audiomix_runtime_suspend(struct device *dev)
> @@ -382,7 +380,7 @@ MODULE_DEVICE_TABLE(of, clk_imx8mp_audiomix_of_match);
>  
>  static struct platform_driver clk_imx8mp_audiomix_driver = {
>  	.probe	= clk_imx8mp_audiomix_probe,
> -	.remove = clk_imx8mp_audiomix_remove,
> +	.remove_new = clk_imx8mp_audiomix_remove,
>  	.driver = {
>  		.name = "imx8mp-audio-blk-ctrl",
>  		.of_match_table = clk_imx8mp_audiomix_of_match,
> -- 
> 2.43.0
>