linux-kernel - Re: [PATCH 05/14] Input: samsung-keypad

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Message-ID: <bkkh2as5v44nldhpnmswt7pssiude6ddci7v5nvzqhba6xxbnj@veoftlgrhu6p>
Date: Mon, 19 Aug 2024 14:54:39 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>, 
	linux-input@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, patches@...nsource.cirrus.com
Subject: Re: [PATCH 05/14] Input: samsung-keypad - use devm to disable
 runtime PM

On Sun, Aug 18, 2024 at 09:58:02PM -0700, Dmitry Torokhov wrote:
> To make sure that runtime PM is disabled at the right time relative
> to all other devm-managed resources use devm_add_action_or_reset()
> to register a handler that will disable it.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>  drivers/input/keyboard/samsung-keypad.c | 24 +++++++++++++-----------
>  1 file changed, 13 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/input/keyboard/samsung-keypad.c b/drivers/input/keyboard/samsung-keypad.c
> index 7adcd2657bca..924327de4d8f 100644
> --- a/drivers/input/keyboard/samsung-keypad.c
> +++ b/drivers/input/keyboard/samsung-keypad.c
> @@ -310,6 +310,13 @@ samsung_keypad_parse_dt(struct device *dev)
>  }
>  #endif
>  
> +static void samsung_disable_runtime_pm(void *data)
> +{
> +	struct samsung_keypad *keypad = data;
> +
> +	pm_runtime_disable(&keypad->pdev->dev);
> +}
> +
>  static int samsung_keypad_probe(struct platform_device *pdev)
>  {
>  	const struct samsung_keypad_platdata *pdata;
> @@ -420,11 +427,16 @@ static int samsung_keypad_probe(struct platform_device *pdev)
>  
>  	device_init_wakeup(&pdev->dev, pdata->wakeup);
>  	platform_set_drvdata(pdev, keypad);
> +
>  	pm_runtime_enable(&pdev->dev);
> +	error = devm_add_action_or_reset(&pdev->dev, samsung_disable_runtime_pm,
> +					 keypad);
> +	if (error)
> +		return error;

I think you are open-coding devm_pm_runtime_enable().