linux-kernel - Re: [PATCH v3] counter: ti-ecap-capture: Use devm_pm_runtime

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Message-ID: <c3277f21-14c4-40ca-9d48-a0aeecb54fb8@ti.com>
Date: Thu, 7 Aug 2025 08:56:28 -0500
From: Andrew Davis <afd@...com>
To: Waqar Hameed <waqar.hameed@...s.com>,
        Vignesh Raghavendra
	<vigneshr@...com>,
        Julien Panis <jpanis@...libre.com>,
        William Breathitt Gray
	<wbg@...nel.org>
CC: <kernel@...s.com>, <linux-iio@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] counter: ti-ecap-capture: Use devm_pm_runtime_enable()

On 8/7/25 8:21 AM, Waqar Hameed wrote:
> There is no need to register a manual `devm` action for
> `pm_runtime_disable()` when `devm_pm_runtime_enable()` exists. It does
> the same thing (but also calls `pm_runtime_dont_use_autosuspend()`,
> which should be fine here).
> 
> Moreover, when `devm_add_action_or_reset()` fails, it is due to a failed
> memory allocation and will thus return `-ENOMEM`. `dev_err_probe()`
> doesn't do anything when error is `-ENOMEM`. Therefore, the call to
> `dev_err_probe()` is useless. Note that `devm_pm_runtime_enable()` has a
> tail call to `devm_add_action_or_reset()` and thus returns that value.
> Therefore, replace `dev_err_probe()` with the returning value.
> 
> Signed-off-by: Waqar Hameed <waqar.hameed@...s.com>
> ---

Acked-by: Andrew Davis <afd@...com>

> Changes in v3:
> 
> * Remove the manual `devm_add_action_or_reset()` and use
>    `devm_pm_runtime_enable()` instead.
>    
> Link to v2: https://lore.kernel.org/lkml/pndms8em7tf.a.out@axis.com/
> 
> Changes in v2:
> 
> * Split the patch to one seperate patch for each sub-system.
> 
> Link to v1: https://lore.kernel.org/all/pnd7c0s6ji2.fsf@axis.com/
> 
> drivers/counter/ti-ecap-capture.c | 12 ++----------
>   1 file changed, 2 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/counter/ti-ecap-capture.c b/drivers/counter/ti-ecap-capture.c
> index 3faaf7f60539..3586a7ab9887 100644
> --- a/drivers/counter/ti-ecap-capture.c
> +++ b/drivers/counter/ti-ecap-capture.c
> @@ -465,11 +465,6 @@ static irqreturn_t ecap_cnt_isr(int irq, void *dev_id)
>   	return IRQ_HANDLED;
>   }
>   
> -static void ecap_cnt_pm_disable(void *dev)
> -{
> -	pm_runtime_disable(dev);
> -}
> -
>   static int ecap_cnt_probe(struct platform_device *pdev)
>   {
>   	struct device *dev = &pdev->dev;
> @@ -523,12 +518,9 @@ static int ecap_cnt_probe(struct platform_device *pdev)
>   
>   	platform_set_drvdata(pdev, counter_dev);
>   
> -	pm_runtime_enable(dev);
> -
> -	/* Register a cleanup callback to care for disabling PM */
> -	ret = devm_add_action_or_reset(dev, ecap_cnt_pm_disable, dev);
> +	ret = devm_pm_runtime_enable(dev);
>   	if (ret)
> -		return dev_err_probe(dev, ret, "failed to add pm disable action\n");
> +		return ret;
>   
>   	ret = devm_counter_add(dev, counter_dev);
>   	if (ret)
> 
> base-commit: 260f6f4fda93c8485c8037865c941b42b9cba5d2