linux-kernel - Re: [PATCH] watchdog: starfive: Check pm_runtime_enabled() before decrementing usage counter

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Date: Fri, 19 Jan 2024 04:53:19 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Ji Sheng Teoh <jisheng.teoh@...rfivetech.com>,
 Xingyu Wu <xingyu.wu@...rfivetech.com>,
 Samin Guo <samin.guo@...rfivetech.com>,
 Wim Van Sebroeck <wim@...ux-watchdog.org>,
 Emil Renner Berthing <emil.renner.berthing@...onical.com>
Cc: Ley Foon Tan <leyfoon.tan@...rfivetech.com>,
 linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] watchdog: starfive: Check pm_runtime_enabled() before
 decrementing usage counter

On 1/19/24 00:27, Ji Sheng Teoh wrote:
> In the probe function, pm_runtime_put_sync() will fail on platform with
> runtime PM disabled.
> Check if runtime PM is enabled before calling pm_runtime_put_sync() to
> fix it.
> 
> Fixes: db728ea9c7be ("drivers: watchdog: Add StarFive Watchdog driver")
> Signed-off-by: Xingyu Wu <xingyu.wu@...rfivetech.com>
> Signed-off-by: Ley Foon Tan <leyfoon.tan@...rfivetech.com>
> Signed-off-by: Ji Sheng Teoh <jisheng.teoh@...rfivetech.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

Guenter

> ---
>   drivers/watchdog/starfive-wdt.c | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/watchdog/starfive-wdt.c b/drivers/watchdog/starfive-wdt.c
> index e28ead24c520..df68ae4acbd7 100644
> --- a/drivers/watchdog/starfive-wdt.c
> +++ b/drivers/watchdog/starfive-wdt.c
> @@ -494,8 +494,13 @@ static int starfive_wdt_probe(struct platform_device *pdev)
>   	if (ret)
>   		goto err_exit;
>   
> -	if (!early_enable)
> -		pm_runtime_put_sync(&pdev->dev);
> +	if (!early_enable) {
> +		if (pm_runtime_enabled(&pdev->dev)) {
> +			ret = pm_runtime_put_sync(&pdev->dev);
> +			if (ret)
> +				goto err_exit;
> +		}
> +	}
>   
>   	return 0;
>