linux-kernel - Re: [PATCH] Input: cyapa - Fix rumtime PM imbalance on error

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Date:   Wed, 7 Apr 2021 23:19:44 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu, Fuqian Huang <huangfq.daxian@...il.com>,
        Benson Leung <bleung@...omium.org>,
        Andrzej Pietrasiewicz <andrzej.p@...labora.com>,
        Lee Jones <lee.jones@...aro.org>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: cyapa - Fix rumtime PM imbalance on error

Hi Dinghao,

On Wed, Apr 07, 2021 at 12:07:38PM +0800, Dinghao Liu wrote:
> When mutex_lock_interruptible() fails, a pairing PM usage
> counter decrement is needed to keep the counter balanced.

Thank you for the patch.

> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/input/mouse/cyapa.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
> index 77cc653edca2..e411ab45a218 100644
> --- a/drivers/input/mouse/cyapa.c
> +++ b/drivers/input/mouse/cyapa.c
> @@ -904,8 +904,10 @@ static ssize_t cyapa_update_rt_suspend_scanrate(struct device *dev,
>  	pm_runtime_get_sync(dev);
>  
>  	error = mutex_lock_interruptible(&cyapa->state_sync_lock);
> -	if (error)
> +	if (error) {
> +		pm_runtime_put_noidle(dev);

Why "noidle" and not pm_runtime_put_sync_autosuspend() like we do in
case of normal flow?

>  		return error;
> +	}
>  
>  	cyapa->runtime_suspend_sleep_time = min_t(u16, time, 1000);
>  	cyapa->runtime_suspend_power_mode =
> -- 
> 2.17.1
> 

Thanks.

-- 
Dmitry