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

[Dmitry Torokhov]

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@xxxxxxxxxx>
> ---
>  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