linux-kernel - Re: [PATCH] iio: proximity: pulsedlight: Fix rumtime PM imbalance on error

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Message-ID: <20210411161116.5f99195d@jic23-huawei>
Date:   Sun, 11 Apr 2021 16:11:51 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu, Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Matt Ranostay <matt.ranostay@...sulko.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: proximity: pulsedlight: Fix rumtime PM imbalance
 on error

On Wed,  7 Apr 2021 12:59:35 +0800
Dinghao Liu <dinghao.liu@....edu.cn> wrote:

> When lidar_write_control() fails, a pairing PM usage counter
> decrement is needed to keep the counter balanced.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>

Hi, patch content looks good but it needs a fixes tag so we know how far to backport it.
Please add for v2.

Thanks,

Jonathan

> ---
>  drivers/iio/proximity/pulsedlight-lidar-lite-v2.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/iio/proximity/pulsedlight-lidar-lite-v2.c b/drivers/iio/proximity/pulsedlight-lidar-lite-v2.c
> index c685f10b5ae4..cc206bfa09c7 100644
> --- a/drivers/iio/proximity/pulsedlight-lidar-lite-v2.c
> +++ b/drivers/iio/proximity/pulsedlight-lidar-lite-v2.c
> @@ -160,6 +160,7 @@ static int lidar_get_measurement(struct lidar_data *data, u16 *reg)
>  	ret = lidar_write_control(data, LIDAR_REG_CONTROL_ACQUIRE);
>  	if (ret < 0) {
>  		dev_err(&client->dev, "cannot send start measurement command");
> +		pm_runtime_put_noidle(&client->dev);
>  		return ret;
>  	}
>