linux-kernel - [PATCH] [v2] iio: proximity: pulsedlight: Fix rumtime PM imbalance on error

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Message-Id: <20210412053204.4889-1-dinghao.liu@zju.edu.cn>
Date:   Mon, 12 Apr 2021 13:32:02 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Matt Ranostay <matt.ranostay@...sulko.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] iio: proximity: pulsedlight: Fix rumtime PM imbalance on error

When lidar_write_control() fails, a pairing PM usage counter
decrement is needed to keep the counter balanced.

Fixes: 4ac4e086fd8c5 ("iio: pulsedlight-lidar-lite: add runtime PM")
Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---

Changelog:

v2: - Add the fix tag.
---
 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;
 	}
 
-- 
2.17.1