[PATCH] media: i2c: ov2740: fix power cleanup on remove

[Guangshuo Li]

ov2740_remove() disables runtime PM without powering off the sensor if
it is still runtime active or updating the runtime PM state to
suspended.

pm_runtime_disable() prevents further runtime PM callbacks and waits for
pending operations, but it does not force the runtime suspend callback
to run. If the sensor is active when the driver is removed, the reset
and powerdown GPIOs can remain deasserted and the clock and regulators
can remain enabled.

After disabling runtime PM, call ov2740_suspend() if the device is not
already runtime suspended, and then mark the runtime PM state as
suspended. Checking the runtime status avoids disabling the hardware
resources a second time when runtime PM has already suspended the
sensor.

This issue was found by manual code inspection.

Fixes: 1a140854bc8c ("media: ov2740: Add support for reset GPIO")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 drivers/media/i2c/ov2740.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/i2c/ov2740.c b/drivers/media/i2c/ov2740.c
index 39003c1632ad..a5346adf2281 100644
--- a/drivers/media/i2c/ov2740.c
+++ b/drivers/media/i2c/ov2740.c
@@ -1198,6 +1198,8 @@ static int ov2740_check_hwcfg(struct ov2740 *ov2740)
 	return ret;
 }
 
+static int ov2740_suspend(struct device *dev);
+
 static void ov2740_remove(struct i2c_client *client)
 {
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
@@ -1207,6 +1209,9 @@ static void ov2740_remove(struct i2c_client *client)
 	v4l2_subdev_cleanup(sd);
 	v4l2_ctrl_handler_free(sd->ctrl_handler);
 	pm_runtime_disable(&client->dev);
+	if (!pm_runtime_status_suspended(&client->dev))
+		ov2740_suspend(&client->dev);
+	pm_runtime_set_suspended(&client->dev);
 }
 
 static int ov2740_nvmem_read(void *priv, unsigned int off, void *val,
-- 
2.43.0