[PATCH] media: i2c: ov5647: fix power cleanup on remove

[Guangshuo Li <lgs201920130244@gmail.com>]

ov5647_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 external
clock and regulators can remain enabled and the power-down GPIO can
remain deasserted.

After disabling runtime PM, call ov5647_power_off() 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 powered off the
sensor.

This issue was found by manual code inspection.

Fixes: 089b7c70f0d8 ("media: ov5647: Use pm_runtime infrastructure")
Cc: stable@vger.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
---
 drivers/media/i2c/ov5647.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
index 3facf92b3841..d42d009772ac 100644
--- a/drivers/media/i2c/ov5647.c
+++ b/drivers/media/i2c/ov5647.c
@@ -1271,6 +1271,9 @@ static void ov5647_remove(struct i2c_client *client)
 	v4l2_ctrl_handler_free(&sensor->ctrls);
 	v4l2_device_unregister_subdev(sd);
 	pm_runtime_disable(&client->dev);
+	if (!pm_runtime_status_suspended(&client->dev))
+		ov5647_power_off(&client->dev);
+	pm_runtime_set_suspended(&client->dev);
 }
 
 static const struct dev_pm_ops ov5647_pm_ops = {
-- 
2.43.0