[PATCH] media: i2c: ov5648: Fix a data race on state->streaming

[Ginger Li]

ov5648_s_stream() updates state->streaming after it has released
sensor->mutex, while ov5648_resume() reads that field with sensor->mutex
held.  A concurrent resume can therefore observe a stale streaming state and
leave the sensor in standby while the software believes that it is streaming,
or the other way around.

Keep the update inside the sensor->mutex protected section that already
programs the standby mode.

Fixes: e43ccb0a045f ("media: i2c: Add support for the OV5648 image sensor")
Signed-off-by: Ginger Li <ginger.jzllee@xxxxxxxxx>
---
 drivers/media/i2c/ov5648.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/ov5648.c b/drivers/media/i2c/ov5648.c
--- a/drivers/media/i2c/ov5648.c
+++ b/drivers/media/i2c/ov5648.c
@@ -2145,12 +2145,12 @@ static int ov5648_s_stream(struct v4l2_subdev *subdev,
 
 	mutex_lock(&sensor->mutex);
 	ret = ov5648_sw_standby(sensor, !enable);
+	if (!ret)
+		state->streaming = !!enable;
 	mutex_unlock(&sensor->mutex);
 
 	if (ret)
 		return ret;
-
-	state->streaming = !!enable;
 
 	if (!enable)
 		pm_runtime_put(sensor->dev);
-- 
2.43.0