media: i2c: ov7740: Drop check for reentrant .s_stream()

The subdev .s_stream() operation shall not be called to start streaming
on an already started subdev, or stop streaming on a stopped subdev.
Remove the check that guards against that condition.

The streaming field of the driver's private structure is now unused,
drop it as well.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/i2c/ov7740.c

@@ -118,7 +118,6 @@ struct ov7740 {
 	struct v4l2_ctrl *contrast;
 
 	struct mutex mutex;	/* To serialize asynchronus callbacks */
-	bool streaming;		/* Streaming on/off */
 
 	struct gpio_desc *resetb_gpio;
 	struct gpio_desc *pwdn_gpio;
@@ -616,10 +615,6 @@ static int ov7740_set_stream(struct v4l2_subdev *sd, int enable)
 	int ret = 0;
 
 	mutex_lock(&ov7740->mutex);
-	if (ov7740->streaming == enable) {
-		mutex_unlock(&ov7740->mutex);
-		return 0;
-	}
 
 	if (enable) {
 		ret = pm_runtime_resume_and_get(&client->dev);
@@ -633,8 +628,6 @@ static int ov7740_set_stream(struct v4l2_subdev *sd, int enable)
 		pm_runtime_put(&client->dev);
 	}
 
-	ov7740->streaming = enable;
-
 	mutex_unlock(&ov7740->mutex);
 	return ret;