media: mc: Rename pad as origin in __media_pipeline_start()

Rename the pad field in __media_pipeline_start() to both better describe
what it is and avoid masking it during the loop.

Signed-off-by: Sakari Ailus <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/mc/mc-entity.c

···
 	return ret;
 }
 
-__must_check int __media_pipeline_start(struct media_pad *pad,
+__must_check int __media_pipeline_start(struct media_pad *origin,
 					struct media_pipeline *pipe)
 {
-	struct media_device *mdev = pad->graph_obj.mdev;
+	struct media_device *mdev = origin->graph_obj.mdev;
 	struct media_pipeline_pad *err_ppad;
 	struct media_pipeline_pad *ppad;
 	int ret;
···
 	 * If the pad is already part of a pipeline, that pipeline must be the
 	 * same as the pipe given to media_pipeline_start().
 	 */
-	if (WARN_ON(pad->pipe && pad->pipe != pipe))
+	if (WARN_ON(origin->pipe && origin->pipe != pipe))
 		return -EINVAL;
 
 	/*
···
 	 * with media_pipeline_pad instances for each pad found during graph
 	 * walk.
 	 */
-	ret = media_pipeline_populate(pipe, pad);
+	ret = media_pipeline_populate(pipe, origin);
 	if (ret)
 		return ret;
 
···
 }
 EXPORT_SYMBOL_GPL(__media_pipeline_start);
 
-__must_check int media_pipeline_start(struct media_pad *pad,
+__must_check int media_pipeline_start(struct media_pad *origin,
 				      struct media_pipeline *pipe)
 {
-	struct media_device *mdev = pad->graph_obj.mdev;
+	struct media_device *mdev = origin->graph_obj.mdev;
 	int ret;
 
 	mutex_lock(&mdev->graph_mutex);
-	ret = __media_pipeline_start(pad, pipe);
+	ret = __media_pipeline_start(origin, pipe);
 	mutex_unlock(&mdev->graph_mutex);
 	return ret;
 }

include/media/media-entity.h

···
 
 /**
  * media_pipeline_start - Mark a pipeline as streaming
- * @pad: Starting pad
+ * @origin: Starting pad
  * @pipe: Media pipeline to be assigned to all pads in the pipeline.
  *
- * Mark all pads connected to a given pad through enabled links, either
+ * Mark all pads connected to pad @origin through enabled links, either
  * directly or indirectly, as streaming. The given pipeline object is assigned
  * to every pad in the pipeline and stored in the media_pad pipe field.
  *
···
  * pipeline pointer must be identical for all nested calls to
  * media_pipeline_start().
  */
-__must_check int media_pipeline_start(struct media_pad *pad,
+__must_check int media_pipeline_start(struct media_pad *origin,
 				      struct media_pipeline *pipe);
 /**
  * __media_pipeline_start - Mark a pipeline as streaming
  *
- * @pad: Starting pad
+ * @origin: Starting pad
  * @pipe: Media pipeline to be assigned to all pads in the pipeline.
  *
  * ..note:: This is the non-locking version of media_pipeline_start()
  */
-__must_check int __media_pipeline_start(struct media_pad *pad,
+__must_check int __media_pipeline_start(struct media_pad *origin,
 					struct media_pipeline *pipe);
 
 /**