media: ti: omap4iss: Use media_pipeline_for_each_entity()

Replace usage of the deprecated media graph walk API with the new
media_pipeline_for_each_entity() and media_pipeline_for_each_pad()
macros.

Even though the entity iterator may seem a better match when build the
entity bitmap in iss_video_stream(), it would not be more efficient as
it would still iterate internally over all pads. As the entity iterator
requires explicit iterator initialization and cleanup calls, the code
would be more complex.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/omap4iss/iss_video.c

@@ -201,39 +201,34 @@ iss_video_remote_subdev(struct iss_video *video, u32 *pad)
 
 /* Return a pointer to the ISS video instance at the far end of the pipeline. */
 static struct iss_video *
-iss_video_far_end(struct iss_video *video)
+iss_video_far_end(struct iss_video *video, struct iss_pipeline *pipe)
 {
-	struct media_graph graph;
-	struct media_entity *entity = &video->video.entity;
-	struct media_device *mdev = entity->graph_obj.mdev;
+	struct media_pipeline_entity_iter iter;
+	struct media_entity *entity;
 	struct iss_video *far_end = NULL;
+	int ret;
 
-	mutex_lock(&mdev->graph_mutex);
+	ret = media_pipeline_entity_iter_init(&pipe->pipe, &iter);
+	if (ret)
+		return ERR_PTR(-ENOMEM);
 
-	if (media_graph_walk_init(&graph, mdev)) {
-		mutex_unlock(&mdev->graph_mutex);
-		return NULL;
-	}
+	media_pipeline_for_each_entity(&pipe->pipe, &iter, entity) {
+		struct iss_video *other;
 
-	media_graph_walk_start(&graph, entity);
-
-	while ((entity = media_graph_walk_next(&graph))) {
 		if (entity == &video->video.entity)
 			continue;
 
 		if (!is_media_entity_v4l2_video_device(entity))
 			continue;
 
-		far_end = to_iss_video(media_entity_to_video_device(entity));
-		if (far_end->type != video->type)
+		other = to_iss_video(media_entity_to_video_device(entity));
+		if (other->type != video->type) {
+			far_end = other;
 			break;
-
-		far_end = NULL;
+		}
 	}
 
-	mutex_unlock(&mdev->graph_mutex);
-
-	media_graph_walk_cleanup(&graph);
+	media_pipeline_entity_iter_cleanup(&iter);
 
 	return far_end;
 }
@@ -850,12 +845,12 @@ iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 {
 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
 	struct iss_video *video = video_drvdata(file);
-	struct media_graph graph;
-	struct media_entity *entity = &video->video.entity;
-	struct media_device *mdev = entity->graph_obj.mdev;
+	struct media_device *mdev = video->video.entity.graph_obj.mdev;
+	struct media_pipeline_pad_iter iter;
 	enum iss_pipeline_state state;
 	struct iss_pipeline *pipe;
 	struct iss_video *far_end;
+	struct media_pad *pad;
 	unsigned long flags;
 	int ret;
 
@@ -873,13 +868,9 @@ iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 	pipe->external_rate = 0;
 	pipe->external_bpp = 0;
 
-	ret = media_entity_enum_init(&pipe->ent_enum, entity->graph_obj.mdev);
+	ret = media_entity_enum_init(&pipe->ent_enum, mdev);
 	if (ret)
-		goto err_graph_walk_init;
-
-	ret = media_graph_walk_init(&graph, entity->graph_obj.mdev);
-	if (ret)
-		goto err_graph_walk_init;
+		goto err_entity_enum_init;
 
 	if (video->iss->pdata->set_constraints)
 		video->iss->pdata->set_constraints(video->iss, true);
@@ -888,11 +879,8 @@ iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 	if (ret < 0)
 		goto err_media_pipeline_start;
 
-	mutex_lock(&mdev->graph_mutex);
-	media_graph_walk_start(&graph, entity);
-	while ((entity = media_graph_walk_next(&graph)))
-		media_entity_enum_set(&pipe->ent_enum, entity);
-	mutex_unlock(&mdev->graph_mutex);
+	media_pipeline_for_each_pad(&pipe->pipe, &iter, pad)
+		media_entity_enum_set(&pipe->ent_enum, pad->entity);
 
 	/*
 	 * Verify that the currently configured format matches the output of
@@ -909,7 +897,11 @@ iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 	 * Find the ISS video node connected at the far end of the pipeline and
 	 * update the pipeline.
 	 */
-	far_end = iss_video_far_end(video);
+	far_end = iss_video_far_end(video, pipe);
+	if (IS_ERR(far_end)) {
+		ret = PTR_ERR(far_end);
+		goto err_iss_video_check_format;
+	}
 
 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 		state = ISS_PIPELINE_STREAM_OUTPUT | ISS_PIPELINE_IDLE_OUTPUT;
@@ -966,8 +958,6 @@ iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 		spin_unlock_irqrestore(&video->qlock, flags);
 	}
 
-	media_graph_walk_cleanup(&graph);
-
 	mutex_unlock(&video->stream_lock);
 
 	return 0;
@@ -981,9 +971,7 @@ err_media_pipeline_start:
 		video->iss->pdata->set_constraints(video->iss, false);
 	video->queue = NULL;
 
-	media_graph_walk_cleanup(&graph);
-
-err_graph_walk_init:
+err_entity_enum_init:
 	media_entity_enum_cleanup(&pipe->ent_enum);
 
 	mutex_unlock(&video->stream_lock);