239  * Graph traversal
292 static void stack_push(struct media_graph *graph,  in stack_push()  argument
295 	if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) {  in stack_push()
299 	graph->top++;  in stack_push()
300 	graph->stack[graph->top].link = entity->links.next;  in stack_push()
301 	graph->stack[graph->top].entity = entity;  in stack_push()
304 static struct media_entity *stack_pop(struct media_graph *graph)  in stack_pop()  argument
308 	entity = graph->stack[graph->top].entity;  in stack_pop()
309 	graph->top--;  in stack_pop()
318  * media_graph_walk_init - Allocate resources for graph walk
319  * @graph: Media graph structure that will be used to walk the graph
322  * Reserve resources for graph walk in media device's current
329 	struct media_graph *graph, struct media_device *mdev)  in media_graph_walk_init()  argument
331 	return media_entity_enum_init(&graph->ent_enum, mdev);  in media_graph_walk_init()
336  * media_graph_walk_cleanup - Release resources related to graph walking
337  * @graph: Media graph structure that was used to walk the graph
339 void media_graph_walk_cleanup(struct media_graph *graph)  in media_graph_walk_cleanup()  argument
341 	media_entity_enum_cleanup(&graph->ent_enum);  in media_graph_walk_cleanup()
345 void media_graph_walk_start(struct media_graph *graph,  in media_graph_walk_start()  argument
348 	media_entity_enum_zero(&graph->ent_enum);  in media_graph_walk_start()
349 	media_entity_enum_set(&graph->ent_enum, entity);  in media_graph_walk_start()
351 	graph->top = 0;  in media_graph_walk_start()
352 	graph->stack[graph->top].entity = NULL;  in media_graph_walk_start()
353 	stack_push(graph, entity);  in media_graph_walk_start()
355 		"begin graph walk at '%s'\n", entity->name);  in media_graph_walk_start()
359 static void media_graph_walk_iter(struct media_graph *graph)  in media_graph_walk_iter()  argument
361 	struct media_entity *entity = stack_top(graph);  in media_graph_walk_iter()
365 	link = list_entry(link_top(graph), typeof(*link), list);  in media_graph_walk_iter()
369 		link_top(graph) = link_top(graph)->next;  in media_graph_walk_iter()
375 		link_top(graph) = link_top(graph)->next;  in media_graph_walk_iter()
387 	if (media_entity_enum_test_and_set(&graph->ent_enum, next)) {  in media_graph_walk_iter()
388 		link_top(graph) = link_top(graph)->next;  in media_graph_walk_iter()
396 	link_top(graph) = link_top(graph)->next;  in media_graph_walk_iter()
397 	stack_push(graph, next);  in media_graph_walk_iter()
403 struct media_entity *media_graph_walk_next(struct media_graph *graph)  in media_graph_walk_next()  argument
407 	if (stack_top(graph) == NULL)  in media_graph_walk_next()
415 	while (link_top(graph) != &stack_top(graph)->links)  in media_graph_walk_next()
416 		media_graph_walk_iter(graph);  in media_graph_walk_next()
418 	entity = stack_pop(graph);  in media_graph_walk_next()
431  * The pipeline traversal stack stores pads that are reached during graph
437  * internal pad dependencies in the entity, and then links in the graph. It
726 	 * Populate the media pipeline by walking the media graph, starting  in media_pipeline_populate()
799 	 * with media_pipeline_pad instances for each pad found during graph  in __media_pipeline_start()
900 	 * Link validation on graph failed. We revert what we did and  in __media_pipeline_start()
1160 	/* Initialize graph object embedded at the new link */  in media_create_pad_link()
1164 	/* Create the backlink. Backlinks are used to help graph traversal and  in media_create_pad_link()
1178 	/* Initialize graph object embedded at the new link */  in media_create_pad_link()
1586 	/* Initialize graph object embedded at the new link */  in media_create_intf_link()
1654 	/* Initialize graph object embedded in the new link */  in media_create_ancillary_link()