237  * Graph traversal
250 static void stack_push(struct media_graph *graph,  in stack_push()  argument
253 	if (graph->top == MEDIA_ENTITY_ENUM_MAX_DEPTH - 1) {  in stack_push()
257 	graph->top++;  in stack_push()
258 	graph->stack[graph->top].link = entity->links.next;  in stack_push()
259 	graph->stack[graph->top].entity = entity;  in stack_push()
262 static struct media_entity *stack_pop(struct media_graph *graph)  in stack_pop()  argument
266 	entity = graph->stack[graph->top].entity;  in stack_pop()
267 	graph->top--;  in stack_pop()
276  * media_graph_walk_init - Allocate resources for graph walk
277  * @graph: Media graph structure that will be used to walk the graph
280  * Reserve resources for graph walk in media device's current
287 	struct media_graph *graph, struct media_device *mdev)  in media_graph_walk_init()  argument
289 	return media_entity_enum_init(&graph->ent_enum, mdev);  in media_graph_walk_init()
294  * media_graph_walk_cleanup - Release resources related to graph walking
295  * @graph: Media graph structure that was used to walk the graph
297 void media_graph_walk_cleanup(struct media_graph *graph)  in media_graph_walk_cleanup()  argument
299 	media_entity_enum_cleanup(&graph->ent_enum);  in media_graph_walk_cleanup()
303 void media_graph_walk_start(struct media_graph *graph,  in media_graph_walk_start()  argument
306 	media_entity_enum_zero(&graph->ent_enum);  in media_graph_walk_start()
307 	media_entity_enum_set(&graph->ent_enum, entity);  in media_graph_walk_start()
309 	graph->top = 0;  in media_graph_walk_start()
310 	graph->stack[graph->top].entity = NULL;  in media_graph_walk_start()
311 	stack_push(graph, entity);  in media_graph_walk_start()
313 		"begin graph walk at '%s'\n", entity->name);  in media_graph_walk_start()
317 static void media_graph_walk_iter(struct media_graph *graph)  in media_graph_walk_iter()  argument
319 	struct media_entity *entity = stack_top(graph);  in media_graph_walk_iter()
323 	link = list_entry(link_top(graph), typeof(*link), list);  in media_graph_walk_iter()
327 		link_top(graph) = link_top(graph)->next;  in media_graph_walk_iter()
339 	if (media_entity_enum_test_and_set(&graph->ent_enum, next)) {  in media_graph_walk_iter()
340 		link_top(graph) = link_top(graph)->next;  in media_graph_walk_iter()
348 	link_top(graph) = link_top(graph)->next;  in media_graph_walk_iter()
349 	stack_push(graph, next);  in media_graph_walk_iter()
354 struct media_entity *media_graph_walk_next(struct media_graph *graph)  in media_graph_walk_next()  argument
358 	if (stack_top(graph) == NULL)  in media_graph_walk_next()
366 	while (link_top(graph) != &stack_top(graph)->links)  in media_graph_walk_next()
367 		media_graph_walk_iter(graph);  in media_graph_walk_next()
369 	entity = stack_pop(graph);  in media_graph_walk_next()
420 	struct media_graph *graph = &pipe->graph;  in __media_pipeline_start()  local
426 		ret = media_graph_walk_init(&pipe->graph, mdev);  in __media_pipeline_start()
431 	media_graph_walk_start(&pipe->graph, entity);  in __media_pipeline_start()
433 	while ((entity = media_graph_walk_next(graph))) {  in __media_pipeline_start()
509 	 * Link validation on graph failed. We revert what we did and  in __media_pipeline_start()
512 	media_graph_walk_start(graph, entity_err);  in __media_pipeline_start()
514 	while ((entity_err = media_graph_walk_next(graph))) {  in __media_pipeline_start()
532 		media_graph_walk_cleanup(graph);  in __media_pipeline_start()
553 	struct media_graph *graph = &entity->pipe->graph;  in __media_pipeline_stop()  local
563 	media_graph_walk_start(graph, entity);  in __media_pipeline_stop()
565 	while ((entity = media_graph_walk_next(graph))) {  in __media_pipeline_stop()
575 		media_graph_walk_cleanup(graph);  in __media_pipeline_stop()
684 	/* Initialize graph object embedded at the new link */  in media_create_pad_link()
688 	/* Create the backlink. Backlinks are used to help graph traversal and  in media_create_pad_link()
702 	/* Initialize graph object embedded at the new link */  in media_create_pad_link()
983 	/* Initialize graph object embedded at the new link */  in media_create_intf_link()