of: of_free fixes

- Add missing prototype for of_free()
- When root node is freed set root_node to NULL
- (re)scan aliases after freeing a node. This is necessary because
  the freed node may be an alias or point to an alias

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

drivers/of/base.c

@@ -138,6 +138,12 @@ static void of_alias_add(struct alias_prop *ap, struct device_node *np,
 void of_alias_scan(void)
 {
 	struct property *pp;
+	struct alias_prop *app, *tmp;
+
+	list_for_each_entry_safe(app, tmp, &aliases_lookup, link)
+		free(app);
+
+	INIT_LIST_HEAD(&aliases_lookup);
 
 	of_aliases = of_find_node_by_path("/aliases");
 	if (!of_aliases)
@@ -777,6 +783,11 @@ void of_free(struct device_node *node)
 	free(node->name);
 	free(node->full_name);
 	free(node);
+
+	if (node == root_node)
+		root_node = NULL;
+
+	of_alias_scan();
 }
 
 static void __of_probe(struct device_node *node)

include/of.h

@@ -107,6 +107,7 @@ int of_machine_is_compatible(const char *compat);
 void of_print_nodes(struct device_node *node, int indent);
 int of_probe(void);
 int of_parse_dtb(struct fdt_header *fdt);
+void of_free(struct device_node *node);
 
 int of_property_read_string(struct device_node *np, const char *propname,
 				const char **out_string);