ACPICA: Add support to delete all objects attached to the root namesp…

…ace node.

This fix deletes any and all objects that have been attached to the
root node (via acpi_attach_data). Reported by Tomasz Nowicki.
ACPICA BZ 1026.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/nsalloc.c

@@ -134,6 +134,12 @@ void acpi_ns_delete_node(struct acpi_namespace_node *node)
 		obj_desc = next_desc;
 	}
 
+	/* Special case for the statically allocated root node */
+
+	if (node == acpi_gbl_root_node) {
+		return;
+	}
+
 	/* Now we can delete the node */
 
 	(void)acpi_os_release_object(acpi_gbl_namespace_cache, node);

drivers/acpi/acpica/nsutils.c

@@ -593,24 +593,26 @@ struct acpi_namespace_node *acpi_ns_validate_handle(acpi_handle handle)
 
 void acpi_ns_terminate(void)
 {
-	union acpi_operand_object *obj_desc;
+	acpi_status status;
 
 	ACPI_FUNCTION_TRACE(ns_terminate);
 
 	/*
-	 * 1) Free the entire namespace -- all nodes and objects
-	 *
-	 * Delete all object descriptors attached to namepsace nodes
+	 * Free the entire namespace -- all nodes and all objects
+	 * attached to the nodes
 	 */
 	acpi_ns_delete_namespace_subtree(acpi_gbl_root_node);
 
-	/* Detach any objects attached to the root */
+	/* Delete any objects attached to the root node */
 
-	obj_desc = acpi_ns_get_attached_object(acpi_gbl_root_node);
-	if (obj_desc) {
-		acpi_ns_detach_object(acpi_gbl_root_node);
+	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
+	if (ACPI_FAILURE(status)) {
+		return_VOID;
 	}
 
+	acpi_ns_delete_node(acpi_gbl_root_node);
+	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
+
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n"));
 	return_VOID;
 }