mirror of https://gitee.com/openkylin/linux.git
78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
|
|
/******************************************************************************
|
|
*
|
|
* Module Name: pswalk - Parser routines to walk parsed op tree(s)
|
|
*
|
|
* Copyright (C) 2000 - 2018, Intel Corp.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#include <acpi/acpi.h>
|
|
#include "accommon.h"
|
|
#include "acparser.h"
|
|
|
|
#define _COMPONENT ACPI_PARSER
|
|
ACPI_MODULE_NAME("pswalk")
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_ps_delete_parse_tree
|
|
*
|
|
* PARAMETERS: subtree_root - Root of tree (or subtree) to delete
|
|
*
|
|
* RETURN: None
|
|
*
|
|
* DESCRIPTION: Delete a portion of or an entire parse tree.
|
|
*
|
|
******************************************************************************/
|
|
void acpi_ps_delete_parse_tree(union acpi_parse_object *subtree_root)
|
|
{
|
|
union acpi_parse_object *op = subtree_root;
|
|
union acpi_parse_object *next = NULL;
|
|
union acpi_parse_object *parent = NULL;
|
|
|
|
ACPI_FUNCTION_TRACE_PTR(ps_delete_parse_tree, subtree_root);
|
|
|
|
/* Visit all nodes in the subtree */
|
|
|
|
while (op) {
|
|
|
|
/* Check if we are not ascending */
|
|
|
|
if (op != parent) {
|
|
|
|
/* Look for an argument or child of the current op */
|
|
|
|
next = acpi_ps_get_arg(op, 0);
|
|
if (next) {
|
|
|
|
/* Still going downward in tree (Op is not completed yet) */
|
|
|
|
op = next;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* No more children, this Op is complete. */
|
|
|
|
next = op->common.next;
|
|
parent = op->common.parent;
|
|
|
|
acpi_ps_free_op(op);
|
|
|
|
/* If we are back to the starting point, the walk is complete. */
|
|
|
|
if (op == subtree_root) {
|
|
return_VOID;
|
|
}
|
|
|
|
if (next) {
|
|
op = next;
|
|
} else {
|
|
op = parent;
|
|
}
|
|
}
|
|
|
|
return_VOID;
|
|
}
|