[linux-2.6-block.git] / drivers / acpi / acpica / nswalk.c

/******************************************************************************
 *
 * Module Name: nswalk - Functions for walking the ACPI namespace
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2010, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nswalk")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_next_node
 *
 * PARAMETERS:  parent_node         - Parent node whose children we are
 *                                    getting
 *              child_node          - Previous child that was found.
 *                                    The NEXT child will be returned
 *
 * RETURN:      struct acpi_namespace_node - Pointer to the NEXT child or NULL if
 *                                    none is found.
 *
 * DESCRIPTION: Return the next peer node within the namespace.  If Handle
 *              is valid, Scope is ignored.  Otherwise, the first node
 *              within Scope is returned.
 *
 ******************************************************************************/
struct acpi_namespace_node *acpi_ns_get_next_node(struct acpi_namespace_node
						  *parent_node,
						  struct acpi_namespace_node
						  *child_node)
{
	ACPI_FUNCTION_ENTRY();

	if (!child_node) {

		/* It's really the parent's _scope_ that we want */

		return parent_node->child;
	}

	/*
	 * Get the next node.
	 *
	 * If we are at the end of this peer list, return NULL
	 */
	if (child_node->flags & ANOBJ_END_OF_PEER_LIST) {
		return NULL;
	}

	/* Otherwise just return the next peer */

	return child_node->peer;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_next_node_typed
 *
 * PARAMETERS:  Type                - Type of node to be searched for
 *              parent_node         - Parent node whose children we are
 *                                    getting
 *              child_node          - Previous child that was found.
 *                                    The NEXT child will be returned
 *
 * RETURN:      struct acpi_namespace_node - Pointer to the NEXT child or NULL if
 *                                    none is found.
 *
 * DESCRIPTION: Return the next peer node within the namespace.  If Handle
 *              is valid, Scope is ignored.  Otherwise, the first node
 *              within Scope is returned.
 *
 ******************************************************************************/

struct acpi_namespace_node *acpi_ns_get_next_node_typed(acpi_object_type type,
							struct
							acpi_namespace_node
							*parent_node,
							struct
							acpi_namespace_node
							*child_node)
{
	struct acpi_namespace_node *next_node = NULL;

	ACPI_FUNCTION_ENTRY();

	next_node = acpi_ns_get_next_node(parent_node, child_node);


	/* If any type is OK, we are done */

	if (type == ACPI_TYPE_ANY) {

		/* next_node is NULL if we are at the end-of-list */

		return (next_node);
	}

	/* Must search for the node -- but within this scope only */

	while (next_node) {

		/* If type matches, we are done */

		if (next_node->type == type) {
			return (next_node);
		}

		/* Otherwise, move on to the next node */

		next_node = acpi_ns_get_next_valid_node(next_node);
	}

	/* Not found */

	return (NULL);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_walk_namespace
 *
 * PARAMETERS:  Type                - acpi_object_type to search for
 *              start_node          - Handle in namespace where search begins
 *              max_depth           - Depth to which search is to reach
 *              Flags               - Whether to unlock the NS before invoking
 *                                    the callback routine
 *              pre_order_visit     - Called during tree pre-order visit
 *                                    when an object of "Type" is found
 *              post_order_visit    - Called during tree post-order visit
 *                                    when an object of "Type" is found
 *              Context             - Passed to user function(s) above
 *              return_value        - from the user_function if terminated
 *                                    early. Otherwise, returns NULL.
 * RETURNS:     Status
 *
 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
 *              starting (and ending) at the node specified by start_handle.
 *              The callback function is called whenever a node that matches
 *              the type parameter is found. If the callback function returns
 *              a non-zero value, the search is terminated immediately and
 *              this value is returned to the caller.
 *
 *              The point of this procedure is to provide a generic namespace
 *              walk routine that can be called from multiple places to
 *              provide multiple services; the callback function(s) can be
 *              tailored to each task, whether it is a print function,
 *              a compare function, etc.
 *
 ******************************************************************************/

acpi_status
acpi_ns_walk_namespace(acpi_object_type type,
		       acpi_handle start_node,
		       u32 max_depth,
		       u32 flags,
		       acpi_walk_callback pre_order_visit,
		       acpi_walk_callback post_order_visit,
		       void *context, void **return_value)
{
	acpi_status status;
	acpi_status mutex_status;
	struct acpi_namespace_node *child_node;
	struct acpi_namespace_node *parent_node;
	acpi_object_type child_type;
	u32 level;
	u8 node_previously_visited = FALSE;

	ACPI_FUNCTION_TRACE(ns_walk_namespace);

	/* Special case for the namespace Root Node */

	if (start_node == ACPI_ROOT_OBJECT) {
		start_node = acpi_gbl_root_node;
	}

	/* Null child means "get first node" */

	parent_node = start_node;
	child_node = acpi_ns_get_next_node(parent_node, NULL);
	child_type = ACPI_TYPE_ANY;
	level = 1;

	/*
	 * Traverse the tree of nodes until we bubble back up to where we
	 * started. When Level is zero, the loop is done because we have
	 * bubbled up to (and passed) the original parent handle (start_entry)
	 */
	while (level > 0 && child_node) {
		status = AE_OK;

		/* Found next child, get the type if we are not searching for ANY */

		if (type != ACPI_TYPE_ANY) {
			child_type = child_node->type;
		}

		/*
		 * Ignore all temporary namespace nodes (created during control
		 * method execution) unless told otherwise. These temporary nodes
		 * can cause a race condition because they can be deleted during
		 * the execution of the user function (if the namespace is
		 * unlocked before invocation of the user function.) Only the
		 * debugger namespace dump will examine the temporary nodes.
		 */
		if ((child_node->flags & ANOBJ_TEMPORARY) &&
		    !(flags & ACPI_NS_WALK_TEMP_NODES)) {
			status = AE_CTRL_DEPTH;
		}

		/* Type must match requested type */

		else if (child_type == type) {
			/*
			 * Found a matching node, invoke the user callback function.
			 * Unlock the namespace if flag is set.
			 */
			if (flags & ACPI_NS_WALK_UNLOCK) {
				mutex_status =
				    acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
				if (ACPI_FAILURE(mutex_status)) {
					return_ACPI_STATUS(mutex_status);
				}
			}

			/*
			 * Invoke the user function, either pre-order or post-order
			 * or both.
			 */
			if (!node_previously_visited) {
				if (pre_order_visit) {
					status =
					    pre_order_visit(child_node, level,
							    context,
							    return_value);
				}
			} else {
				if (post_order_visit) {
					status =
					    post_order_visit(child_node, level,
							     context,
							     return_value);
				}
			}

			if (flags & ACPI_NS_WALK_UNLOCK) {
				mutex_status =
				    acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
				if (ACPI_FAILURE(mutex_status)) {
					return_ACPI_STATUS(mutex_status);
				}
			}

			switch (status) {
			case AE_OK:
			case AE_CTRL_DEPTH:

				/* Just keep going */
				break;

			case AE_CTRL_TERMINATE:

				/* Exit now, with OK status */

				return_ACPI_STATUS(AE_OK);

			default:

				/* All others are valid exceptions */

				return_ACPI_STATUS(status);
			}
		}

		/*
		 * Depth first search: Attempt to go down another level in the
		 * namespace if we are allowed to.  Don't go any further if we have
		 * reached the caller specified maximum depth or if the user
		 * function has specified that the maximum depth has been reached.
		 */
		if (!node_previously_visited &&
		    (level < max_depth) && (status != AE_CTRL_DEPTH)) {
			if (child_node->child) {

				/* There is at least one child of this node, visit it */

				level++;
				parent_node = child_node;
				child_node =
				    acpi_ns_get_next_node(parent_node, NULL);
				continue;
			}
		}

		/* No more children, re-visit this node */

		if (!node_previously_visited) {
			node_previously_visited = TRUE;
			continue;
		}

		/* No more children, visit peers */

		child_node = acpi_ns_get_next_node(parent_node, child_node);
		if (child_node) {
			node_previously_visited = FALSE;
		}

		/* No peers, re-visit parent */

		else {
			/*
			 * No more children of this node (acpi_ns_get_next_node failed), go
			 * back upwards in the namespace tree to the node's parent.
			 */
			level--;
			child_node = parent_node;
			parent_node = acpi_ns_get_parent_node(parent_node);

			node_previously_visited = TRUE;
		}
	}

	/* Complete walk, not terminated by user function */

	return_ACPI_STATUS(AE_OK);
}
Commit	Line	Data
1da177e4 LT	1	/******************************************************************************
	2	*
	3	* Module Name: nswalk - Functions for walking the ACPI namespace
	4	*
	5	*****************************************************************************/
	6
	7	/*
a8357b0c	8	* Copyright (C) 2000 - 2010, Intel Corp.
1da177e4 LT	9	* All rights reserved.
	10	*
	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions, and the following disclaimer,
	16	* without modification.
	17	* 2. Redistributions in binary form must reproduce at minimum a disclaimer
	18	* substantially similar to the "NO WARRANTY" disclaimer below
	19	* ("Disclaimer") and any redistribution must be conditioned upon
	20	* including a substantially similar Disclaimer requirement for further
	21	* binary redistribution.
	22	* 3. Neither the names of the above-listed copyright holders nor the names
	23	* of any contributors may be used to endorse or promote products derived
	24	* from this software without specific prior written permission.
	25	*
	26	* Alternatively, this software may be distributed under the terms of the
	27	* GNU General Public License ("GPL") version 2 as published by the Free
	28	* Software Foundation.
	29	*
	30	* NO WARRANTY
	31	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	32	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	33	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
	34	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	35	* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	36	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	37	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	38	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	39	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
	40	* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	41	* POSSIBILITY OF SUCH DAMAGES.
	42	*/
	43
1da177e4	44	#include <acpi/acpi.h>
e2f7a777 LB	45	#include "accommon.h"
e2f7a777 LB	46	#include "acnamesp.h"
1da177e4	47
1da177e4	48	#define _COMPONENT ACPI_NAMESPACE
4be44fcd	49	ACPI_MODULE_NAME("nswalk")
1da177e4 LT	50
	51	/*******************************************************************************
	52	*
	53	* FUNCTION: acpi_ns_get_next_node
	54	*
8c725bf9	55	* PARAMETERS: parent_node - Parent node whose children we are
44f6c012	56	* getting
1da177e4 LT	57	* child_node - Previous child that was found.
	58	* The NEXT child will be returned
	59	*
	60	* RETURN: struct acpi_namespace_node - Pointer to the NEXT child or NULL if
	61	* none is found.
	62	*
	63	* DESCRIPTION: Return the next peer node within the namespace. If Handle
	64	* is valid, Scope is ignored. Otherwise, the first node
	65	* within Scope is returned.
	66	*
	67	******************************************************************************/
8c725bf9 BM	68	struct acpi_namespace_node *acpi_ns_get_next_node(struct acpi_namespace_node
	69	*parent_node,
	70	struct acpi_namespace_node
4be44fcd	71	*child_node)
1da177e4	72	{
4be44fcd	73	ACPI_FUNCTION_ENTRY();
1da177e4 LT	74
1da177e4 LT	75	if (!child_node) {
52fc0b02	76
1da177e4 LT	77	/* It's really the parent's _scope_ that we want */
1da177e4 LT	78
8c725bf9	79	return parent_node->child;
1da177e4 LT	80	}
1da177e4 LT	81
8c725bf9 BM	82	/*
	83	* Get the next node.
	84	*
	85	* If we are at the end of this peer list, return NULL
	86	*/
	87	if (child_node->flags & ANOBJ_END_OF_PEER_LIST) {
	88	return NULL;
1da177e4 LT	89	}
1da177e4 LT	90
8c725bf9 BM	91	/* Otherwise just return the next peer */
	92
	93	return child_node->peer;
	94	}
	95
	96	/*******************************************************************************
	97	*
	98	* FUNCTION: acpi_ns_get_next_node_typed
	99	*
	100	* PARAMETERS: Type - Type of node to be searched for
	101	* parent_node - Parent node whose children we are
	102	* getting
	103	* child_node - Previous child that was found.
	104	* The NEXT child will be returned
	105	*
	106	* RETURN: struct acpi_namespace_node - Pointer to the NEXT child or NULL if
	107	* none is found.
	108	*
	109	* DESCRIPTION: Return the next peer node within the namespace. If Handle
	110	* is valid, Scope is ignored. Otherwise, the first node
	111	* within Scope is returned.
	112	*
	113	******************************************************************************/
	114
	115	struct acpi_namespace_node *acpi_ns_get_next_node_typed(acpi_object_type type,
	116	struct
	117	acpi_namespace_node
	118	*parent_node,
	119	struct
	120	acpi_namespace_node
	121	*child_node)
	122	{
	123	struct acpi_namespace_node *next_node = NULL;
	124
	125	ACPI_FUNCTION_ENTRY();
	126
	127	next_node = acpi_ns_get_next_node(parent_node, child_node);
	128
	129
1da177e4 LT	130	/* If any type is OK, we are done */
	131
	132	if (type == ACPI_TYPE_ANY) {
52fc0b02	133
1da177e4 LT	134	/* next_node is NULL if we are at the end-of-list */
	135
	136	return (next_node);
	137	}
	138
	139	/* Must search for the node -- but within this scope only */
	140
	141	while (next_node) {
52fc0b02	142
1da177e4 LT	143	/* If type matches, we are done */
	144
	145	if (next_node->type == type) {
	146	return (next_node);
	147	}
	148
	149	/* Otherwise, move on to the next node */
	150
4be44fcd	151	next_node = acpi_ns_get_next_valid_node(next_node);
1da177e4 LT	152	}
	153
	154	/* Not found */
	155
	156	return (NULL);
	157	}
	158
1da177e4 LT	159	/*******************************************************************************
	160	*
	161	* FUNCTION: acpi_ns_walk_namespace
	162	*
	163	* PARAMETERS: Type - acpi_object_type to search for
	164	* start_node - Handle in namespace where search begins
	165	* max_depth - Depth to which search is to reach
d1fdda83	166	* Flags - Whether to unlock the NS before invoking
1da177e4	167	* the callback routine
2263576c LM	168	* pre_order_visit - Called during tree pre-order visit
	169	* when an object of "Type" is found
	170	* post_order_visit - Called during tree post-order visit
	171	* when an object of "Type" is found
	172	* Context - Passed to user function(s) above
	173	* return_value - from the user_function if terminated
	174	* early. Otherwise, returns NULL.
1da177e4 LT	175	* RETURNS: Status
	176	*
	177	* DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
	178	* starting (and ending) at the node specified by start_handle.
2263576c LM	179	* The callback function is called whenever a node that matches
2263576c LM	180	* the type parameter is found. If the callback function returns
d4913dc6 BM	181	* a non-zero value, the search is terminated immediately and
d4913dc6 BM	182	* this value is returned to the caller.
1da177e4 LT	183	*
	184	* The point of this procedure is to provide a generic namespace
	185	* walk routine that can be called from multiple places to
2263576c LM	186	* provide multiple services; the callback function(s) can be
	187	* tailored to each task, whether it is a print function,
	188	* a compare function, etc.
1da177e4 LT	189	*
	190	******************************************************************************/
	191
	192	acpi_status
4be44fcd LB	193	acpi_ns_walk_namespace(acpi_object_type type,
	194	acpi_handle start_node,
	195	u32 max_depth,
d1fdda83	196	u32 flags,
2263576c LM	197	acpi_walk_callback pre_order_visit,
2263576c LM	198	acpi_walk_callback post_order_visit,
4be44fcd	199	void context, void *return_value)
1da177e4	200	{
4be44fcd LB	201	acpi_status status;
	202	acpi_status mutex_status;
	203	struct acpi_namespace_node *child_node;
	204	struct acpi_namespace_node *parent_node;
	205	acpi_object_type child_type;
	206	u32 level;
2263576c	207	u8 node_previously_visited = FALSE;
1da177e4	208
b229cf92	209	ACPI_FUNCTION_TRACE(ns_walk_namespace);
1da177e4 LT	210
	211	/* Special case for the namespace Root Node */
	212
	213	if (start_node == ACPI_ROOT_OBJECT) {
	214	start_node = acpi_gbl_root_node;
	215	}
	216
	217	/* Null child means "get first node" */
	218
	219	parent_node = start_node;
2263576c	220	child_node = acpi_ns_get_next_node(parent_node, NULL);
4be44fcd LB	221	child_type = ACPI_TYPE_ANY;
4be44fcd LB	222	level = 1;
1da177e4 LT	223
	224	/*
	225	* Traverse the tree of nodes until we bubble back up to where we
	226	* started. When Level is zero, the loop is done because we have
	227	* bubbled up to (and passed) the original parent handle (start_entry)
	228	*/
2263576c LM	229	while (level > 0 && child_node) {
2263576c LM	230	status = AE_OK;
52fc0b02	231
2263576c	232	/* Found next child, get the type if we are not searching for ANY */
1da177e4	233
2263576c LM	234	if (type != ACPI_TYPE_ANY) {
	235	child_type = child_node->type;
	236	}
3effba32	237
2263576c LM	238	/*
	239	* Ignore all temporary namespace nodes (created during control
	240	* method execution) unless told otherwise. These temporary nodes
	241	* can cause a race condition because they can be deleted during
	242	* the execution of the user function (if the namespace is
	243	* unlocked before invocation of the user function.) Only the
	244	* debugger namespace dump will examine the temporary nodes.
	245	*/
	246	if ((child_node->flags & ANOBJ_TEMPORARY) &&
	247	!(flags & ACPI_NS_WALK_TEMP_NODES)) {
	248	status = AE_CTRL_DEPTH;
	249	}
3effba32	250
2263576c	251	/* Type must match requested type */
1da177e4	252
2263576c	253	else if (child_type == type) {
3effba32	254	/*
2263576c LM	255	* Found a matching node, invoke the user callback function.
2263576c LM	256	* Unlock the namespace if flag is set.
3effba32	257	*/
2263576c LM	258	if (flags & ACPI_NS_WALK_UNLOCK) {
	259	mutex_status =
	260	acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	261	if (ACPI_FAILURE(mutex_status)) {
	262	return_ACPI_STATUS(mutex_status);
	263	}
c1014629 BM	264	}
c1014629 BM	265
2263576c LM	266	/*
	267	* Invoke the user function, either pre-order or post-order
	268	* or both.
	269	*/
	270	if (!node_previously_visited) {
	271	if (pre_order_visit) {
	272	status =
	273	pre_order_visit(child_node, level,
	274	context,
	275	return_value);
1da177e4	276	}
2263576c LM	277	} else {
	278	if (post_order_visit) {
	279	status =
	280	post_order_visit(child_node, level,
	281	context,
	282	return_value);
	283	}
	284	}
1da177e4	285
2263576c LM	286	if (flags & ACPI_NS_WALK_UNLOCK) {
	287	mutex_status =
	288	acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	289	if (ACPI_FAILURE(mutex_status)) {
	290	return_ACPI_STATUS(mutex_status);
1da177e4	291	}
2263576c	292	}
1da177e4	293
2263576c LM	294	switch (status) {
	295	case AE_OK:
	296	case AE_CTRL_DEPTH:
1da177e4	297
2263576c LM	298	/* Just keep going */
2263576c LM	299	break;
1da177e4	300
2263576c	301	case AE_CTRL_TERMINATE:
1da177e4	302
2263576c	303	/* Exit now, with OK status */
1da177e4	304
2263576c	305	return_ACPI_STATUS(AE_OK);
1da177e4	306
2263576c	307	default:
1da177e4	308
2263576c	309	/* All others are valid exceptions */
1da177e4	310
2263576c LM	311	return_ACPI_STATUS(status);
	312	}
	313	}
	314
	315	/*
	316	* Depth first search: Attempt to go down another level in the
	317	* namespace if we are allowed to. Don't go any further if we have
	318	* reached the caller specified maximum depth or if the user
	319	* function has specified that the maximum depth has been reached.
	320	*/
	321	if (!node_previously_visited &&
	322	(level < max_depth) && (status != AE_CTRL_DEPTH)) {
	323	if (child_node->child) {
	324
	325	/* There is at least one child of this node, visit it */
	326
	327	level++;
	328	parent_node = child_node;
	329	child_node =
	330	acpi_ns_get_next_node(parent_node, NULL);
	331	continue;
1da177e4	332	}
2263576c	333	}
1da177e4	334
2263576c	335	/* No more children, re-visit this node */
3effba32	336
2263576c LM	337	if (!node_previously_visited) {
	338	node_previously_visited = TRUE;
	339	continue;
	340	}
3effba32	341
2263576c LM	342	/* No more children, visit peers */
	343
	344	child_node = acpi_ns_get_next_node(parent_node, child_node);
	345	if (child_node) {
	346	node_previously_visited = FALSE;
	347	}
	348
	349	/* No peers, re-visit parent */
	350
	351	else {
1da177e4	352	/*
3effba32 BM	353	* No more children of this node (acpi_ns_get_next_node failed), go
3effba32 BM	354	* back upwards in the namespace tree to the node's parent.
1da177e4 LT	355	*/
	356	level--;
	357	child_node = parent_node;
4be44fcd	358	parent_node = acpi_ns_get_parent_node(parent_node);
2263576c LM	359
2263576c LM	360	node_previously_visited = TRUE;
1da177e4 LT	361	}
	362	}
	363
	364	/* Complete walk, not terminated by user function */
	365
4be44fcd	366	return_ACPI_STATUS(AE_OK);
1da177e4	367	}