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nsutils.c

/******************************************************************************
 *
 * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
 *                        parents and siblings and Scope manipulation
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2007, R. Byron Moore
 * 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 <acpi/acnamesp.h>
#include <acpi/amlcode.h>
#include <acpi/actables.h>

#define _COMPONENT          ACPI_NAMESPACE
ACPI_MODULE_NAME("nsutils")

/* Local prototypes */
static u8 acpi_ns_valid_path_separator(char sep);

#ifdef ACPI_OBSOLETE_FUNCTIONS
acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node *node_to_search);
#endif

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_report_error
 *
 * PARAMETERS:  module_name         - Caller's module name (for error output)
 *              line_number         - Caller's line number (for error output)
 *              internal_name       - Name or path of the namespace node
 *              lookup_status       - Exception code from NS lookup
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print warning message with full pathname
 *
 ******************************************************************************/

void
acpi_ns_report_error(char *module_name,
                 u32 line_number,
                 char *internal_name, acpi_status lookup_status)
{
      acpi_status status;
      u32 bad_name;
      char *name = NULL;

      acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);

      if (lookup_status == AE_BAD_CHARACTER) {

            /* There is a non-ascii character in the name */

            ACPI_MOVE_32_TO_32(&bad_name, internal_name);
            acpi_os_printf("[0x%4.4X] (NON-ASCII)", bad_name);
      } else {
            /* Convert path to external format */

            status = acpi_ns_externalize_name(ACPI_UINT32_MAX,
                                      internal_name, NULL, &name);

            /* Print target name */

            if (ACPI_SUCCESS(status)) {
                  acpi_os_printf("[%s]", name);
            } else {
                  acpi_os_printf("[COULD NOT EXTERNALIZE NAME]");
            }

            if (name) {
                  ACPI_FREE(name);
            }
      }

      acpi_os_printf(" Namespace lookup failure, %s\n",
                   acpi_format_exception(lookup_status));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_report_method_error
 *
 * PARAMETERS:  module_name         - Caller's module name (for error output)
 *              line_number         - Caller's line number (for error output)
 *              Message             - Error message to use on failure
 *              prefix_node         - Prefix relative to the path
 *              Path                - Path to the node (optional)
 *              method_status       - Execution status
 *
 * RETURN:      None
 *
 * DESCRIPTION: Print warning message with full pathname
 *
 ******************************************************************************/

void
acpi_ns_report_method_error(char *module_name,
                      u32 line_number,
                      char *message,
                      struct acpi_namespace_node *prefix_node,
                      char *path, acpi_status method_status)
{
      acpi_status status;
      struct acpi_namespace_node *node = prefix_node;

      acpi_os_printf("ACPI Error (%s-%04d): ", module_name, line_number);

      if (path) {
            status =
                acpi_ns_get_node(prefix_node, path, ACPI_NS_NO_UPSEARCH,
                             &node);
            if (ACPI_FAILURE(status)) {
                  acpi_os_printf("[Could not get node by pathname]");
            }
      }

      acpi_ns_print_node_pathname(node, message);
      acpi_os_printf(", %s\n", acpi_format_exception(method_status));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_print_node_pathname
 *
 * PARAMETERS:  Node            - Object
 *              Message         - Prefix message
 *
 * DESCRIPTION: Print an object's full namespace pathname
 *              Manages allocation/freeing of a pathname buffer
 *
 ******************************************************************************/

void
acpi_ns_print_node_pathname(struct acpi_namespace_node *node, char *message)
{
      struct acpi_buffer buffer;
      acpi_status status;

      if (!node) {
            acpi_os_printf("[NULL NAME]");
            return;
      }

      /* Convert handle to full pathname and print it (with supplied message) */

      buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;

      status = acpi_ns_handle_to_pathname(node, &buffer);
      if (ACPI_SUCCESS(status)) {
            if (message) {
                  acpi_os_printf("%s ", message);
            }

            acpi_os_printf("[%s] (Node %p)", (char *)buffer.pointer, node);
            ACPI_FREE(buffer.pointer);
      }
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_valid_root_prefix
 *
 * PARAMETERS:  Prefix          - Character to be checked
 *
 * RETURN:      TRUE if a valid prefix
 *
 * DESCRIPTION: Check if a character is a valid ACPI Root prefix
 *
 ******************************************************************************/

u8 acpi_ns_valid_root_prefix(char prefix)
{

      return ((u8) (prefix == '\\'));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_valid_path_separator
 *
 * PARAMETERS:  Sep         - Character to be checked
 *
 * RETURN:      TRUE if a valid path separator
 *
 * DESCRIPTION: Check if a character is a valid ACPI path separator
 *
 ******************************************************************************/

static u8 acpi_ns_valid_path_separator(char sep)
{

      return ((u8) (sep == '.'));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_type
 *
 * PARAMETERS:  Node        - Parent Node to be examined
 *
 * RETURN:      Type field from Node whose handle is passed
 *
 * DESCRIPTION: Return the type of a Namespace node
 *
 ******************************************************************************/

acpi_object_type acpi_ns_get_type(struct acpi_namespace_node * node)
{
      ACPI_FUNCTION_TRACE(ns_get_type);

      if (!node) {
            ACPI_WARNING((AE_INFO, "Null Node parameter"));
            return_UINT32(ACPI_TYPE_ANY);
      }

      return_UINT32((acpi_object_type) node->type);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_local
 *
 * PARAMETERS:  Type        - A namespace object type
 *
 * RETURN:      LOCAL if names must be found locally in objects of the
 *              passed type, 0 if enclosing scopes should be searched
 *
 * DESCRIPTION: Returns scope rule for the given object type.
 *
 ******************************************************************************/

u32 acpi_ns_local(acpi_object_type type)
{
      ACPI_FUNCTION_TRACE(ns_local);

      if (!acpi_ut_valid_object_type(type)) {

            /* Type code out of range  */

            ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
            return_UINT32(ACPI_NS_NORMAL);
      }

      return_UINT32((u32) acpi_gbl_ns_properties[type] & ACPI_NS_LOCAL);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_internal_name_length
 *
 * PARAMETERS:  Info            - Info struct initialized with the
 *                                external name pointer.
 *
 * RETURN:      None
 *
 * DESCRIPTION: Calculate the length of the internal (AML) namestring
 *              corresponding to the external (ASL) namestring.
 *
 ******************************************************************************/

void acpi_ns_get_internal_name_length(struct acpi_namestring_info *info)
{
      char *next_external_char;
      u32 i;

      ACPI_FUNCTION_ENTRY();

      next_external_char = info->external_name;
      info->num_carats = 0;
      info->num_segments = 0;
      info->fully_qualified = FALSE;

      /*
       * For the internal name, the required length is 4 bytes per segment, plus
       * 1 each for root_prefix, multi_name_prefix_op, segment count, trailing null
       * (which is not really needed, but no there's harm in putting it there)
       *
       * strlen() + 1 covers the first name_seg, which has no path separator
       */
      if (acpi_ns_valid_root_prefix(next_external_char[0])) {
            info->fully_qualified = TRUE;
            next_external_char++;
      } else {
            /*
             * Handle Carat prefixes
             */
            while (*next_external_char == '^') {
                  info->num_carats++;
                  next_external_char++;
            }
      }

      /*
       * Determine the number of ACPI name "segments" by counting the number of
       * path separators within the string. Start with one segment since the
       * segment count is [(# separators) + 1], and zero separators is ok.
       */
      if (*next_external_char) {
            info->num_segments = 1;
            for (i = 0; next_external_char[i]; i++) {
                  if (acpi_ns_valid_path_separator(next_external_char[i])) {
                        info->num_segments++;
                  }
            }
      }

      info->length = (ACPI_NAME_SIZE * info->num_segments) +
          4 + info->num_carats;

      info->next_external_char = next_external_char;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_build_internal_name
 *
 * PARAMETERS:  Info            - Info struct fully initialized
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Construct the internal (AML) namestring
 *              corresponding to the external (ASL) namestring.
 *
 ******************************************************************************/

acpi_status acpi_ns_build_internal_name(struct acpi_namestring_info *info)
{
      u32 num_segments = info->num_segments;
      char *internal_name = info->internal_name;
      char *external_name = info->next_external_char;
      char *result = NULL;
      acpi_native_uint i;

      ACPI_FUNCTION_TRACE(ns_build_internal_name);

      /* Setup the correct prefixes, counts, and pointers */

      if (info->fully_qualified) {
            internal_name[0] = '\\';

            if (num_segments <= 1) {
                  result = &internal_name[1];
            } else if (num_segments == 2) {
                  internal_name[1] = AML_DUAL_NAME_PREFIX;
                  result = &internal_name[2];
            } else {
                  internal_name[1] = AML_MULTI_NAME_PREFIX_OP;
                  internal_name[2] = (char)num_segments;
                  result = &internal_name[3];
            }
      } else {
            /*
             * Not fully qualified.
             * Handle Carats first, then append the name segments
             */
            i = 0;
            if (info->num_carats) {
                  for (i = 0; i < info->num_carats; i++) {
                        internal_name[i] = '^';
                  }
            }

            if (num_segments <= 1) {
                  result = &internal_name[i];
            } else if (num_segments == 2) {
                  internal_name[i] = AML_DUAL_NAME_PREFIX;
                  result = &internal_name[(acpi_native_uint) (i + 1)];
            } else {
                  internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
                  internal_name[(acpi_native_uint) (i + 1)] =
                      (char)num_segments;
                  result = &internal_name[(acpi_native_uint) (i + 2)];
            }
      }

      /* Build the name (minus path separators) */

      for (; num_segments; num_segments--) {
            for (i = 0; i < ACPI_NAME_SIZE; i++) {
                  if (acpi_ns_valid_path_separator(*external_name) ||
                      (*external_name == 0)) {

                        /* Pad the segment with underscore(s) if segment is short */

                        result[i] = '_';
                  } else {
                        /* Convert the character to uppercase and save it */

                        result[i] =
                            (char)ACPI_TOUPPER((int)*external_name);
                        external_name++;
                  }
            }

            /* Now we must have a path separator, or the pathname is bad */

            if (!acpi_ns_valid_path_separator(*external_name) &&
                (*external_name != 0)) {
                  return_ACPI_STATUS(AE_BAD_PARAMETER);
            }

            /* Move on the next segment */

            external_name++;
            result += ACPI_NAME_SIZE;
      }

      /* Terminate the string */

      *result = 0;

      if (info->fully_qualified) {
            ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                          "Returning [%p] (abs) \"\\%s\"\n",
                          internal_name, internal_name));
      } else {
            ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Returning [%p] (rel) \"%s\"\n",
                          internal_name, internal_name));
      }

      return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_internalize_name
 *
 * PARAMETERS:  *external_name          - External representation of name
 *              **Converted Name        - Where to return the resulting
 *                                        internal represention of the name
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert an external representation (e.g. "\_PR_.CPU0")
 *              to internal form (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
 *
 *******************************************************************************/

acpi_status acpi_ns_internalize_name(char *external_name, char **converted_name)
{
      char *internal_name;
      struct acpi_namestring_info info;
      acpi_status status;

      ACPI_FUNCTION_TRACE(ns_internalize_name);

      if ((!external_name) || (*external_name == 0) || (!converted_name)) {
            return_ACPI_STATUS(AE_BAD_PARAMETER);
      }

      /* Get the length of the new internal name */

      info.external_name = external_name;
      acpi_ns_get_internal_name_length(&info);

      /* We need a segment to store the internal  name */

      internal_name = ACPI_ALLOCATE_ZEROED(info.length);
      if (!internal_name) {
            return_ACPI_STATUS(AE_NO_MEMORY);
      }

      /* Build the name */

      info.internal_name = internal_name;
      status = acpi_ns_build_internal_name(&info);
      if (ACPI_FAILURE(status)) {
            ACPI_FREE(internal_name);
            return_ACPI_STATUS(status);
      }

      *converted_name = internal_name;
      return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_externalize_name
 *
 * PARAMETERS:  internal_name_length - Lenth of the internal name below
 *              internal_name       - Internal representation of name
 *              converted_name_length - Where the length is returned
 *              converted_name      - Where the resulting external name
 *                                    is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Convert internal name (e.g. 5c 2f 02 5f 50 52 5f 43 50 55 30)
 *              to its external (printable) form (e.g. "\_PR_.CPU0")
 *
 ******************************************************************************/

acpi_status
acpi_ns_externalize_name(u32 internal_name_length,
                   char *internal_name,
                   u32 * converted_name_length, char **converted_name)
{
      acpi_native_uint names_index = 0;
      acpi_native_uint num_segments = 0;
      acpi_native_uint required_length;
      acpi_native_uint prefix_length = 0;
      acpi_native_uint i = 0;
      acpi_native_uint j = 0;

      ACPI_FUNCTION_TRACE(ns_externalize_name);

      if (!internal_name_length || !internal_name || !converted_name) {
            return_ACPI_STATUS(AE_BAD_PARAMETER);
      }

      /*
       * Check for a prefix (one '\' | one or more '^').
       */
      switch (internal_name[0]) {
      case '\\':
            prefix_length = 1;
            break;

      case '^':
            for (i = 0; i < internal_name_length; i++) {
                  if (internal_name[i] == '^') {
                        prefix_length = i + 1;
                  } else {
                        break;
                  }
            }

            if (i == internal_name_length) {
                  prefix_length = i;
            }

            break;

      default:
            break;
      }

      /*
       * Check for object names.  Note that there could be 0-255 of these
       * 4-byte elements.
       */
      if (prefix_length < internal_name_length) {
            switch (internal_name[prefix_length]) {
            case AML_MULTI_NAME_PREFIX_OP:

                  /* <count> 4-byte names */

                  names_index = prefix_length + 2;
                  num_segments = (acpi_native_uint) (u8)
                      internal_name[(acpi_native_uint)
                                (prefix_length + 1)];
                  break;

            case AML_DUAL_NAME_PREFIX:

                  /* Two 4-byte names */

                  names_index = prefix_length + 1;
                  num_segments = 2;
                  break;

            case 0:

                  /* null_name */

                  names_index = 0;
                  num_segments = 0;
                  break;

            default:

                  /* one 4-byte name */

                  names_index = prefix_length;
                  num_segments = 1;
                  break;
            }
      }

      /*
       * Calculate the length of converted_name, which equals the length
       * of the prefix, length of all object names, length of any required
       * punctuation ('.') between object names, plus the NULL terminator.
       */
      required_length = prefix_length + (4 * num_segments) +
          ((num_segments > 0) ? (num_segments - 1) : 0) + 1;

      /*
       * Check to see if we're still in bounds.  If not, there's a problem
       * with internal_name (invalid format).
       */
      if (required_length > internal_name_length) {
            ACPI_ERROR((AE_INFO, "Invalid internal name"));
            return_ACPI_STATUS(AE_BAD_PATHNAME);
      }

      /*
       * Build converted_name
       */
      *converted_name = ACPI_ALLOCATE_ZEROED(required_length);
      if (!(*converted_name)) {
            return_ACPI_STATUS(AE_NO_MEMORY);
      }

      j = 0;

      for (i = 0; i < prefix_length; i++) {
            (*converted_name)[j++] = internal_name[i];
      }

      if (num_segments > 0) {
            for (i = 0; i < num_segments; i++) {
                  if (i > 0) {
                        (*converted_name)[j++] = '.';
                  }

                  (*converted_name)[j++] = internal_name[names_index++];
                  (*converted_name)[j++] = internal_name[names_index++];
                  (*converted_name)[j++] = internal_name[names_index++];
                  (*converted_name)[j++] = internal_name[names_index++];
            }
      }

      if (converted_name_length) {
            *converted_name_length = (u32) required_length;
      }

      return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_map_handle_to_node
 *
 * PARAMETERS:  Handle          - Handle to be converted to an Node
 *
 * RETURN:      A Name table entry pointer
 *
 * DESCRIPTION: Convert a namespace handle to a real Node
 *
 * Note: Real integer handles would allow for more verification
 *       and keep all pointers within this subsystem - however this introduces
 *       more (and perhaps unnecessary) overhead.
 *
 ******************************************************************************/

struct acpi_namespace_node *acpi_ns_map_handle_to_node(acpi_handle handle)
{

      ACPI_FUNCTION_ENTRY();

      /*
       * Simple implementation
       */
      if ((!handle) || (handle == ACPI_ROOT_OBJECT)) {
            return (acpi_gbl_root_node);
      }

      /* We can at least attempt to verify the handle */

      if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) {
            return (NULL);
      }

      return (ACPI_CAST_PTR(struct acpi_namespace_node, handle));
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_convert_entry_to_handle
 *
 * PARAMETERS:  Node          - Node to be converted to a Handle
 *
 * RETURN:      A user handle
 *
 * DESCRIPTION: Convert a real Node to a namespace handle
 *
 ******************************************************************************/

acpi_handle acpi_ns_convert_entry_to_handle(struct acpi_namespace_node *node)
{

      /*
       * Simple implementation for now;
       */
      return ((acpi_handle) node);

/* Example future implementation ---------------------

      if (!Node)
      {
            return (NULL);
      }

      if (Node == acpi_gbl_root_node)
      {
            return (ACPI_ROOT_OBJECT);
      }

      return ((acpi_handle) Node);
------------------------------------------------------*/
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_terminate
 *
 * PARAMETERS:  none
 *
 * RETURN:      none
 *
 * DESCRIPTION: free memory allocated for namespace and ACPI table storage.
 *
 ******************************************************************************/

void acpi_ns_terminate(void)
{
      union acpi_operand_object *obj_desc;

      ACPI_FUNCTION_TRACE(ns_terminate);

      /*
       * 1) Free the entire namespace -- all nodes and objects
       *
       * Delete all object descriptors attached to namepsace nodes
       */
      acpi_ns_delete_namespace_subtree(acpi_gbl_root_node);

      /* Detach any objects attached to the root */

      obj_desc = acpi_ns_get_attached_object(acpi_gbl_root_node);
      if (obj_desc) {
            acpi_ns_detach_object(acpi_gbl_root_node);
      }

      ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Namespace freed\n"));
      return_VOID;
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_opens_scope
 *
 * PARAMETERS:  Type        - A valid namespace type
 *
 * RETURN:      NEWSCOPE if the passed type "opens a name scope" according
 *              to the ACPI specification, else 0
 *
 ******************************************************************************/

u32 acpi_ns_opens_scope(acpi_object_type type)
{
      ACPI_FUNCTION_TRACE_STR(ns_opens_scope, acpi_ut_get_type_name(type));

      if (!acpi_ut_valid_object_type(type)) {

            /* type code out of range  */

            ACPI_WARNING((AE_INFO, "Invalid Object Type %X", type));
            return_UINT32(ACPI_NS_NORMAL);
      }

      return_UINT32(((u32) acpi_gbl_ns_properties[type]) & ACPI_NS_NEWSCOPE);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_node
 *
 * PARAMETERS:  *Pathname   - Name to be found, in external (ASL) format. The
 *                            \ (backslash) and ^ (carat) prefixes, and the
 *                            . (period) to separate segments are supported.
 *              prefix_node  - Root of subtree to be searched, or NS_ALL for the
 *                            root of the name space.  If Name is fully
 *                            qualified (first s8 is '\'), the passed value
 *                            of Scope will not be accessed.
 *              Flags       - Used to indicate whether to perform upsearch or
 *                            not.
 *              return_node - Where the Node is returned
 *
 * DESCRIPTION: Look up a name relative to a given scope and return the
 *              corresponding Node.  NOTE: Scope can be null.
 *
 * MUTEX:       Locks namespace
 *
 ******************************************************************************/

acpi_status
acpi_ns_get_node(struct acpi_namespace_node *prefix_node,
             char *pathname,
             u32 flags, struct acpi_namespace_node **return_node)
{
      union acpi_generic_state scope_info;
      acpi_status status;
      char *internal_path;

      ACPI_FUNCTION_TRACE_PTR(ns_get_node, pathname);

      if (!pathname) {
            *return_node = prefix_node;
            if (!prefix_node) {
                  *return_node = acpi_gbl_root_node;
            }
            return_ACPI_STATUS(AE_OK);
      }

      /* Convert path to internal representation */

      status = acpi_ns_internalize_name(pathname, &internal_path);
      if (ACPI_FAILURE(status)) {
            return_ACPI_STATUS(status);
      }

      /* Must lock namespace during lookup */

      status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
      if (ACPI_FAILURE(status)) {
            goto cleanup;
      }

      /* Setup lookup scope (search starting point) */

      scope_info.scope.node = prefix_node;

      /* Lookup the name in the namespace */

      status = acpi_ns_lookup(&scope_info, internal_path, ACPI_TYPE_ANY,
                        ACPI_IMODE_EXECUTE,
                        (flags | ACPI_NS_DONT_OPEN_SCOPE), NULL,
                        return_node);
      if (ACPI_FAILURE(status)) {
            ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s, %s\n",
                          pathname, acpi_format_exception(status)));
      }

      (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);

      cleanup:
      ACPI_FREE(internal_path);
      return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_parent_node
 *
 * PARAMETERS:  Node       - Current table entry
 *
 * RETURN:      Parent entry of the given entry
 *
 * DESCRIPTION: Obtain the parent entry for a given entry in the namespace.
 *
 ******************************************************************************/

struct acpi_namespace_node *acpi_ns_get_parent_node(struct acpi_namespace_node
                                        *node)
{
      ACPI_FUNCTION_ENTRY();

      if (!node) {
            return (NULL);
      }

      /*
       * Walk to the end of this peer list. The last entry is marked with a flag
       * and the peer pointer is really a pointer back to the parent. This saves
       * putting a parent back pointer in each and every named object!
       */
      while (!(node->flags & ANOBJ_END_OF_PEER_LIST)) {
            node = node->peer;
      }

      return (node->peer);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_get_next_valid_node
 *
 * PARAMETERS:  Node       - Current table entry
 *
 * RETURN:      Next valid Node in the linked node list. NULL if no more valid
 *              nodes.
 *
 * DESCRIPTION: Find the next valid node within a name table.
 *              Useful for implementing NULL-end-of-list loops.
 *
 ******************************************************************************/

struct acpi_namespace_node *acpi_ns_get_next_valid_node(struct
                                          acpi_namespace_node
                                          *node)
{

      /* If we are at the end of this peer list, return NULL */

      if (node->flags & ANOBJ_END_OF_PEER_LIST) {
            return NULL;
      }

      /* Otherwise just return the next peer */

      return (node->peer);
}

#ifdef ACPI_OBSOLETE_FUNCTIONS
/*******************************************************************************
 *
 * FUNCTION:    acpi_ns_find_parent_name
 *
 * PARAMETERS:  *child_node            - Named Obj whose name is to be found
 *
 * RETURN:      The ACPI name
 *
 * DESCRIPTION: Search for the given obj in its parent scope and return the
 *              name segment, or "????" if the parent name can't be found
 *              (which "should not happen").
 *
 ******************************************************************************/

acpi_name acpi_ns_find_parent_name(struct acpi_namespace_node * child_node)
{
      struct acpi_namespace_node *parent_node;

      ACPI_FUNCTION_TRACE(ns_find_parent_name);

      if (child_node) {

            /* Valid entry.  Get the parent Node */

            parent_node = acpi_ns_get_parent_node(child_node);
            if (parent_node) {
                  ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                                "Parent of %p [%4.4s] is %p [%4.4s]\n",
                                child_node,
                                acpi_ut_get_node_name(child_node),
                                parent_node,
                                acpi_ut_get_node_name(parent_node)));

                  if (parent_node->name.integer) {
                        return_VALUE((acpi_name) parent_node->name.
                                   integer);
                  }
            }

            ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
                          "Unable to find parent of %p (%4.4s)\n",
                          child_node,
                          acpi_ut_get_node_name(child_node)));
      }

      return_VALUE(ACPI_UNKNOWN_NAME);
}
#endif

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