Merge commit 'v2.6.29-rc1' into irq/urgent

1 files changed, 997 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/nsutils.c b/drivers/acpi/acpica/nsutils.c
new file mode 100644
index 000000000000..3e1149bf4aa5
--- /dev/null
+++ b/drivers/acpi/acpica/nsutils.c
@@ -0,0 +1,997 @@
+/******************************************************************************
+ *
+ * Module Name: nsutils - Utilities for accessing ACPI namespace, accessing
+ *                        parents and siblings and Scope manipulation
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2008, 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"
+#include "amlcode.h"
+#include "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(const char *module_name,
+                     u32 line_number,
+                     const 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(const char *module_name,
+                            u32 line_number,
+                            const char *message,
+                            struct acpi_namespace_node *prefix_node,
+                            const 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,
+                            const 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)
+{
+        const 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)) {
+                info->fully_qualified = TRUE;
+                next_external_char++;
+
+                /* Skip redundant root_prefix, like \\_SB.PCI0.SBRG.EC0 */
+
+                while (acpi_ns_valid_root_prefix(*next_external_char)) {
+                        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;
+        const char *external_name = info->next_external_char;
+        char *result = NULL;
+        u32 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_size) i + 1];
+                } else {
+                        internal_name[i] = AML_MULTI_NAME_PREFIX_OP;
+                        internal_name[(acpi_size) i + 1] = (char)num_segments;
+                        result = &internal_name[(acpi_size) 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(const 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,
+                         const char *internal_name,
+                         u32 * converted_name_length, char **converted_name)
+{
+        u32 names_index = 0;
+        u32 num_segments = 0;
+        u32 required_length;
+        u32 prefix_length = 0;
+        u32 i = 0;
+        u32 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 = (u8)
+                            internal_name[(acpi_size) 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,
+                 const 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