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/******************************************************************************

 *

 * Module Name: nsrepair2 - Repair for objects returned by specific

 *                          predefined methods

 *

 *****************************************************************************/

/*

 * Copyright (C) 2000 - 2015, 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 

#include "accommon.h"

#include "acnamesp.h"

#define _COMPONENT          ACPI_NAMESPACE

ACPI_MODULE_NAME("nsrepair2")

/*

 * Information structure and handler for ACPI predefined names that can

 * be repaired on a per-name basis.

 */

typedef

acpi_status(*acpi_repair_function) (struct acpi_evaluate_info * info,

				    union acpi_operand_object

				    **return_object_ptr);

typedef struct acpi_repair_info {

	char name[ACPI_NAME_SIZE];

	acpi_repair_function repair_function;

} acpi_repair_info;

/* Local prototypes */

static const struct acpi_repair_info *acpi_ns_match_complex_repair(struct

								   acpi_namespace_node

								   *node);

static acpi_status

acpi_ns_repair_ALR(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr);

static acpi_status

acpi_ns_repair_CID(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr);

static acpi_status

acpi_ns_repair_CST(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr);

static acpi_status

acpi_ns_repair_FDE(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr);

static acpi_status

acpi_ns_repair_HID(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr);

static acpi_status

acpi_ns_repair_PRT(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr);

static acpi_status

acpi_ns_repair_PSS(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr);

static acpi_status

acpi_ns_repair_TSS(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr);

static acpi_status

acpi_ns_check_sorted_list(struct acpi_evaluate_info *info,

			  union acpi_operand_object *return_object,

			  u32 start_index,

			  u32 expected_count,

			  u32 sort_index,

			  u8 sort_direction, char *sort_key_name);

/* Values for sort_direction above */

#define ACPI_SORT_ASCENDING     0

#define ACPI_SORT_DESCENDING    1

static void

acpi_ns_remove_element(union acpi_operand_object *obj_desc, u32 index);

static void

acpi_ns_sort_list(union acpi_operand_object **elements,

		  u32 count, u32 index, u8 sort_direction);

/*

 * This table contains the names of the predefined methods for which we can

 * perform more complex repairs.

 *

 * As necessary:

 *

 * _ALR: Sort the list ascending by ambient_illuminance

 * _CID: Strings: uppercase all, remove any leading asterisk

 * _CST: Sort the list ascending by C state type

 * _FDE: Convert Buffer of BYTEs to a Buffer of DWORDs

 * _GTM: Convert Buffer of BYTEs to a Buffer of DWORDs

 * _HID: Strings: uppercase all, remove any leading asterisk

 * _PRT: Fix reversed source_name and source_index

 * _PSS: Sort the list descending by Power

 * _TSS: Sort the list descending by Power

 *

 * Names that must be packages, but cannot be sorted:

 *

 * _BCL: Values are tied to the Package index where they appear, and cannot

 * be moved or sorted. These index values are used for _BQC and _BCM.

 * However, we can fix the case where a buffer is returned, by converting

 * it to a Package of integers.

 */

static const struct acpi_repair_info acpi_ns_repairable_names[] = {

	{"_ALR", acpi_ns_repair_ALR},

	{"_CID", acpi_ns_repair_CID},

	{"_CST", acpi_ns_repair_CST},

	{"_FDE", acpi_ns_repair_FDE},

	{"_GTM", acpi_ns_repair_FDE},	/* _GTM has same repair as _FDE */

	{"_HID", acpi_ns_repair_HID},

	{"_PRT", acpi_ns_repair_PRT},

	{"_PSS", acpi_ns_repair_PSS},

	{"_TSS", acpi_ns_repair_TSS},

	{{0, 0, 0, 0}, NULL}	/* Table terminator */

};

#define ACPI_FDE_FIELD_COUNT        5

#define ACPI_FDE_BYTE_BUFFER_SIZE   5

#define ACPI_FDE_DWORD_BUFFER_SIZE  (ACPI_FDE_FIELD_COUNT * sizeof (u32))

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_complex_repairs

 *

 * PARAMETERS:  info                - Method execution information block

 *              node                - Namespace node for the method/object

 *              validate_status     - Original status of earlier validation

 *              return_object_ptr   - Pointer to the object returned from the

 *                                    evaluation of a method or object

 *

 * RETURN:      Status. AE_OK if repair was successful. If name is not

 *              matched, validate_status is returned.

 *

 * DESCRIPTION: Attempt to repair/convert a return object of a type that was

 *              not expected.

 *

 *****************************************************************************/

acpi_status

acpi_ns_complex_repairs(struct acpi_evaluate_info *info,

			struct acpi_namespace_node *node,

			acpi_status validate_status,

			union acpi_operand_object **return_object_ptr)

{

	const struct acpi_repair_info *predefined;

	acpi_status status;

	/* Check if this name is in the list of repairable names */

	predefined = acpi_ns_match_complex_repair(node);

	if (!predefined) {

		return (validate_status);

	}

	status = predefined->repair_function(info, return_object_ptr);

	return (status);

}

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_match_complex_repair

 *

 * PARAMETERS:  node                - Namespace node for the method/object

 *

 * RETURN:      Pointer to entry in repair table. NULL indicates not found.

 *

 * DESCRIPTION: Check an object name against the repairable object list.

 *

 *****************************************************************************/

static const struct acpi_repair_info *acpi_ns_match_complex_repair(struct

								   acpi_namespace_node

								   *node)

{

	const struct acpi_repair_info *this_name;

	/* Search info table for a repairable predefined method/object name */

	this_name = acpi_ns_repairable_names;

	while (this_name->repair_function) {

		if (ACPI_COMPARE_NAME(node->name.ascii, this_name->name)) {

			return (this_name);

		}

		this_name++;

	}

	return (NULL);		/* Not found */

}

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_repair_ALR

 *

 * PARAMETERS:  info                - Method execution information block

 *              return_object_ptr   - Pointer to the object returned from the

 *                                    evaluation of a method or object

 *

 * RETURN:      Status. AE_OK if object is OK or was repaired successfully

 *

 * DESCRIPTION: Repair for the _ALR object. If necessary, sort the object list

 *              ascending by the ambient illuminance values.

 *

 *****************************************************************************/

static acpi_status

acpi_ns_repair_ALR(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr)

{

	union acpi_operand_object *return_object = *return_object_ptr;

	acpi_status status;

	status = acpi_ns_check_sorted_list(info, return_object, 0, 2, 1,

					   ACPI_SORT_ASCENDING,

					   "AmbientIlluminance");

	return (status);

}

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_repair_FDE

 *

 * PARAMETERS:  info                - Method execution information block

 *              return_object_ptr   - Pointer to the object returned from the

 *                                    evaluation of a method or object

 *

 * RETURN:      Status. AE_OK if object is OK or was repaired successfully

 *

 * DESCRIPTION: Repair for the _FDE and _GTM objects. The expected return

 *              value is a Buffer of 5 DWORDs. This function repairs a common

 *              problem where the return value is a Buffer of BYTEs, not

 *              DWORDs.

 *

 *****************************************************************************/

static acpi_status

acpi_ns_repair_FDE(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr)

{

	union acpi_operand_object *return_object = *return_object_ptr;

	union acpi_operand_object *buffer_object;

	u8 *byte_buffer;

	u32 *dword_buffer;

	u32 i;

	ACPI_FUNCTION_NAME(ns_repair_FDE);

	switch (return_object->common.type) {

	case ACPI_TYPE_BUFFER:

		/* This is the expected type. Length should be (at least) 5 DWORDs */

		if (return_object->buffer.length >= ACPI_FDE_DWORD_BUFFER_SIZE) {

			return (AE_OK);

		}

		/* We can only repair if we have exactly 5 BYTEs */

		if (return_object->buffer.length != ACPI_FDE_BYTE_BUFFER_SIZE) {

			ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,

					      info->node_flags,

					      "Incorrect return buffer length %u, expected %u",

					      return_object->buffer.length,

					      ACPI_FDE_DWORD_BUFFER_SIZE));

			return (AE_AML_OPERAND_TYPE);

		}

		/* Create the new (larger) buffer object */

		buffer_object =

		    acpi_ut_create_buffer_object(ACPI_FDE_DWORD_BUFFER_SIZE);

		if (!buffer_object) {

			return (AE_NO_MEMORY);

		}

		/* Expand each byte to a DWORD */

		byte_buffer = return_object->buffer.pointer;

		dword_buffer =

		    ACPI_CAST_PTR(u32, buffer_object->buffer.pointer);

		for (i = 0; i < ACPI_FDE_FIELD_COUNT; i++) {

			*dword_buffer = (u32) *byte_buffer;

			dword_buffer++;

			byte_buffer++;

		}

		ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,

				  "%s Expanded Byte Buffer to expected DWord Buffer\n",

				  info->full_pathname));

		break;

	default:

		return (AE_AML_OPERAND_TYPE);

	}

	/* Delete the original return object, return the new buffer object */

	acpi_ut_remove_reference(return_object);

	*return_object_ptr = buffer_object;

	info->return_flags |= ACPI_OBJECT_REPAIRED;

	return (AE_OK);

}

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_repair_CID

 *

 * PARAMETERS:  info                - Method execution information block

 *              return_object_ptr   - Pointer to the object returned from the

 *                                    evaluation of a method or object

 *

 * RETURN:      Status. AE_OK if object is OK or was repaired successfully

 *

 * DESCRIPTION: Repair for the _CID object. If a string, ensure that all

 *              letters are uppercase and that there is no leading asterisk.

 *              If a Package, ensure same for all string elements.

 *

 *****************************************************************************/

static acpi_status

acpi_ns_repair_CID(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr)

{

	acpi_status status;

	union acpi_operand_object *return_object = *return_object_ptr;

	union acpi_operand_object **element_ptr;

	union acpi_operand_object *original_element;

	u16 original_ref_count;

	u32 i;

	/* Check for _CID as a simple string */

	if (return_object->common.type == ACPI_TYPE_STRING) {

		status = acpi_ns_repair_HID(info, return_object_ptr);

		return (status);

	}

	/* Exit if not a Package */

	if (return_object->common.type != ACPI_TYPE_PACKAGE) {

		return (AE_OK);

	}

	/* Examine each element of the _CID package */

	element_ptr = return_object->package.elements;

	for (i = 0; i < return_object->package.count; i++) {

		original_element = *element_ptr;

		original_ref_count = original_element->common.reference_count;

		status = acpi_ns_repair_HID(info, element_ptr);

		if (ACPI_FAILURE(status)) {

			return (status);

		}

		/* Take care with reference counts */

		if (original_element != *element_ptr) {

			/* Element was replaced */

			(*element_ptr)->common.reference_count =

			    original_ref_count;

			acpi_ut_remove_reference(original_element);

		}

		element_ptr++;

	}

	return (AE_OK);

}

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_repair_CST

 *

 * PARAMETERS:  info                - Method execution information block

 *              return_object_ptr   - Pointer to the object returned from the

 *                                    evaluation of a method or object

 *

 * RETURN:      Status. AE_OK if object is OK or was repaired successfully

 *

 * DESCRIPTION: Repair for the _CST object:

 *              1. Sort the list ascending by C state type

 *              2. Ensure type cannot be zero

 *              3. A subpackage count of zero means _CST is meaningless

 *              4. Count must match the number of C state subpackages

 *

 *****************************************************************************/

static acpi_status

acpi_ns_repair_CST(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr)

{

	union acpi_operand_object *return_object = *return_object_ptr;

	union acpi_operand_object **outer_elements;

	u32 outer_element_count;

	union acpi_operand_object *obj_desc;

	acpi_status status;

	u8 removing;

	u32 i;

	ACPI_FUNCTION_NAME(ns_repair_CST);

	/*

	 * Check if the C-state type values are proportional.

	 */

	outer_element_count = return_object->package.count - 1;

	i = 0;

	while (i < outer_element_count) {

		outer_elements = &return_object->package.elements[i + 1];

		removing = FALSE;

		if ((*outer_elements)->package.count == 0) {

			ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,

					      info->node_flags,

					      "SubPackage[%u] - removing entry due to zero count",

					      i));

			removing = TRUE;

			goto remove_element;

		}

		obj_desc = (*outer_elements)->package.elements[1];	/* Index1 = Type */

		if ((u32)obj_desc->integer.value == 0) {

			ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,

					      info->node_flags,

					      "SubPackage[%u] - removing entry due to invalid Type(0)",

					      i));

			removing = TRUE;

		}

remove_element:

		if (removing) {

			acpi_ns_remove_element(return_object, i + 1);

			outer_element_count--;

		} else {

			i++;

		}

	}

	/* Update top-level package count, Type "Integer" checked elsewhere */

	obj_desc = return_object->package.elements[0];

	obj_desc->integer.value = outer_element_count;

	/*

	 * Entries (subpackages) in the _CST Package must be sorted by the

	 * C-state type, in ascending order.

	 */

	status = acpi_ns_check_sorted_list(info, return_object, 1, 4, 1,

					   ACPI_SORT_ASCENDING, "C-State Type");

	if (ACPI_FAILURE(status)) {

		return (status);

	}

	return (AE_OK);

}

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_repair_HID

 *

 * PARAMETERS:  info                - Method execution information block

 *              return_object_ptr   - Pointer to the object returned from the

 *                                    evaluation of a method or object

 *

 * RETURN:      Status. AE_OK if object is OK or was repaired successfully

 *

 * DESCRIPTION: Repair for the _HID object. If a string, ensure that all

 *              letters are uppercase and that there is no leading asterisk.

 *

 *****************************************************************************/

static acpi_status

acpi_ns_repair_HID(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr)

{

	union acpi_operand_object *return_object = *return_object_ptr;

	union acpi_operand_object *new_string;

	char *source;

	char *dest;

	ACPI_FUNCTION_NAME(ns_repair_HID);

	/* We only care about string _HID objects (not integers) */

	if (return_object->common.type != ACPI_TYPE_STRING) {

		return (AE_OK);

	}

	if (return_object->string.length == 0) {

		ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,

				      info->node_flags,

				      "Invalid zero-length _HID or _CID string"));

		/* Return AE_OK anyway, let driver handle it */

		info->return_flags |= ACPI_OBJECT_REPAIRED;

		return (AE_OK);

	}

	/* It is simplest to always create a new string object */

	new_string = acpi_ut_create_string_object(return_object->string.length);

	if (!new_string) {

		return (AE_NO_MEMORY);

	}

	/*

	 * Remove a leading asterisk if present. For some unknown reason, there

	 * are many machines in the field that contains IDs like this.

	 *

	 * Examples: "*PNP0C03", "*ACPI0003"

	 */

	source = return_object->string.pointer;

	if (*source == '*') {

		source++;

		new_string->string.length--;

		ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,

				  "%s: Removed invalid leading asterisk\n",

				  info->full_pathname));

	}

	/*

	 * Copy and uppercase the string. From the ACPI 5.0 specification:

	 *

	 * A valid PNP ID must be of the form "AAA####" where A is an uppercase

	 * letter and # is a hex digit. A valid ACPI ID must be of the form

	 * "NNNN####" where N is an uppercase letter or decimal digit, and

	 * # is a hex digit.

	 */

	for (dest = new_string->string.pointer; *source; dest++, source++) {

		*dest = (char)toupper((int)*source);

	}

	acpi_ut_remove_reference(return_object);

	*return_object_ptr = new_string;

	return (AE_OK);

}

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_repair_PRT

 *

 * PARAMETERS:  info                - Method execution information block

 *              return_object_ptr   - Pointer to the object returned from the

 *                                    evaluation of a method or object

 *

 * RETURN:      Status. AE_OK if object is OK or was repaired successfully

 *

 * DESCRIPTION: Repair for the _PRT object. If necessary, fix reversed

 *              source_name and source_index field, a common BIOS bug.

 *

 *****************************************************************************/

static acpi_status

acpi_ns_repair_PRT(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr)

{

	union acpi_operand_object *package_object = *return_object_ptr;

	union acpi_operand_object **top_object_list;

	union acpi_operand_object **sub_object_list;

	union acpi_operand_object *obj_desc;

	union acpi_operand_object *sub_package;

	u32 element_count;

	u32 index;

	/* Each element in the _PRT package is a subpackage */

	top_object_list = package_object->package.elements;

	element_count = package_object->package.count;

	/* Examine each subpackage */

	for (index = 0; index < element_count; index++, top_object_list++) {

		sub_package = *top_object_list;

		sub_object_list = sub_package->package.elements;

		/* Check for minimum required element count */

		if (sub_package->package.count < 4) {

			continue;

		}

		/*

		 * If the BIOS has erroneously reversed the _PRT source_name (index 2)

		 * and the source_index (index 3), fix it. _PRT is important enough to

		 * workaround this BIOS error. This also provides compatibility with

		 * other ACPI implementations.

		 */

		obj_desc = sub_object_list[3];

		if (!obj_desc || (obj_desc->common.type != ACPI_TYPE_INTEGER)) {

			sub_object_list[3] = sub_object_list[2];

			sub_object_list[2] = obj_desc;

			info->return_flags |= ACPI_OBJECT_REPAIRED;

			ACPI_WARN_PREDEFINED((AE_INFO,

					      info->full_pathname,

					      info->node_flags,

					      "PRT[%X]: Fixed reversed SourceName and SourceIndex",

					      index));

		}

	}

	return (AE_OK);

}

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_repair_PSS

 *

 * PARAMETERS:  info                - Method execution information block

 *              return_object_ptr   - Pointer to the object returned from the

 *                                    evaluation of a method or object

 *

 * RETURN:      Status. AE_OK if object is OK or was repaired successfully

 *

 * DESCRIPTION: Repair for the _PSS object. If necessary, sort the object list

 *              by the CPU frequencies. Check that the power dissipation values

 *              are all proportional to CPU frequency (i.e., sorting by

 *              frequency should be the same as sorting by power.)

 *

 *****************************************************************************/

static acpi_status

acpi_ns_repair_PSS(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr)

{

	union acpi_operand_object *return_object = *return_object_ptr;

	union acpi_operand_object **outer_elements;

	u32 outer_element_count;

	union acpi_operand_object **elements;

	union acpi_operand_object *obj_desc;

	u32 previous_value;

	acpi_status status;

	u32 i;

	/*

	 * Entries (subpackages) in the _PSS Package must be sorted by power

	 * dissipation, in descending order. If it appears that the list is

	 * incorrectly sorted, sort it. We sort by cpu_frequency, since this

	 * should be proportional to the power.

	 */

	status = acpi_ns_check_sorted_list(info, return_object, 0, 6, 0,

					   ACPI_SORT_DESCENDING,

					   "CpuFrequency");

	if (ACPI_FAILURE(status)) {

		return (status);

	}

	/*

	 * We now know the list is correctly sorted by CPU frequency. Check if

	 * the power dissipation values are proportional.

	 */

	previous_value = ACPI_UINT32_MAX;

	outer_elements = return_object->package.elements;

	outer_element_count = return_object->package.count;

	for (i = 0; i < outer_element_count; i++) {

		elements = (*outer_elements)->package.elements;

		obj_desc = elements[1];	/* Index1 = power_dissipation */

		if ((u32) obj_desc->integer.value > previous_value) {

			ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,

					      info->node_flags,

					      "SubPackage[%u,%u] - suspicious power dissipation values",

					      i - 1, i));

		}

		previous_value = (u32) obj_desc->integer.value;

		outer_elements++;

	}

	return (AE_OK);

}

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_repair_TSS

 *

 * PARAMETERS:  info                - Method execution information block

 *              return_object_ptr   - Pointer to the object returned from the

 *                                    evaluation of a method or object

 *

 * RETURN:      Status. AE_OK if object is OK or was repaired successfully

 *

 * DESCRIPTION: Repair for the _TSS object. If necessary, sort the object list

 *              descending by the power dissipation values.

 *

 *****************************************************************************/

static acpi_status

acpi_ns_repair_TSS(struct acpi_evaluate_info *info,

		   union acpi_operand_object **return_object_ptr)

{

	union acpi_operand_object *return_object = *return_object_ptr;

	acpi_status status;

	struct acpi_namespace_node *node;

	/*

	 * We can only sort the _TSS return package if there is no _PSS in the

	 * same scope. This is because if _PSS is present, the ACPI specification

	 * dictates that the _TSS Power Dissipation field is to be ignored, and

	 * therefore some BIOSs leave garbage values in the _TSS Power field(s).

	 * In this case, it is best to just return the _TSS package as-is.

	 * (May, 2011)

	 */

	status = acpi_ns_get_node(info->node, "^_PSS",

				  ACPI_NS_NO_UPSEARCH, &node);

	if (ACPI_SUCCESS(status)) {

		return (AE_OK);

	}

	status = acpi_ns_check_sorted_list(info, return_object, 0, 5, 1,

					   ACPI_SORT_DESCENDING,

					   "PowerDissipation");

	return (status);

}

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_check_sorted_list

 *

 * PARAMETERS:  info                - Method execution information block

 *              return_object       - Pointer to the top-level returned object

 *              start_index         - Index of the first subpackage

 *              expected_count      - Minimum length of each subpackage

 *              sort_index          - Subpackage entry to sort on

 *              sort_direction      - Ascending or descending

 *              sort_key_name       - Name of the sort_index field

 *

 * RETURN:      Status. AE_OK if the list is valid and is sorted correctly or

 *              has been repaired by sorting the list.

 *

 * DESCRIPTION: Check if the package list is valid and sorted correctly by the

 *              sort_index. If not, then sort the list.

 *

 *****************************************************************************/

static acpi_status

acpi_ns_check_sorted_list(struct acpi_evaluate_info *info,

			  union acpi_operand_object *return_object,

			  u32 start_index,

			  u32 expected_count,

			  u32 sort_index,

			  u8 sort_direction, char *sort_key_name)

{

	u32 outer_element_count;

	union acpi_operand_object **outer_elements;

	union acpi_operand_object **elements;

	union acpi_operand_object *obj_desc;

	u32 i;

	u32 previous_value;

	ACPI_FUNCTION_NAME(ns_check_sorted_list);

	/* The top-level object must be a package */

	if (return_object->common.type != ACPI_TYPE_PACKAGE) {

		return (AE_AML_OPERAND_TYPE);

	}

	/*

	 * NOTE: assumes list of subpackages contains no NULL elements.

	 * Any NULL elements should have been removed by earlier call

	 * to acpi_ns_remove_null_elements.

	 */

	outer_element_count = return_object->package.count;

	if (!outer_element_count || start_index >= outer_element_count) {

		return (AE_AML_PACKAGE_LIMIT);

	}

	outer_elements = &return_object->package.elements[start_index];

	outer_element_count -= start_index;

	previous_value = 0;

	if (sort_direction == ACPI_SORT_DESCENDING) {

		previous_value = ACPI_UINT32_MAX;

	}

	/* Examine each subpackage */

	for (i = 0; i < outer_element_count; i++) {

		/* Each element of the top-level package must also be a package */

		if ((*outer_elements)->common.type != ACPI_TYPE_PACKAGE) {

			return (AE_AML_OPERAND_TYPE);

		}

		/* Each subpackage must have the minimum length */

		if ((*outer_elements)->package.count < expected_count) {

			return (AE_AML_PACKAGE_LIMIT);

		}

		elements = (*outer_elements)->package.elements;

		obj_desc = elements[sort_index];

		if (obj_desc->common.type != ACPI_TYPE_INTEGER) {

			return (AE_AML_OPERAND_TYPE);

		}

		/*

		 * The list must be sorted in the specified order. If we detect a

		 * discrepancy, sort the entire list.

		 */

		if (((sort_direction == ACPI_SORT_ASCENDING) &&

		     (obj_desc->integer.value < previous_value)) ||

		    ((sort_direction == ACPI_SORT_DESCENDING) &&

		     (obj_desc->integer.value > previous_value))) {

			acpi_ns_sort_list(&return_object->package.

					  elements[start_index],

					  outer_element_count, sort_index,

					  sort_direction);

			info->return_flags |= ACPI_OBJECT_REPAIRED;

			ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,

					  "%s: Repaired unsorted list - now sorted by %s\n",

					  info->full_pathname, sort_key_name));

			return (AE_OK);

		}

		previous_value = (u32) obj_desc->integer.value;

		outer_elements++;

	}

	return (AE_OK);

}

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_sort_list

 *

 * PARAMETERS:  elements            - Package object element list

 *              count               - Element count for above

 *              index               - Sort by which package element

 *              sort_direction      - Ascending or Descending sort

 *

 * RETURN:      None

 *

 * DESCRIPTION: Sort the objects that are in a package element list.

 *

 * NOTE: Assumes that all NULL elements have been removed from the package,

 *       and that all elements have been verified to be of type Integer.

 *

 *****************************************************************************/

static void

acpi_ns_sort_list(union acpi_operand_object **elements,

		  u32 count, u32 index, u8 sort_direction)

{

	union acpi_operand_object *obj_desc1;

	union acpi_operand_object *obj_desc2;

	union acpi_operand_object *temp_obj;

	u32 i;

	u32 j;

	/* Simple bubble sort */

	for (i = 1; i < count; i++) {

		for (j = (count - 1); j >= i; j--) {

			obj_desc1 = elements[j - 1]->package.elements[index];

			obj_desc2 = elements[j]->package.elements[index];

			if (((sort_direction == ACPI_SORT_ASCENDING) &&

			     (obj_desc1->integer.value >

			      obj_desc2->integer.value))

			    || ((sort_direction == ACPI_SORT_DESCENDING)

				&& (obj_desc1->integer.value <

				    obj_desc2->integer.value))) {

				temp_obj = elements[j - 1];

				elements[j - 1] = elements[j];

				elements[j] = temp_obj;

			}

		}

	}

}

/******************************************************************************

 *

 * FUNCTION:    acpi_ns_remove_element

 *

 * PARAMETERS:  obj_desc            - Package object element list

 *              index               - Index of element to remove

 *

 * RETURN:      None

 *

 * DESCRIPTION: Remove the requested element of a package and delete it.

 *

 *****************************************************************************/

static void

acpi_ns_remove_element(union acpi_operand_object *obj_desc, u32 index)

{

	union acpi_operand_object **source;

	union acpi_operand_object **dest;

	u32 count;

	u32 new_count;

	u32 i;

	ACPI_FUNCTION_NAME(ns_remove_element);

	count = obj_desc->package.count;

	new_count = count - 1;

	source = obj_desc->package.elements;

	dest = source;

	/* Examine all elements of the package object, remove matched index */

	for (i = 0; i < count; i++) {

		if (i == index) {

			acpi_ut_remove_reference(*source);	/* Remove one ref for being in pkg */

			acpi_ut_remove_reference(*source);

		} else {

			*dest = *source;

			dest++;

		}

		source++;

	}

	/* NULL terminate list and update the package count */

	*dest = NULL;

	obj_desc->package.count = new_count;

}