LCOV - code coverage report
Current view: top level - drivers/acpi/acpica - nsrepair.c (source / functions) Hit Total Coverage
Test: combined.info Lines: 41 116 35.3 %
Date: 2022-04-01 14:58:12 Functions: 3 5 60.0 %
Branches: 18 70 25.7 %

           Branch data     Line data    Source code
       1                 :            : // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
       2                 :            : /******************************************************************************
       3                 :            :  *
       4                 :            :  * Module Name: nsrepair - Repair for objects returned by predefined methods
       5                 :            :  *
       6                 :            :  * Copyright (C) 2000 - 2020, Intel Corp.
       7                 :            :  *
       8                 :            :  *****************************************************************************/
       9                 :            : 
      10                 :            : #include <acpi/acpi.h>
      11                 :            : #include "accommon.h"
      12                 :            : #include "acnamesp.h"
      13                 :            : #include "acinterp.h"
      14                 :            : #include "acpredef.h"
      15                 :            : #include "amlresrc.h"
      16                 :            : 
      17                 :            : #define _COMPONENT          ACPI_NAMESPACE
      18                 :            : ACPI_MODULE_NAME("nsrepair")
      19                 :            : 
      20                 :            : /*******************************************************************************
      21                 :            :  *
      22                 :            :  * This module attempts to repair or convert objects returned by the
      23                 :            :  * predefined methods to an object type that is expected, as per the ACPI
      24                 :            :  * specification. The need for this code is dictated by the many machines that
      25                 :            :  * return incorrect types for the standard predefined methods. Performing these
      26                 :            :  * conversions here, in one place, eliminates the need for individual ACPI
      27                 :            :  * device drivers to do the same. Note: Most of these conversions are different
      28                 :            :  * than the internal object conversion routines used for implicit object
      29                 :            :  * conversion.
      30                 :            :  *
      31                 :            :  * The following conversions can be performed as necessary:
      32                 :            :  *
      33                 :            :  * Integer -> String
      34                 :            :  * Integer -> Buffer
      35                 :            :  * String  -> Integer
      36                 :            :  * String  -> Buffer
      37                 :            :  * Buffer  -> Integer
      38                 :            :  * Buffer  -> String
      39                 :            :  * Buffer  -> Package of Integers
      40                 :            :  * Package -> Package of one Package
      41                 :            :  *
      42                 :            :  * Additional conversions that are available:
      43                 :            :  *  Convert a null return or zero return value to an end_tag descriptor
      44                 :            :  *  Convert an ASCII string to a Unicode buffer
      45                 :            :  *
      46                 :            :  * An incorrect standalone object is wrapped with required outer package
      47                 :            :  *
      48                 :            :  * Additional possible repairs:
      49                 :            :  * Required package elements that are NULL replaced by Integer/String/Buffer
      50                 :            :  *
      51                 :            :  ******************************************************************************/
      52                 :            : /* Local prototypes */
      53                 :            : static const struct acpi_simple_repair_info *acpi_ns_match_simple_repair(struct
      54                 :            :                                                                          acpi_namespace_node
      55                 :            :                                                                          *node,
      56                 :            :                                                                          u32
      57                 :            :                                                                          return_btype,
      58                 :            :                                                                          u32
      59                 :            :                                                                          package_index);
      60                 :            : 
      61                 :            : /*
      62                 :            :  * Special but simple repairs for some names.
      63                 :            :  *
      64                 :            :  * 2nd argument: Unexpected types that can be repaired
      65                 :            :  */
      66                 :            : static const struct acpi_simple_repair_info acpi_object_repair_info[] = {
      67                 :            :         /* Resource descriptor conversions */
      68                 :            : 
      69                 :            :         {"_CRS",
      70                 :            :          ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER |
      71                 :            :          ACPI_RTYPE_NONE,
      72                 :            :          ACPI_NOT_PACKAGE_ELEMENT,
      73                 :            :          acpi_ns_convert_to_resource},
      74                 :            :         {"_DMA",
      75                 :            :          ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER |
      76                 :            :          ACPI_RTYPE_NONE,
      77                 :            :          ACPI_NOT_PACKAGE_ELEMENT,
      78                 :            :          acpi_ns_convert_to_resource},
      79                 :            :         {"_PRS",
      80                 :            :          ACPI_RTYPE_INTEGER | ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER |
      81                 :            :          ACPI_RTYPE_NONE,
      82                 :            :          ACPI_NOT_PACKAGE_ELEMENT,
      83                 :            :          acpi_ns_convert_to_resource},
      84                 :            : 
      85                 :            :         /* Object reference conversions */
      86                 :            : 
      87                 :            :         {"_DEP", ACPI_RTYPE_STRING, ACPI_ALL_PACKAGE_ELEMENTS,
      88                 :            :          acpi_ns_convert_to_reference},
      89                 :            : 
      90                 :            :         /* Unicode conversions */
      91                 :            : 
      92                 :            :         {"_MLS", ACPI_RTYPE_STRING, 1,
      93                 :            :          acpi_ns_convert_to_unicode},
      94                 :            :         {"_STR", ACPI_RTYPE_STRING | ACPI_RTYPE_BUFFER,
      95                 :            :          ACPI_NOT_PACKAGE_ELEMENT,
      96                 :            :          acpi_ns_convert_to_unicode},
      97                 :            :         {{0, 0, 0, 0}, 0, 0, NULL}      /* Table terminator */
      98                 :            : };
      99                 :            : 
     100                 :            : /*******************************************************************************
     101                 :            :  *
     102                 :            :  * FUNCTION:    acpi_ns_simple_repair
     103                 :            :  *
     104                 :            :  * PARAMETERS:  info                - Method execution information block
     105                 :            :  *              expected_btypes     - Object types expected
     106                 :            :  *              package_index       - Index of object within parent package (if
     107                 :            :  *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
     108                 :            :  *                                    otherwise)
     109                 :            :  *              return_object_ptr   - Pointer to the object returned from the
     110                 :            :  *                                    evaluation of a method or object
     111                 :            :  *
     112                 :            :  * RETURN:      Status. AE_OK if repair was successful.
     113                 :            :  *
     114                 :            :  * DESCRIPTION: Attempt to repair/convert a return object of a type that was
     115                 :            :  *              not expected.
     116                 :            :  *
     117                 :            :  ******************************************************************************/
     118                 :            : 
     119                 :            : acpi_status
     120                 :       3381 : acpi_ns_simple_repair(struct acpi_evaluate_info *info,
     121                 :            :                       u32 expected_btypes,
     122                 :            :                       u32 package_index,
     123                 :            :                       union acpi_operand_object **return_object_ptr)
     124                 :            : {
     125                 :       3381 :         union acpi_operand_object *return_object = *return_object_ptr;
     126                 :       3381 :         union acpi_operand_object *new_object = NULL;
     127                 :       3381 :         acpi_status status;
     128                 :       3381 :         const struct acpi_simple_repair_info *predefined;
     129                 :            : 
     130                 :       3381 :         ACPI_FUNCTION_NAME(ns_simple_repair);
     131                 :            : 
     132                 :            :         /*
     133                 :            :          * Special repairs for certain names that are in the repair table.
     134                 :            :          * Check if this name is in the list of repairable names.
     135                 :            :          */
     136                 :       3381 :         predefined = acpi_ns_match_simple_repair(info->node,
     137                 :            :                                                  info->return_btype,
     138                 :            :                                                  package_index);
     139         [ +  + ]:       3381 :         if (predefined) {
     140         [ -  + ]:        120 :                 if (!return_object) {
     141                 :          0 :                         ACPI_WARN_PREDEFINED((AE_INFO, info->full_pathname,
     142                 :            :                                               ACPI_WARN_ALWAYS,
     143                 :            :                                               "Missing expected return value"));
     144                 :            :                 }
     145                 :            : 
     146                 :        120 :                 status = predefined->object_converter(info->node, return_object,
     147                 :            :                                                       &new_object);
     148         [ -  + ]:        120 :                 if (ACPI_FAILURE(status)) {
     149                 :            : 
     150                 :            :                         /* A fatal error occurred during a conversion */
     151                 :            : 
     152                 :          0 :                         ACPI_EXCEPTION((AE_INFO, status,
     153                 :            :                                         "During return object analysis"));
     154                 :          0 :                         return (status);
     155                 :            :                 }
     156         [ -  + ]:        120 :                 if (new_object) {
     157                 :          0 :                         goto object_repaired;
     158                 :            :                 }
     159                 :            :         }
     160                 :            : 
     161                 :            :         /*
     162                 :            :          * Do not perform simple object repair unless the return type is not
     163                 :            :          * expected.
     164                 :            :          */
     165         [ -  + ]:       3381 :         if (info->return_btype & expected_btypes) {
     166                 :            :                 return (AE_OK);
     167                 :            :         }
     168                 :            : 
     169                 :            :         /*
     170                 :            :          * At this point, we know that the type of the returned object was not
     171                 :            :          * one of the expected types for this predefined name. Attempt to
     172                 :            :          * repair the object by converting it to one of the expected object
     173                 :            :          * types for this predefined name.
     174                 :            :          */
     175                 :            : 
     176                 :            :         /*
     177                 :            :          * If there is no return value, check if we require a return value for
     178                 :            :          * this predefined name. Either one return value is expected, or none,
     179                 :            :          * for both methods and other objects.
     180                 :            :          *
     181                 :            :          * Try to fix if there was no return object. Warning if failed to fix.
     182                 :            :          */
     183         [ #  # ]:          0 :         if (!return_object) {
     184   [ #  #  #  # ]:          0 :                 if (expected_btypes && (!(expected_btypes & ACPI_RTYPE_NONE))) {
     185         [ #  # ]:          0 :                         if (package_index != ACPI_NOT_PACKAGE_ELEMENT) {
     186                 :          0 :                                 ACPI_WARN_PREDEFINED((AE_INFO,
     187                 :            :                                                       info->full_pathname,
     188                 :            :                                                       ACPI_WARN_ALWAYS,
     189                 :            :                                                       "Found unexpected NULL package element"));
     190                 :            : 
     191                 :          0 :                                 status =
     192                 :          0 :                                     acpi_ns_repair_null_element(info,
     193                 :            :                                                                 expected_btypes,
     194                 :            :                                                                 package_index,
     195                 :            :                                                                 return_object_ptr);
     196         [ #  # ]:          0 :                                 if (ACPI_SUCCESS(status)) {
     197                 :            :                                         return (AE_OK); /* Repair was successful */
     198                 :            :                                 }
     199                 :            :                         } else {
     200                 :          0 :                                 ACPI_WARN_PREDEFINED((AE_INFO,
     201                 :            :                                                       info->full_pathname,
     202                 :            :                                                       ACPI_WARN_ALWAYS,
     203                 :            :                                                       "Missing expected return value"));
     204                 :            :                         }
     205                 :            : 
     206                 :          0 :                         return (AE_AML_NO_RETURN_VALUE);
     207                 :            :                 }
     208                 :            :         }
     209                 :            : 
     210         [ #  # ]:          0 :         if (expected_btypes & ACPI_RTYPE_INTEGER) {
     211                 :          0 :                 status = acpi_ns_convert_to_integer(return_object, &new_object);
     212         [ #  # ]:          0 :                 if (ACPI_SUCCESS(status)) {
     213                 :          0 :                         goto object_repaired;
     214                 :            :                 }
     215                 :            :         }
     216         [ #  # ]:          0 :         if (expected_btypes & ACPI_RTYPE_STRING) {
     217                 :          0 :                 status = acpi_ns_convert_to_string(return_object, &new_object);
     218         [ #  # ]:          0 :                 if (ACPI_SUCCESS(status)) {
     219                 :          0 :                         goto object_repaired;
     220                 :            :                 }
     221                 :            :         }
     222         [ #  # ]:          0 :         if (expected_btypes & ACPI_RTYPE_BUFFER) {
     223                 :          0 :                 status = acpi_ns_convert_to_buffer(return_object, &new_object);
     224         [ #  # ]:          0 :                 if (ACPI_SUCCESS(status)) {
     225                 :          0 :                         goto object_repaired;
     226                 :            :                 }
     227                 :            :         }
     228         [ #  # ]:          0 :         if (expected_btypes & ACPI_RTYPE_PACKAGE) {
     229                 :            :                 /*
     230                 :            :                  * A package is expected. We will wrap the existing object with a
     231                 :            :                  * new package object. It is often the case that if a variable-length
     232                 :            :                  * package is required, but there is only a single object needed, the
     233                 :            :                  * BIOS will return that object instead of wrapping it with a Package
     234                 :            :                  * object. Note: after the wrapping, the package will be validated
     235                 :            :                  * for correct contents (expected object type or types).
     236                 :            :                  */
     237                 :          0 :                 status =
     238                 :          0 :                     acpi_ns_wrap_with_package(info, return_object, &new_object);
     239         [ #  # ]:          0 :                 if (ACPI_SUCCESS(status)) {
     240                 :            :                         /*
     241                 :            :                          * The original object just had its reference count
     242                 :            :                          * incremented for being inserted into the new package.
     243                 :            :                          */
     244                 :          0 :                         *return_object_ptr = new_object;        /* New Package object */
     245                 :          0 :                         info->return_flags |= ACPI_OBJECT_REPAIRED;
     246                 :          0 :                         return (AE_OK);
     247                 :            :                 }
     248                 :            :         }
     249                 :            : 
     250                 :            :         /* We cannot repair this object */
     251                 :            : 
     252                 :            :         return (AE_AML_OPERAND_TYPE);
     253                 :            : 
     254                 :          0 : object_repaired:
     255                 :            : 
     256                 :            :         /* Object was successfully repaired */
     257                 :            : 
     258         [ #  # ]:          0 :         if (package_index != ACPI_NOT_PACKAGE_ELEMENT) {
     259                 :            : 
     260                 :            :                 /* Update reference count of new object */
     261                 :            : 
     262         [ #  # ]:          0 :                 if (!(info->return_flags & ACPI_OBJECT_WRAPPED)) {
     263                 :          0 :                         new_object->common.reference_count =
     264                 :          0 :                             return_object->common.reference_count;
     265                 :            :                 }
     266                 :            : 
     267                 :            :                 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
     268                 :            :                                   "%s: Converted %s to expected %s at Package index %u\n",
     269                 :            :                                   info->full_pathname,
     270                 :            :                                   acpi_ut_get_object_type_name(return_object),
     271                 :            :                                   acpi_ut_get_object_type_name(new_object),
     272                 :            :                                   package_index));
     273                 :            :         } else {
     274                 :            :                 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
     275                 :            :                                   "%s: Converted %s to expected %s\n",
     276                 :            :                                   info->full_pathname,
     277                 :            :                                   acpi_ut_get_object_type_name(return_object),
     278                 :          0 :                                   acpi_ut_get_object_type_name(new_object)));
     279                 :            :         }
     280                 :            : 
     281                 :            :         /* Delete old object, install the new return object */
     282                 :            : 
     283                 :          0 :         acpi_ut_remove_reference(return_object);
     284                 :          0 :         *return_object_ptr = new_object;
     285                 :          0 :         info->return_flags |= ACPI_OBJECT_REPAIRED;
     286                 :          0 :         return (AE_OK);
     287                 :            : }
     288                 :            : 
     289                 :            : /******************************************************************************
     290                 :            :  *
     291                 :            :  * FUNCTION:    acpi_ns_match_simple_repair
     292                 :            :  *
     293                 :            :  * PARAMETERS:  node                - Namespace node for the method/object
     294                 :            :  *              return_btype        - Object type that was returned
     295                 :            :  *              package_index       - Index of object within parent package (if
     296                 :            :  *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
     297                 :            :  *                                    otherwise)
     298                 :            :  *
     299                 :            :  * RETURN:      Pointer to entry in repair table. NULL indicates not found.
     300                 :            :  *
     301                 :            :  * DESCRIPTION: Check an object name against the repairable object list.
     302                 :            :  *
     303                 :            :  *****************************************************************************/
     304                 :            : 
     305                 :       3381 : static const struct acpi_simple_repair_info *acpi_ns_match_simple_repair(struct
     306                 :            :                                                                          acpi_namespace_node
     307                 :            :                                                                          *node,
     308                 :            :                                                                          u32
     309                 :            :                                                                          return_btype,
     310                 :            :                                                                          u32
     311                 :            :                                                                          package_index)
     312                 :            : {
     313                 :       3381 :         const struct acpi_simple_repair_info *this_name;
     314                 :            : 
     315                 :            :         /* Search info table for a repairable predefined method/object name */
     316                 :            : 
     317                 :       3381 :         this_name = acpi_object_repair_info;
     318         [ +  + ]:      22977 :         while (this_name->object_converter) {
     319         [ +  + ]:      19716 :                 if (ACPI_COMPARE_NAMESEG(node->name.ascii, this_name->name)) {
     320                 :            : 
     321                 :            :                         /* Check if we can actually repair this name/type combination */
     322                 :            : 
     323         [ +  - ]:        120 :                         if ((return_btype & this_name->unexpected_btypes) &&
     324         [ +  - ]:        120 :                             (this_name->package_index ==
     325                 :            :                              ACPI_ALL_PACKAGE_ELEMENTS
     326         [ -  + ]:        120 :                              || package_index == this_name->package_index)) {
     327                 :            :                                 return (this_name);
     328                 :            :                         }
     329                 :            : 
     330                 :          0 :                         return (NULL);
     331                 :            :                 }
     332                 :            : 
     333                 :      19596 :                 this_name++;
     334                 :            :         }
     335                 :            : 
     336                 :            :         return (NULL);          /* Name was not found in the repair table */
     337                 :            : }
     338                 :            : 
     339                 :            : /*******************************************************************************
     340                 :            :  *
     341                 :            :  * FUNCTION:    acpi_ns_repair_null_element
     342                 :            :  *
     343                 :            :  * PARAMETERS:  info                - Method execution information block
     344                 :            :  *              expected_btypes     - Object types expected
     345                 :            :  *              package_index       - Index of object within parent package (if
     346                 :            :  *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
     347                 :            :  *                                    otherwise)
     348                 :            :  *              return_object_ptr   - Pointer to the object returned from the
     349                 :            :  *                                    evaluation of a method or object
     350                 :            :  *
     351                 :            :  * RETURN:      Status. AE_OK if repair was successful.
     352                 :            :  *
     353                 :            :  * DESCRIPTION: Attempt to repair a NULL element of a returned Package object.
     354                 :            :  *
     355                 :            :  ******************************************************************************/
     356                 :            : 
     357                 :            : acpi_status
     358                 :          0 : acpi_ns_repair_null_element(struct acpi_evaluate_info *info,
     359                 :            :                             u32 expected_btypes,
     360                 :            :                             u32 package_index,
     361                 :            :                             union acpi_operand_object **return_object_ptr)
     362                 :            : {
     363                 :          0 :         union acpi_operand_object *return_object = *return_object_ptr;
     364                 :          0 :         union acpi_operand_object *new_object;
     365                 :            : 
     366                 :          0 :         ACPI_FUNCTION_NAME(ns_repair_null_element);
     367                 :            : 
     368                 :            :         /* No repair needed if return object is non-NULL */
     369                 :            : 
     370         [ #  # ]:          0 :         if (return_object) {
     371                 :            :                 return (AE_OK);
     372                 :            :         }
     373                 :            : 
     374                 :            :         /*
     375                 :            :          * Attempt to repair a NULL element of a Package object. This applies to
     376                 :            :          * predefined names that return a fixed-length package and each element
     377                 :            :          * is required. It does not apply to variable-length packages where NULL
     378                 :            :          * elements are allowed, especially at the end of the package.
     379                 :            :          */
     380         [ #  # ]:          0 :         if (expected_btypes & ACPI_RTYPE_INTEGER) {
     381                 :            : 
     382                 :            :                 /* Need an integer - create a zero-value integer */
     383                 :            : 
     384                 :          0 :                 new_object = acpi_ut_create_integer_object((u64)0);
     385         [ #  # ]:          0 :         } else if (expected_btypes & ACPI_RTYPE_STRING) {
     386                 :            : 
     387                 :            :                 /* Need a string - create a NULL string */
     388                 :            : 
     389                 :          0 :                 new_object = acpi_ut_create_string_object(0);
     390         [ #  # ]:          0 :         } else if (expected_btypes & ACPI_RTYPE_BUFFER) {
     391                 :            : 
     392                 :            :                 /* Need a buffer - create a zero-length buffer */
     393                 :            : 
     394                 :          0 :                 new_object = acpi_ut_create_buffer_object(0);
     395                 :            :         } else {
     396                 :            :                 /* Error for all other expected types */
     397                 :            : 
     398                 :            :                 return (AE_AML_OPERAND_TYPE);
     399                 :            :         }
     400                 :            : 
     401         [ #  # ]:          0 :         if (!new_object) {
     402                 :            :                 return (AE_NO_MEMORY);
     403                 :            :         }
     404                 :            : 
     405                 :            :         /* Set the reference count according to the parent Package object */
     406                 :            : 
     407                 :          0 :         new_object->common.reference_count =
     408                 :          0 :             info->parent_package->common.reference_count;
     409                 :            : 
     410                 :            :         ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
     411                 :            :                           "%s: Converted NULL package element to expected %s at index %u\n",
     412                 :            :                           info->full_pathname,
     413                 :            :                           acpi_ut_get_object_type_name(new_object),
     414                 :          0 :                           package_index));
     415                 :            : 
     416                 :          0 :         *return_object_ptr = new_object;
     417                 :          0 :         info->return_flags |= ACPI_OBJECT_REPAIRED;
     418                 :          0 :         return (AE_OK);
     419                 :            : }
     420                 :            : 
     421                 :            : /******************************************************************************
     422                 :            :  *
     423                 :            :  * FUNCTION:    acpi_ns_remove_null_elements
     424                 :            :  *
     425                 :            :  * PARAMETERS:  info                - Method execution information block
     426                 :            :  *              package_type        - An acpi_return_package_types value
     427                 :            :  *              obj_desc            - A Package object
     428                 :            :  *
     429                 :            :  * RETURN:      None.
     430                 :            :  *
     431                 :            :  * DESCRIPTION: Remove all NULL package elements from packages that contain
     432                 :            :  *              a variable number of subpackages. For these types of
     433                 :            :  *              packages, NULL elements can be safely removed.
     434                 :            :  *
     435                 :            :  *****************************************************************************/
     436                 :            : 
     437                 :            : void
     438                 :         12 : acpi_ns_remove_null_elements(struct acpi_evaluate_info *info,
     439                 :            :                              u8 package_type,
     440                 :            :                              union acpi_operand_object *obj_desc)
     441                 :            : {
     442                 :         12 :         union acpi_operand_object **source;
     443                 :         12 :         union acpi_operand_object **dest;
     444                 :         12 :         u32 count;
     445                 :         12 :         u32 new_count;
     446                 :         12 :         u32 i;
     447                 :            : 
     448                 :         12 :         ACPI_FUNCTION_NAME(ns_remove_null_elements);
     449                 :            : 
     450                 :            :         /*
     451                 :            :          * We can safely remove all NULL elements from these package types:
     452                 :            :          * PTYPE1_VAR packages contain a variable number of simple data types.
     453                 :            :          * PTYPE2 packages contain a variable number of subpackages.
     454                 :            :          */
     455         [ +  - ]:         12 :         switch (package_type) {
     456                 :            :         case ACPI_PTYPE1_VAR:
     457                 :            :         case ACPI_PTYPE2:
     458                 :            :         case ACPI_PTYPE2_COUNT:
     459                 :            :         case ACPI_PTYPE2_PKG_COUNT:
     460                 :            :         case ACPI_PTYPE2_FIXED:
     461                 :            :         case ACPI_PTYPE2_MIN:
     462                 :            :         case ACPI_PTYPE2_REV_FIXED:
     463                 :            :         case ACPI_PTYPE2_FIX_VAR:
     464                 :         12 :                 break;
     465                 :            : 
     466                 :            :         default:
     467                 :            :         case ACPI_PTYPE2_VAR_VAR:
     468                 :            :         case ACPI_PTYPE1_FIXED:
     469                 :            :         case ACPI_PTYPE1_OPTION:
     470                 :            :                 return;
     471                 :            :         }
     472                 :            : 
     473                 :         12 :         count = obj_desc->package.count;
     474                 :         12 :         new_count = count;
     475                 :            : 
     476                 :         12 :         source = obj_desc->package.elements;
     477                 :         12 :         dest = source;
     478                 :            : 
     479                 :            :         /* Examine all elements of the package object, remove nulls */
     480                 :            : 
     481         [ +  + ]:        432 :         for (i = 0; i < count; i++) {
     482         [ -  + ]:        420 :                 if (!*source) {
     483                 :          0 :                         new_count--;
     484                 :            :                 } else {
     485                 :        420 :                         *dest = *source;
     486                 :        420 :                         dest++;
     487                 :            :                 }
     488                 :            : 
     489                 :        420 :                 source++;
     490                 :            :         }
     491                 :            : 
     492                 :            :         /* Update parent package if any null elements were removed */
     493                 :            : 
     494         [ -  + ]:         12 :         if (new_count < count) {
     495                 :            :                 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
     496                 :            :                                   "%s: Found and removed %u NULL elements\n",
     497                 :          0 :                                   info->full_pathname, (count - new_count)));
     498                 :            : 
     499                 :            :                 /* NULL terminate list and update the package count */
     500                 :            : 
     501                 :          0 :                 *dest = NULL;
     502                 :          0 :                 obj_desc->package.count = new_count;
     503                 :            :         }
     504                 :            : }
     505                 :            : 
     506                 :            : /*******************************************************************************
     507                 :            :  *
     508                 :            :  * FUNCTION:    acpi_ns_wrap_with_package
     509                 :            :  *
     510                 :            :  * PARAMETERS:  info                - Method execution information block
     511                 :            :  *              original_object     - Pointer to the object to repair.
     512                 :            :  *              obj_desc_ptr        - The new package object is returned here
     513                 :            :  *
     514                 :            :  * RETURN:      Status, new object in *obj_desc_ptr
     515                 :            :  *
     516                 :            :  * DESCRIPTION: Repair a common problem with objects that are defined to
     517                 :            :  *              return a variable-length Package of sub-objects. If there is
     518                 :            :  *              only one sub-object, some BIOS code mistakenly simply declares
     519                 :            :  *              the single object instead of a Package with one sub-object.
     520                 :            :  *              This function attempts to repair this error by wrapping a
     521                 :            :  *              Package object around the original object, creating the
     522                 :            :  *              correct and expected Package with one sub-object.
     523                 :            :  *
     524                 :            :  *              Names that can be repaired in this manner include:
     525                 :            :  *              _ALR, _CSD, _HPX, _MLS, _PLD, _PRT, _PSS, _TRT, _TSS,
     526                 :            :  *              _BCL, _DOD, _FIX, _Sx
     527                 :            :  *
     528                 :            :  ******************************************************************************/
     529                 :            : 
     530                 :            : acpi_status
     531                 :          0 : acpi_ns_wrap_with_package(struct acpi_evaluate_info *info,
     532                 :            :                           union acpi_operand_object *original_object,
     533                 :            :                           union acpi_operand_object **obj_desc_ptr)
     534                 :            : {
     535                 :          0 :         union acpi_operand_object *pkg_obj_desc;
     536                 :            : 
     537                 :          0 :         ACPI_FUNCTION_NAME(ns_wrap_with_package);
     538                 :            : 
     539                 :            :         /*
     540                 :            :          * Create the new outer package and populate it. The new
     541                 :            :          * package will have a single element, the lone sub-object.
     542                 :            :          */
     543                 :          0 :         pkg_obj_desc = acpi_ut_create_package_object(1);
     544         [ #  # ]:          0 :         if (!pkg_obj_desc) {
     545                 :            :                 return (AE_NO_MEMORY);
     546                 :            :         }
     547                 :            : 
     548                 :          0 :         pkg_obj_desc->package.elements[0] = original_object;
     549                 :            : 
     550                 :            :         ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
     551                 :            :                           "%s: Wrapped %s with expected Package object\n",
     552                 :            :                           info->full_pathname,
     553                 :          0 :                           acpi_ut_get_object_type_name(original_object)));
     554                 :            : 
     555                 :            :         /* Return the new object in the object pointer */
     556                 :            : 
     557                 :          0 :         *obj_desc_ptr = pkg_obj_desc;
     558                 :          0 :         info->return_flags |= ACPI_OBJECT_REPAIRED | ACPI_OBJECT_WRAPPED;
     559                 :          0 :         return (AE_OK);
     560                 :            : }

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