drivers/acpi/acpica/nsrepair.c

   1 /******************************************************************************
   2  *
   3  * Module Name: nsrepair - Repair for objects returned by predefined methods
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2010, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acnamesp.h"
  47 #include "acinterp.h"
  48 #include "acpredef.h"
  49
  50 #define _COMPONENT          ACPI_NAMESPACE
  51 ACPI_MODULE_NAME("nsrepair")
  52
  53 /*******************************************************************************
  54  *
  55  * This module attempts to repair or convert objects returned by the
  56  * predefined methods to an object type that is expected, as per the ACPI
  57  * specification. The need for this code is dictated by the many machines that
  58  * return incorrect types for the standard predefined methods. Performing these
  59  * conversions here, in one place, eliminates the need for individual ACPI
  60  * device drivers to do the same. Note: Most of these conversions are different
  61  * than the internal object conversion routines used for implicit object
  62  * conversion.
  63  *
  64  * The following conversions can be performed as necessary:
  65  *
  66  * Integer -> String
  67  * Integer -> Buffer
  68  * String  -> Integer
  69  * String  -> Buffer
  70  * Buffer  -> Integer
  71  * Buffer  -> String
  72  * Buffer  -> Package of Integers
  73  * Package -> Package of one Package
  74  *
  75  * Additional possible repairs:
  76  *
  77  * Optional/unnecessary NULL package elements removed
  78  * Required package elements that are NULL replaced by Integer/String/Buffer
  79  * Incorrect standalone package wrapped with required outer package
  80  *
  81  ******************************************************************************/
  82 /* Local prototypes */
  83 static acpi_status
  84 acpi_ns_convert_to_integer(union acpi_operand_object *original_object,
  85                            union acpi_operand_object **return_object);
  86
  87 static acpi_status
  88 acpi_ns_convert_to_string(union acpi_operand_object *original_object,
  89                           union acpi_operand_object **return_object);
  90
  91 static acpi_status
  92 acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
  93                           union acpi_operand_object **return_object);
  94
  95 static acpi_status
  96 acpi_ns_convert_to_package(union acpi_operand_object *original_object,
  97                            union acpi_operand_object **return_object);
  98
  99 /*******************************************************************************
 100  *
 101  * FUNCTION:    acpi_ns_repair_object
 102  *
 103  * PARAMETERS:  Data                - Pointer to validation data structure
 104  *              expected_btypes     - Object types expected
 105  *              package_index       - Index of object within parent package (if
 106  *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
 107  *                                    otherwise)
 108  *              return_object_ptr   - Pointer to the object returned from the
 109  *                                    evaluation of a method or object
 110  *
 111  * RETURN:      Status. AE_OK if repair was successful.
 112  *
 113  * DESCRIPTION: Attempt to repair/convert a return object of a type that was
 114  *              not expected.
 115  *
 116  ******************************************************************************/
 117
 118 acpi_status
 119 acpi_ns_repair_object(struct acpi_predefined_data *data,
 120                       u32 expected_btypes,
 121                       u32 package_index,
 122                       union acpi_operand_object **return_object_ptr)
 123 {
 124         union acpi_operand_object *return_object = *return_object_ptr;
 125         union acpi_operand_object *new_object;
 126         acpi_status status;
 127
 128         ACPI_FUNCTION_NAME(ns_repair_object);
 129
 130         /*
 131          * At this point, we know that the type of the returned object was not
 132          * one of the expected types for this predefined name. Attempt to
 133          * repair the object by converting it to one of the expected object
 134          * types for this predefined name.
 135          */
 136         if (expected_btypes & ACPI_RTYPE_INTEGER) {
 137                 status = acpi_ns_convert_to_integer(return_object, &new_object);
 138                 if (ACPI_SUCCESS(status)) {
 139                         goto object_repaired;
 140                 }
 141         }
 142         if (expected_btypes & ACPI_RTYPE_STRING) {
 143                 status = acpi_ns_convert_to_string(return_object, &new_object);
 144                 if (ACPI_SUCCESS(status)) {
 145                         goto object_repaired;
 146                 }
 147         }
 148         if (expected_btypes & ACPI_RTYPE_BUFFER) {
 149                 status = acpi_ns_convert_to_buffer(return_object, &new_object);
 150                 if (ACPI_SUCCESS(status)) {
 151                         goto object_repaired;
 152                 }
 153         }
 154         if (expected_btypes & ACPI_RTYPE_PACKAGE) {
 155                 status = acpi_ns_convert_to_package(return_object, &new_object);
 156                 if (ACPI_SUCCESS(status)) {
 157                         goto object_repaired;
 158                 }
 159         }
 160
 161         /* We cannot repair this object */
 162
 163         return (AE_AML_OPERAND_TYPE);
 164
 165       object_repaired:
 166
 167         /* Object was successfully repaired */
 168
 169         /*
 170          * If the original object is a package element, we need to:
 171          * 1. Set the reference count of the new object to match the
 172          *    reference count of the old object.
 173          * 2. Decrement the reference count of the original object.
 174          */
 175         if (package_index != ACPI_NOT_PACKAGE_ELEMENT) {
 176                 new_object->common.reference_count =
 177                     return_object->common.reference_count;
 178
 179                 if (return_object->common.reference_count > 1) {
 180                         return_object->common.reference_count--;
 181                 }
 182
 183                 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 184                                   "%s: Converted %s to expected %s at index %u\n",
 185                                   data->pathname,
 186                                   acpi_ut_get_object_type_name(return_object),
 187                                   acpi_ut_get_object_type_name(new_object),
 188                                   package_index));
 189         } else {
 190                 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 191                                   "%s: Converted %s to expected %s\n",
 192                                   data->pathname,
 193                                   acpi_ut_get_object_type_name(return_object),
 194                                   acpi_ut_get_object_type_name(new_object)));
 195         }
 196
 197         /* Delete old object, install the new return object */
 198
 199         acpi_ut_remove_reference(return_object);
 200         *return_object_ptr = new_object;
 201         data->flags |= ACPI_OBJECT_REPAIRED;
 202         return (AE_OK);
 203 }
 204
 205 /*******************************************************************************
 206  *
 207  * FUNCTION:    acpi_ns_convert_to_integer
 208  *
 209  * PARAMETERS:  original_object     - Object to be converted
 210  *              return_object       - Where the new converted object is returned
 211  *
 212  * RETURN:      Status. AE_OK if conversion was successful.
 213  *
 214  * DESCRIPTION: Attempt to convert a String/Buffer object to an Integer.
 215  *
 216  ******************************************************************************/
 217
 218 static acpi_status
 219 acpi_ns_convert_to_integer(union acpi_operand_object *original_object,
 220                            union acpi_operand_object **return_object)
 221 {
 222         union acpi_operand_object *new_object;
 223         acpi_status status;
 224         u64 value = 0;
 225         u32 i;
 226
 227         switch (original_object->common.type) {
 228         case ACPI_TYPE_STRING:
 229
 230                 /* String-to-Integer conversion */
 231
 232                 status = acpi_ut_strtoul64(original_object->string.pointer,
 233                                            ACPI_ANY_BASE, &value);
 234                 if (ACPI_FAILURE(status)) {
 235                         return (status);
 236                 }
 237                 break;
 238
 239         case ACPI_TYPE_BUFFER:
 240
 241                 /* Buffer-to-Integer conversion. Max buffer size is 64 bits. */
 242
 243                 if (original_object->buffer.length > 8) {
 244                         return (AE_AML_OPERAND_TYPE);
 245                 }
 246
 247                 /* Extract each buffer byte to create the integer */
 248
 249                 for (i = 0; i < original_object->buffer.length; i++) {
 250                         value |=
 251                             ((u64) original_object->buffer.
 252                              pointer[i] << (i * 8));
 253                 }
 254                 break;
 255
 256         default:
 257                 return (AE_AML_OPERAND_TYPE);
 258         }
 259
 260         new_object = acpi_ut_create_integer_object(value);
 261         if (!new_object) {
 262                 return (AE_NO_MEMORY);
 263         }
 264
 265         *return_object = new_object;
 266         return (AE_OK);
 267 }
 268
 269 /*******************************************************************************
 270  *
 271  * FUNCTION:    acpi_ns_convert_to_string
 272  *
 273  * PARAMETERS:  original_object     - Object to be converted
 274  *              return_object       - Where the new converted object is returned
 275  *
 276  * RETURN:      Status. AE_OK if conversion was successful.
 277  *
 278  * DESCRIPTION: Attempt to convert a Integer/Buffer object to a String.
 279  *
 280  ******************************************************************************/
 281
 282 static acpi_status
 283 acpi_ns_convert_to_string(union acpi_operand_object *original_object,
 284                           union acpi_operand_object **return_object)
 285 {
 286         union acpi_operand_object *new_object;
 287         acpi_size length;
 288         acpi_status status;
 289
 290         switch (original_object->common.type) {
 291         case ACPI_TYPE_INTEGER:
 292                 /*
 293                  * Integer-to-String conversion. Commonly, convert
 294                  * an integer of value 0 to a NULL string. The last element of
 295                  * _BIF and _BIX packages occasionally need this fix.
 296                  */
 297                 if (original_object->integer.value == 0) {
 298
 299                         /* Allocate a new NULL string object */
 300
 301                         new_object = acpi_ut_create_string_object(0);
 302                         if (!new_object) {
 303                                 return (AE_NO_MEMORY);
 304                         }
 305                 } else {
 306                         status =
 307                             acpi_ex_convert_to_string(original_object,
 308                                                       &new_object,
 309                                                       ACPI_IMPLICIT_CONVERT_HEX);
 310                         if (ACPI_FAILURE(status)) {
 311                                 return (status);
 312                         }
 313                 }
 314                 break;
 315
 316         case ACPI_TYPE_BUFFER:
 317                 /*
 318                  * Buffer-to-String conversion. Use a to_string
 319                  * conversion, no transform performed on the buffer data. The best
 320                  * example of this is the _BIF method, where the string data from
 321                  * the battery is often (incorrectly) returned as buffer object(s).
 322                  */
 323                 length = 0;
 324                 while ((length < original_object->buffer.length) &&
 325                        (original_object->buffer.pointer[length])) {
 326                         length++;
 327                 }
 328
 329                 /* Allocate a new string object */
 330
 331                 new_object = acpi_ut_create_string_object(length);
 332                 if (!new_object) {
 333                         return (AE_NO_MEMORY);
 334                 }
 335
 336                 /*
 337                  * Copy the raw buffer data with no transform. String is already NULL
 338                  * terminated at Length+1.
 339                  */
 340                 ACPI_MEMCPY(new_object->string.pointer,
 341                             original_object->buffer.pointer, length);
 342                 break;
 343
 344         default:
 345                 return (AE_AML_OPERAND_TYPE);
 346         }
 347
 348         *return_object = new_object;
 349         return (AE_OK);
 350 }
 351
 352 /*******************************************************************************
 353  *
 354  * FUNCTION:    acpi_ns_convert_to_buffer
 355  *
 356  * PARAMETERS:  original_object     - Object to be converted
 357  *              return_object       - Where the new converted object is returned
 358  *
 359  * RETURN:      Status. AE_OK if conversion was successful.
 360  *
 361  * DESCRIPTION: Attempt to convert a Integer/String/Package object to a Buffer.
 362  *
 363  ******************************************************************************/
 364
 365 static acpi_status
 366 acpi_ns_convert_to_buffer(union acpi_operand_object *original_object,
 367                           union acpi_operand_object **return_object)
 368 {
 369         union acpi_operand_object *new_object;
 370         acpi_status status;
 371         union acpi_operand_object **elements;
 372         u32 *dword_buffer;
 373         u32 count;
 374         u32 i;
 375
 376         switch (original_object->common.type) {
 377         case ACPI_TYPE_INTEGER:
 378                 /*
 379                  * Integer-to-Buffer conversion.
 380                  * Convert the Integer to a packed-byte buffer. _MAT and other
 381                  * objects need this sometimes, if a read has been performed on a
 382                  * Field object that is less than or equal to the global integer
 383                  * size (32 or 64 bits).
 384                  */
 385                 status =
 386                     acpi_ex_convert_to_buffer(original_object, &new_object);
 387                 if (ACPI_FAILURE(status)) {
 388                         return (status);
 389                 }
 390                 break;
 391
 392         case ACPI_TYPE_STRING:
 393
 394                 /* String-to-Buffer conversion. Simple data copy */
 395
 396                 new_object =
 397                     acpi_ut_create_buffer_object(original_object->string.
 398                                                  length);
 399                 if (!new_object) {
 400                         return (AE_NO_MEMORY);
 401                 }
 402
 403                 ACPI_MEMCPY(new_object->buffer.pointer,
 404                             original_object->string.pointer,
 405                             original_object->string.length);
 406                 break;
 407
 408         case ACPI_TYPE_PACKAGE:
 409                 /*
 410                  * This case is often seen for predefined names that must return a
 411                  * Buffer object with multiple DWORD integers within. For example,
 412                  * _FDE and _GTM. The Package can be converted to a Buffer.
 413                  */
 414
 415                 /* All elements of the Package must be integers */
 416
 417                 elements = original_object->package.elements;
 418                 count = original_object->package.count;
 419
 420                 for (i = 0; i < count; i++) {
 421                         if ((!*elements) ||
 422                             ((*elements)->common.type != ACPI_TYPE_INTEGER)) {
 423                                 return (AE_AML_OPERAND_TYPE);
 424                         }
 425                         elements++;
 426                 }
 427
 428                 /* Create the new buffer object to replace the Package */
 429
 430                 new_object = acpi_ut_create_buffer_object(ACPI_MUL_4(count));
 431                 if (!new_object) {
 432                         return (AE_NO_MEMORY);
 433                 }
 434
 435                 /* Copy the package elements (integers) to the buffer as DWORDs */
 436
 437                 elements = original_object->package.elements;
 438                 dword_buffer = ACPI_CAST_PTR(u32, new_object->buffer.pointer);
 439
 440                 for (i = 0; i < count; i++) {
 441                         *dword_buffer = (u32) (*elements)->integer.value;
 442                         dword_buffer++;
 443                         elements++;
 444                 }
 445                 break;
 446
 447         default:
 448                 return (AE_AML_OPERAND_TYPE);
 449         }
 450
 451         *return_object = new_object;
 452         return (AE_OK);
 453 }
 454
 455 /*******************************************************************************
 456  *
 457  * FUNCTION:    acpi_ns_convert_to_package
 458  *
 459  * PARAMETERS:  original_object     - Object to be converted
 460  *              return_object       - Where the new converted object is returned
 461  *
 462  * RETURN:      Status. AE_OK if conversion was successful.
 463  *
 464  * DESCRIPTION: Attempt to convert a Buffer object to a Package. Each byte of
 465  *              the buffer is converted to a single integer package element.
 466  *
 467  ******************************************************************************/
 468
 469 static acpi_status
 470 acpi_ns_convert_to_package(union acpi_operand_object *original_object,
 471                            union acpi_operand_object **return_object)
 472 {
 473         union acpi_operand_object *new_object;
 474         union acpi_operand_object **elements;
 475         u32 length;
 476         u8 *buffer;
 477
 478         switch (original_object->common.type) {
 479         case ACPI_TYPE_BUFFER:
 480
 481                 /* Buffer-to-Package conversion */
 482
 483                 length = original_object->buffer.length;
 484                 new_object = acpi_ut_create_package_object(length);
 485                 if (!new_object) {
 486                         return (AE_NO_MEMORY);
 487                 }
 488
 489                 /* Convert each buffer byte to an integer package element */
 490
 491                 elements = new_object->package.elements;
 492                 buffer = original_object->buffer.pointer;
 493
 494                 while (length--) {
 495                         *elements =
 496                             acpi_ut_create_integer_object((u64) *buffer);
 497                         if (!*elements) {
 498                                 acpi_ut_remove_reference(new_object);
 499                                 return (AE_NO_MEMORY);
 500                         }
 501                         elements++;
 502                         buffer++;
 503                 }
 504                 break;
 505
 506         default:
 507                 return (AE_AML_OPERAND_TYPE);
 508         }
 509
 510         *return_object = new_object;
 511         return (AE_OK);
 512 }
 513
 514 /*******************************************************************************
 515  *
 516  * FUNCTION:    acpi_ns_repair_null_element
 517  *
 518  * PARAMETERS:  Data                - Pointer to validation data structure
 519  *              expected_btypes     - Object types expected
 520  *              package_index       - Index of object within parent package (if
 521  *                                    applicable - ACPI_NOT_PACKAGE_ELEMENT
 522  *                                    otherwise)
 523  *              return_object_ptr   - Pointer to the object returned from the
 524  *                                    evaluation of a method or object
 525  *
 526  * RETURN:      Status. AE_OK if repair was successful.
 527  *
 528  * DESCRIPTION: Attempt to repair a NULL element of a returned Package object.
 529  *
 530  ******************************************************************************/
 531
 532 acpi_status
 533 acpi_ns_repair_null_element(struct acpi_predefined_data *data,
 534                             u32 expected_btypes,
 535                             u32 package_index,
 536                             union acpi_operand_object **return_object_ptr)
 537 {
 538         union acpi_operand_object *return_object = *return_object_ptr;
 539         union acpi_operand_object *new_object;
 540
 541         ACPI_FUNCTION_NAME(ns_repair_null_element);
 542
 543         /* No repair needed if return object is non-NULL */
 544
 545         if (return_object) {
 546                 return (AE_OK);
 547         }
 548
 549         /*
 550          * Attempt to repair a NULL element of a Package object. This applies to
 551          * predefined names that return a fixed-length package and each element
 552          * is required. It does not apply to variable-length packages where NULL
 553          * elements are allowed, especially at the end of the package.
 554          */
 555         if (expected_btypes & ACPI_RTYPE_INTEGER) {
 556
 557                 /* Need an Integer - create a zero-value integer */
 558
 559                 new_object = acpi_ut_create_integer_object((u64)0);
 560         } else if (expected_btypes & ACPI_RTYPE_STRING) {
 561
 562                 /* Need a String - create a NULL string */
 563
 564                 new_object = acpi_ut_create_string_object(0);
 565         } else if (expected_btypes & ACPI_RTYPE_BUFFER) {
 566
 567                 /* Need a Buffer - create a zero-length buffer */
 568
 569                 new_object = acpi_ut_create_buffer_object(0);
 570         } else {
 571                 /* Error for all other expected types */
 572
 573                 return (AE_AML_OPERAND_TYPE);
 574         }
 575
 576         if (!new_object) {
 577                 return (AE_NO_MEMORY);
 578         }
 579
 580         /* Set the reference count according to the parent Package object */
 581
 582         new_object->common.reference_count =
 583             data->parent_package->common.reference_count;
 584
 585         ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 586                           "%s: Converted NULL package element to expected %s at index %u\n",
 587                           data->pathname,
 588                           acpi_ut_get_object_type_name(new_object),
 589                           package_index));
 590
 591         *return_object_ptr = new_object;
 592         data->flags |= ACPI_OBJECT_REPAIRED;
 593         return (AE_OK);
 594 }
 595
 596 /******************************************************************************
 597  *
 598  * FUNCTION:    acpi_ns_remove_null_elements
 599  *
 600  * PARAMETERS:  Data                - Pointer to validation data structure
 601  *              package_type        - An acpi_return_package_types value
 602  *              obj_desc            - A Package object
 603  *
 604  * RETURN:      None.
 605  *
 606  * DESCRIPTION: Remove all NULL package elements from packages that contain
 607  *              a variable number of sub-packages. For these types of
 608  *              packages, NULL elements can be safely removed.
 609  *
 610  *****************************************************************************/
 611
 612 void
 613 acpi_ns_remove_null_elements(struct acpi_predefined_data *data,
 614                              u8 package_type,
 615                              union acpi_operand_object *obj_desc)
 616 {
 617         union acpi_operand_object **source;
 618         union acpi_operand_object **dest;
 619         u32 count;
 620         u32 new_count;
 621         u32 i;
 622
 623         ACPI_FUNCTION_NAME(ns_remove_null_elements);
 624
 625         /*
 626          * PTYPE1 packages contain no subpackages.
 627          * PTYPE2 packages contain a variable number of sub-packages. We can
 628          * safely remove all NULL elements from the PTYPE2 packages.
 629          */
 630         switch (package_type) {
 631         case ACPI_PTYPE1_FIXED:
 632         case ACPI_PTYPE1_VAR:
 633         case ACPI_PTYPE1_OPTION:
 634                 return;
 635
 636         case ACPI_PTYPE2:
 637         case ACPI_PTYPE2_COUNT:
 638         case ACPI_PTYPE2_PKG_COUNT:
 639         case ACPI_PTYPE2_FIXED:
 640         case ACPI_PTYPE2_MIN:
 641         case ACPI_PTYPE2_REV_FIXED:
 642                 break;
 643
 644         default:
 645                 return;
 646         }
 647
 648         count = obj_desc->package.count;
 649         new_count = count;
 650
 651         source = obj_desc->package.elements;
 652         dest = source;
 653
 654         /* Examine all elements of the package object, remove nulls */
 655
 656         for (i = 0; i < count; i++) {
 657                 if (!*source) {
 658                         new_count--;
 659                 } else {
 660                         *dest = *source;
 661                         dest++;
 662                 }
 663                 source++;
 664         }
 665
 666         /* Update parent package if any null elements were removed */
 667
 668         if (new_count < count) {
 669                 ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 670                                   "%s: Found and removed %u NULL elements\n",
 671                                   data->pathname, (count - new_count)));
 672
 673                 /* NULL terminate list and update the package count */
 674
 675                 *dest = NULL;
 676                 obj_desc->package.count = new_count;
 677         }
 678 }
 679
 680 /*******************************************************************************
 681  *
 682  * FUNCTION:    acpi_ns_repair_package_list
 683  *
 684  * PARAMETERS:  Data                - Pointer to validation data structure
 685  *              obj_desc_ptr        - Pointer to the object to repair. The new
 686  *                                    package object is returned here,
 687  *                                    overwriting the old object.
 688  *
 689  * RETURN:      Status, new object in *obj_desc_ptr
 690  *
 691  * DESCRIPTION: Repair a common problem with objects that are defined to return
 692  *              a variable-length Package of Packages. If the variable-length
 693  *              is one, some BIOS code mistakenly simply declares a single
 694  *              Package instead of a Package with one sub-Package. This
 695  *              function attempts to repair this error by wrapping a Package
 696  *              object around the original Package, creating the correct
 697  *              Package with one sub-Package.
 698  *
 699  *              Names that can be repaired in this manner include:
 700  *              _ALR, _CSD, _HPX, _MLS, _PRT, _PSS, _TRT, TSS
 701  *
 702  ******************************************************************************/
 703
 704 acpi_status
 705 acpi_ns_repair_package_list(struct acpi_predefined_data *data,
 706                             union acpi_operand_object **obj_desc_ptr)
 707 {
 708         union acpi_operand_object *pkg_obj_desc;
 709
 710         ACPI_FUNCTION_NAME(ns_repair_package_list);
 711
 712         /*
 713          * Create the new outer package and populate it. The new package will
 714          * have a single element, the lone subpackage.
 715          */
 716         pkg_obj_desc = acpi_ut_create_package_object(1);
 717         if (!pkg_obj_desc) {
 718                 return (AE_NO_MEMORY);
 719         }
 720
 721         pkg_obj_desc->package.elements[0] = *obj_desc_ptr;
 722
 723         /* Return the new object in the object pointer */
 724
 725         *obj_desc_ptr = pkg_obj_desc;
 726         data->flags |= ACPI_OBJECT_REPAIRED;
 727
 728         ACPI_DEBUG_PRINT((ACPI_DB_REPAIR,
 729                           "%s: Repaired incorrectly formed Package\n",
 730                           data->pathname));
 731
 732         return (AE_OK);
 733 }