drivers/acpi/acpica/evgpe.c

   1 /******************************************************************************
   2  *
   3  * Module Name: evgpe - General Purpose Event handling and dispatch
   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 "acevents.h"
  47 #include "acnamesp.h"
  48
  49 #define _COMPONENT          ACPI_EVENTS
  50 ACPI_MODULE_NAME("evgpe")
  51
  52 /* Local prototypes */
  53 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_ev_update_gpe_enable_masks
  58  *
  59  * PARAMETERS:  gpe_event_info          - GPE to update
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Updates GPE register enable masks based upon whether there are
  64  *              references (either wake or run) to this GPE
  65  *
  66  ******************************************************************************/
  67
  68 acpi_status
  69 acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info)
  70 {
  71         struct acpi_gpe_register_info *gpe_register_info;
  72         u32 register_bit;
  73
  74         ACPI_FUNCTION_TRACE(ev_update_gpe_enable_masks);
  75
  76         gpe_register_info = gpe_event_info->register_info;
  77         if (!gpe_register_info) {
  78                 return_ACPI_STATUS(AE_NOT_EXIST);
  79         }
  80
  81         register_bit = acpi_hw_gpe_register_bit(gpe_event_info,
  82                                                 gpe_register_info);
  83
  84         /* Clear the wake/run bits up front */
  85
  86         ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake, register_bit);
  87         ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
  88
  89         /* Set the mask bits only if there are references to this GPE */
  90
  91         if (gpe_event_info->runtime_count) {
  92                 ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
  93         }
  94
  95         if (gpe_event_info->wakeup_count) {
  96                 ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
  97         }
  98
  99         return_ACPI_STATUS(AE_OK);
 100 }
 101
 102 /*******************************************************************************
 103  *
 104  * FUNCTION:    acpi_ev_enable_gpe
 105  *
 106  * PARAMETERS:  gpe_event_info          - GPE to enable
 107  *
 108  * RETURN:      Status
 109  *
 110  * DESCRIPTION: Hardware-enable a GPE. Always enables the GPE, regardless
 111  *              of type or number of references.
 112  *
 113  * Note: The GPE lock should be already acquired when this function is called.
 114  *
 115  ******************************************************************************/
 116
 117 acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 118 {
 119         acpi_status status;
 120
 121
 122         ACPI_FUNCTION_TRACE(ev_enable_gpe);
 123
 124
 125         /*
 126          * We will only allow a GPE to be enabled if it has either an
 127          * associated method (_Lxx/_Exx) or a handler. Otherwise, the
 128          * GPE will be immediately disabled by acpi_ev_gpe_dispatch the
 129          * first time it fires.
 130          */
 131         if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)) {
 132                 return_ACPI_STATUS(AE_NO_HANDLER);
 133         }
 134
 135         /* Ensure the HW enable masks are current */
 136
 137         status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
 138         if (ACPI_FAILURE(status)) {
 139                 return_ACPI_STATUS(status);
 140         }
 141
 142         /* Clear the GPE (of stale events) */
 143
 144         status = acpi_hw_clear_gpe(gpe_event_info);
 145         if (ACPI_FAILURE(status)) {
 146                 return_ACPI_STATUS(status);
 147         }
 148
 149         /* Enable the requested GPE */
 150
 151         status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
 152         return_ACPI_STATUS(status);
 153 }
 154
 155 /*******************************************************************************
 156  *
 157  * FUNCTION:    acpi_ev_disable_gpe
 158  *
 159  * PARAMETERS:  gpe_event_info          - GPE to disable
 160  *
 161  * RETURN:      Status
 162  *
 163  * DESCRIPTION: Hardware-disable a GPE. Always disables the requested GPE,
 164  *              regardless of the type or number of references.
 165  *
 166  * Note: The GPE lock should be already acquired when this function is called.
 167  *
 168  ******************************************************************************/
 169
 170 acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 171 {
 172         acpi_status status;
 173
 174         ACPI_FUNCTION_TRACE(ev_disable_gpe);
 175
 176
 177         /*
 178          * Note: Always disable the GPE, even if we think that that it is already
 179          * disabled. It is possible that the AML or some other code has enabled
 180          * the GPE behind our back.
 181          */
 182
 183         /* Ensure the HW enable masks are current */
 184
 185         status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
 186         if (ACPI_FAILURE(status)) {
 187                 return_ACPI_STATUS(status);
 188         }
 189
 190         /*
 191          * Always H/W disable this GPE, even if we don't know the GPE type.
 192          * Simply clear the enable bit for this particular GPE, but do not
 193          * write out the current GPE enable mask since this may inadvertently
 194          * enable GPEs too early. An example is a rogue GPE that has arrived
 195          * during ACPICA initialization - possibly because AML or other code
 196          * has enabled the GPE.
 197          */
 198         status = acpi_hw_low_disable_gpe(gpe_event_info);
 199         return_ACPI_STATUS(status);
 200 }
 201
 202
 203 /*******************************************************************************
 204  *
 205  * FUNCTION:    acpi_ev_low_get_gpe_info
 206  *
 207  * PARAMETERS:  gpe_number          - Raw GPE number
 208  *              gpe_block           - A GPE info block
 209  *
 210  * RETURN:      A GPE event_info struct. NULL if not a valid GPE (The gpe_number
 211  *              is not within the specified GPE block)
 212  *
 213  * DESCRIPTION: Returns the event_info struct associated with this GPE. This is
 214  *              the low-level implementation of ev_get_gpe_event_info.
 215  *
 216  ******************************************************************************/
 217
 218 struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number,
 219                                                      struct acpi_gpe_block_info
 220                                                      *gpe_block)
 221 {
 222         u32 gpe_index;
 223
 224         /*
 225          * Validate that the gpe_number is within the specified gpe_block.
 226          * (Two steps)
 227          */
 228         if (!gpe_block || (gpe_number < gpe_block->block_base_number)) {
 229                 return (NULL);
 230         }
 231
 232         gpe_index = gpe_number - gpe_block->block_base_number;
 233         if (gpe_index >= gpe_block->gpe_count) {
 234                 return (NULL);
 235         }
 236
 237         return (&gpe_block->event_info[gpe_index]);
 238 }
 239
 240
 241 /*******************************************************************************
 242  *
 243  * FUNCTION:    acpi_ev_get_gpe_event_info
 244  *
 245  * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1
 246  *              gpe_number          - Raw GPE number
 247  *
 248  * RETURN:      A GPE event_info struct. NULL if not a valid GPE
 249  *
 250  * DESCRIPTION: Returns the event_info struct associated with this GPE.
 251  *              Validates the gpe_block and the gpe_number
 252  *
 253  *              Should be called only when the GPE lists are semaphore locked
 254  *              and not subject to change.
 255  *
 256  ******************************************************************************/
 257
 258 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
 259                                                        u32 gpe_number)
 260 {
 261         union acpi_operand_object *obj_desc;
 262         struct acpi_gpe_event_info *gpe_info;
 263         u32 i;
 264
 265         ACPI_FUNCTION_ENTRY();
 266
 267         /* A NULL gpe_block means use the FADT-defined GPE block(s) */
 268
 269         if (!gpe_device) {
 270
 271                 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
 272
 273                 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
 274                         gpe_info = acpi_ev_low_get_gpe_info(gpe_number,
 275                                                             acpi_gbl_gpe_fadt_blocks
 276                                                             [i]);
 277                         if (gpe_info) {
 278                                 return (gpe_info);
 279                         }
 280                 }
 281
 282                 /* The gpe_number was not in the range of either FADT GPE block */
 283
 284                 return (NULL);
 285         }
 286
 287         /* A Non-NULL gpe_device means this is a GPE Block Device */
 288
 289         obj_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *)
 290                                                gpe_device);
 291         if (!obj_desc || !obj_desc->device.gpe_block) {
 292                 return (NULL);
 293         }
 294
 295         return (acpi_ev_low_get_gpe_info
 296                 (gpe_number, obj_desc->device.gpe_block));
 297 }
 298
 299 /*******************************************************************************
 300  *
 301  * FUNCTION:    acpi_ev_gpe_detect
 302  *
 303  * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
 304  *                                    Can have multiple GPE blocks attached.
 305  *
 306  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 307  *
 308  * DESCRIPTION: Detect if any GP events have occurred. This function is
 309  *              executed at interrupt level.
 310  *
 311  ******************************************************************************/
 312
 313 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 314 {
 315         acpi_status status;
 316         struct acpi_gpe_block_info *gpe_block;
 317         struct acpi_gpe_register_info *gpe_register_info;
 318         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
 319         u8 enabled_status_byte;
 320         u32 status_reg;
 321         u32 enable_reg;
 322         acpi_cpu_flags flags;
 323         u32 i;
 324         u32 j;
 325
 326         ACPI_FUNCTION_NAME(ev_gpe_detect);
 327
 328         /* Check for the case where there are no GPEs */
 329
 330         if (!gpe_xrupt_list) {
 331                 return (int_status);
 332         }
 333
 334         /*
 335          * We need to obtain the GPE lock for both the data structs and registers
 336          * Note: Not necessary to obtain the hardware lock, since the GPE
 337          * registers are owned by the gpe_lock.
 338          */
 339         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 340
 341         /* Examine all GPE blocks attached to this interrupt level */
 342
 343         gpe_block = gpe_xrupt_list->gpe_block_list_head;
 344         while (gpe_block) {
 345                 /*
 346                  * Read all of the 8-bit GPE status and enable registers in this GPE
 347                  * block, saving all of them. Find all currently active GP events.
 348                  */
 349                 for (i = 0; i < gpe_block->register_count; i++) {
 350
 351                         /* Get the next status/enable pair */
 352
 353                         gpe_register_info = &gpe_block->register_info[i];
 354
 355                         /* Read the Status Register */
 356
 357                         status =
 358                             acpi_hw_read(&status_reg,
 359                                          &gpe_register_info->status_address);
 360                         if (ACPI_FAILURE(status)) {
 361                                 goto unlock_and_exit;
 362                         }
 363
 364                         /* Read the Enable Register */
 365
 366                         status =
 367                             acpi_hw_read(&enable_reg,
 368                                          &gpe_register_info->enable_address);
 369                         if (ACPI_FAILURE(status)) {
 370                                 goto unlock_and_exit;
 371                         }
 372
 373                         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
 374                                           "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
 375                                           gpe_register_info->base_gpe_number,
 376                                           status_reg, enable_reg));
 377
 378                         /* Check if there is anything active at all in this register */
 379
 380                         enabled_status_byte = (u8) (status_reg & enable_reg);
 381                         if (!enabled_status_byte) {
 382
 383                                 /* No active GPEs in this register, move on */
 384
 385                                 continue;
 386                         }
 387
 388                         /* Now look at the individual GPEs in this byte register */
 389
 390                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 391
 392                                 /* Examine one GPE bit */
 393
 394                                 if (enabled_status_byte & (1 << j)) {
 395                                         /*
 396                                          * Found an active GPE. Dispatch the event to a handler
 397                                          * or method.
 398                                          */
 399                                         int_status |=
 400                                             acpi_ev_gpe_dispatch(&gpe_block->
 401                                                 event_info[((acpi_size) i * ACPI_GPE_REGISTER_WIDTH) + j], j + gpe_register_info->base_gpe_number);
 402                                 }
 403                         }
 404                 }
 405
 406                 gpe_block = gpe_block->next;
 407         }
 408
 409       unlock_and_exit:
 410
 411         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 412         return (int_status);
 413 }
 414
 415 /*******************************************************************************
 416  *
 417  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
 418  *
 419  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 420  *
 421  * RETURN:      None
 422  *
 423  * DESCRIPTION: Perform the actual execution of a GPE control method. This
 424  *              function is called from an invocation of acpi_os_execute and
 425  *              therefore does NOT execute at interrupt level - so that
 426  *              the control method itself is not executed in the context of
 427  *              an interrupt handler.
 428  *
 429  ******************************************************************************/
 430 static void acpi_ev_asynch_enable_gpe(void *context);
 431
 432 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
 433 {
 434         struct acpi_gpe_event_info *gpe_event_info = (void *)context;
 435         acpi_status status;
 436         struct acpi_gpe_event_info local_gpe_event_info;
 437         struct acpi_evaluate_info *info;
 438
 439         ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
 440
 441         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 442         if (ACPI_FAILURE(status)) {
 443                 return_VOID;
 444         }
 445
 446         /* Must revalidate the gpe_number/gpe_block */
 447
 448         if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
 449                 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 450                 return_VOID;
 451         }
 452
 453         /* Update the GPE register masks for return to enabled state */
 454
 455         (void)acpi_ev_update_gpe_enable_masks(gpe_event_info);
 456
 457         /*
 458          * Take a snapshot of the GPE info for this level - we copy the info to
 459          * prevent a race condition with remove_handler/remove_block.
 460          */
 461         ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
 462                     sizeof(struct acpi_gpe_event_info));
 463
 464         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 465         if (ACPI_FAILURE(status)) {
 466                 return_VOID;
 467         }
 468
 469         /*
 470          * Must check for control method type dispatch one more time to avoid a
 471          * race with ev_gpe_install_handler
 472          */
 473         if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
 474             ACPI_GPE_DISPATCH_METHOD) {
 475
 476                 /* Allocate the evaluation information block */
 477
 478                 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 479                 if (!info) {
 480                         status = AE_NO_MEMORY;
 481                 } else {
 482                         /*
 483                          * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
 484                          * control method that corresponds to this GPE
 485                          */
 486                         info->prefix_node =
 487                             local_gpe_event_info.dispatch.method_node;
 488                         info->flags = ACPI_IGNORE_RETURN_VALUE;
 489
 490                         status = acpi_ns_evaluate(info);
 491                         ACPI_FREE(info);
 492                 }
 493
 494                 if (ACPI_FAILURE(status)) {
 495                         ACPI_EXCEPTION((AE_INFO, status,
 496                                         "while evaluating GPE method [%4.4s]",
 497                                         acpi_ut_get_node_name
 498                                         (local_gpe_event_info.dispatch.
 499                                          method_node)));
 500                 }
 501         }
 502         /* Defer enabling of GPE until all notify handlers are done */
 503         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_asynch_enable_gpe,
 504                                 gpe_event_info);
 505         return_VOID;
 506 }
 507
 508 static void acpi_ev_asynch_enable_gpe(void *context)
 509 {
 510         struct acpi_gpe_event_info *gpe_event_info = context;
 511         acpi_status status;
 512         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 513             ACPI_GPE_LEVEL_TRIGGERED) {
 514                 /*
 515                  * GPE is level-triggered, we clear the GPE status bit after handling
 516                  * the event.
 517                  */
 518                 status = acpi_hw_clear_gpe(gpe_event_info);
 519                 if (ACPI_FAILURE(status)) {
 520                         return_VOID;
 521                 }
 522         }
 523
 524         /* Enable this GPE */
 525         (void)acpi_hw_write_gpe_enable_reg(gpe_event_info);
 526         return_VOID;
 527 }
 528
 529 /*******************************************************************************
 530  *
 531  * FUNCTION:    acpi_ev_gpe_dispatch
 532  *
 533  * PARAMETERS:  gpe_event_info  - Info for this GPE
 534  *              gpe_number      - Number relative to the parent GPE block
 535  *
 536  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 537  *
 538  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 539  *              or method (e.g. _Lxx/_Exx) handler.
 540  *
 541  *              This function executes at interrupt level.
 542  *
 543  ******************************************************************************/
 544
 545 u32
 546 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
 547 {
 548         acpi_status status;
 549
 550         ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
 551
 552         acpi_os_gpe_count(gpe_number);
 553
 554         /*
 555          * If edge-triggered, clear the GPE status bit now. Note that
 556          * level-triggered events are cleared after the GPE is serviced.
 557          */
 558         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 559             ACPI_GPE_EDGE_TRIGGERED) {
 560                 status = acpi_hw_clear_gpe(gpe_event_info);
 561                 if (ACPI_FAILURE(status)) {
 562                         ACPI_EXCEPTION((AE_INFO, status,
 563                                         "Unable to clear GPE[0x%2X]",
 564                                         gpe_number));
 565                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 566                 }
 567         }
 568
 569         /*
 570          * Dispatch the GPE to either an installed handler, or the control method
 571          * associated with this GPE (_Lxx or _Exx). If a handler exists, we invoke
 572          * it and do not attempt to run the method. If there is neither a handler
 573          * nor a method, we disable this GPE to prevent further such pointless
 574          * events from firing.
 575          */
 576         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
 577         case ACPI_GPE_DISPATCH_HANDLER:
 578
 579                 /*
 580                  * Invoke the installed handler (at interrupt level)
 581                  * Ignore return status for now.
 582                  * TBD: leave GPE disabled on error?
 583                  */
 584                 (void)gpe_event_info->dispatch.handler->address(gpe_event_info->
 585                                                                 dispatch.
 586                                                                 handler->
 587                                                                 context);
 588
 589                 /* It is now safe to clear level-triggered events. */
 590
 591                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 592                     ACPI_GPE_LEVEL_TRIGGERED) {
 593                         status = acpi_hw_clear_gpe(gpe_event_info);
 594                         if (ACPI_FAILURE(status)) {
 595                                 ACPI_EXCEPTION((AE_INFO, status,
 596                                         "Unable to clear GPE[0x%2X]",
 597                                                 gpe_number));
 598                                 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 599                         }
 600                 }
 601                 break;
 602
 603         case ACPI_GPE_DISPATCH_METHOD:
 604
 605                 /*
 606                  * Disable the GPE, so it doesn't keep firing before the method has a
 607                  * chance to run (it runs asynchronously with interrupts enabled).
 608                  */
 609                 status = acpi_ev_disable_gpe(gpe_event_info);
 610                 if (ACPI_FAILURE(status)) {
 611                         ACPI_EXCEPTION((AE_INFO, status,
 612                                         "Unable to disable GPE[0x%2X]",
 613                                         gpe_number));
 614                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 615                 }
 616
 617                 /*
 618                  * Execute the method associated with the GPE
 619                  * NOTE: Level-triggered GPEs are cleared after the method completes.
 620                  */
 621                 status = acpi_os_execute(OSL_GPE_HANDLER,
 622                                          acpi_ev_asynch_execute_gpe_method,
 623                                          gpe_event_info);
 624                 if (ACPI_FAILURE(status)) {
 625                         ACPI_EXCEPTION((AE_INFO, status,
 626                                         "Unable to queue handler for GPE[0x%2X] - event disabled",
 627                                         gpe_number));
 628                 }
 629                 break;
 630
 631         default:
 632
 633                 /*
 634                  * No handler or method to run!
 635                  * 03/2010: This case should no longer be possible. We will not allow
 636                  * a GPE to be enabled if it has no handler or method.
 637                  */
 638                 ACPI_ERROR((AE_INFO,
 639                             "No handler or method for GPE[0x%2X], disabling event",
 640                             gpe_number));
 641
 642                 /*
 643                  * Disable the GPE. The GPE will remain disabled a handler
 644                  * is installed or ACPICA is restarted.
 645                  */
 646                 status = acpi_ev_disable_gpe(gpe_event_info);
 647                 if (ACPI_FAILURE(status)) {
 648                         ACPI_EXCEPTION((AE_INFO, status,
 649                                         "Unable to disable GPE[0x%2X]",
 650                                         gpe_number));
 651                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 652                 }
 653                 break;
 654         }
 655
 656         return_UINT32(ACPI_INTERRUPT_HANDLED);
 657 }