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         u8 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 = (u8)
  82             (1 <<
  83              (gpe_event_info->gpe_number - gpe_register_info->base_gpe_number));
  84
  85         /* Clear the wake/run bits up front */
  86
  87         ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake, register_bit);
  88         ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
  89
  90         /* Set the mask bits only if there are references to this GPE */
  91
  92         if (gpe_event_info->runtime_count) {
  93                 ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
  94         }
  95
  96         if (gpe_event_info->wakeup_count) {
  97                 ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
  98         }
  99
 100         return_ACPI_STATUS(AE_OK);
 101 }
 102
 103 /*******************************************************************************
 104  *
 105  * FUNCTION:    acpi_ev_enable_gpe
 106  *
 107  * PARAMETERS:  gpe_event_info          - GPE to enable
 108  *
 109  * RETURN:      Status
 110  *
 111  * DESCRIPTION: Hardware-enable a GPE. Always enables the GPE, regardless
 112  *              of type or number of references.
 113  *
 114  * Note: The GPE lock should be already acquired when this function is called.
 115  *
 116  ******************************************************************************/
 117
 118 acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 119 {
 120         acpi_status status;
 121
 122
 123         ACPI_FUNCTION_TRACE(ev_enable_gpe);
 124
 125
 126         /*
 127          * We will only allow a GPE to be enabled if it has either an
 128          * associated method (_Lxx/_Exx) or a handler. Otherwise, the
 129          * GPE will be immediately disabled by acpi_ev_gpe_dispatch the
 130          * first time it fires.
 131          */
 132         if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)) {
 133                 return_ACPI_STATUS(AE_NO_HANDLER);
 134         }
 135
 136         /* Ensure the HW enable masks are current */
 137
 138         status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
 139         if (ACPI_FAILURE(status)) {
 140                 return_ACPI_STATUS(status);
 141         }
 142
 143         /* Clear the GPE (of stale events) */
 144
 145         status = acpi_hw_clear_gpe(gpe_event_info);
 146         if (ACPI_FAILURE(status)) {
 147                 return_ACPI_STATUS(status);
 148         }
 149
 150         /* Enable the requested GPE */
 151
 152         status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
 153         return_ACPI_STATUS(status);
 154 }
 155
 156 /*******************************************************************************
 157  *
 158  * FUNCTION:    acpi_ev_disable_gpe
 159  *
 160  * PARAMETERS:  gpe_event_info          - GPE to disable
 161  *
 162  * RETURN:      Status
 163  *
 164  * DESCRIPTION: Hardware-disable a GPE. Always disables the requested GPE,
 165  *              regardless of the type or number of references.
 166  *
 167  * Note: The GPE lock should be already acquired when this function is called.
 168  *
 169  ******************************************************************************/
 170
 171 acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 172 {
 173         acpi_status status;
 174
 175         ACPI_FUNCTION_TRACE(ev_disable_gpe);
 176
 177
 178         /*
 179          * Note: Always disable the GPE, even if we think that that it is already
 180          * disabled. It is possible that the AML or some other code has enabled
 181          * the GPE behind our back.
 182          */
 183
 184         /* Ensure the HW enable masks are current */
 185
 186         status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
 187         if (ACPI_FAILURE(status)) {
 188                 return_ACPI_STATUS(status);
 189         }
 190
 191         /*
 192          * Always H/W disable this GPE, even if we don't know the GPE type.
 193          * Simply clear the enable bit for this particular GPE, but do not
 194          * write out the current GPE enable mask since this may inadvertently
 195          * enable GPEs too early. An example is a rogue GPE that has arrived
 196          * during ACPICA initialization - possibly because AML or other code
 197          * has enabled the GPE.
 198          */
 199         status = acpi_hw_low_disable_gpe(gpe_event_info);
 200         return_ACPI_STATUS(status);
 201 }
 202
 203
 204 /*******************************************************************************
 205  *
 206  * FUNCTION:    acpi_ev_low_get_gpe_info
 207  *
 208  * PARAMETERS:  gpe_number          - Raw GPE number
 209  *              gpe_block           - A GPE info block
 210  *
 211  * RETURN:      A GPE event_info struct. NULL if not a valid GPE (The gpe_number
 212  *              is not within the specified GPE block)
 213  *
 214  * DESCRIPTION: Returns the event_info struct associated with this GPE. This is
 215  *              the low-level implementation of ev_get_gpe_event_info.
 216  *
 217  ******************************************************************************/
 218
 219 struct acpi_gpe_event_info *acpi_ev_low_get_gpe_info(u32 gpe_number,
 220                                                      struct acpi_gpe_block_info
 221                                                      *gpe_block)
 222 {
 223         u32 gpe_index;
 224
 225         /*
 226          * Validate that the gpe_number is within the specified gpe_block.
 227          * (Two steps)
 228          */
 229         if (!gpe_block || (gpe_number < gpe_block->block_base_number)) {
 230                 return (NULL);
 231         }
 232
 233         gpe_index = gpe_number - gpe_block->block_base_number;
 234         if (gpe_index >= gpe_block->gpe_count) {
 235                 return (NULL);
 236         }
 237
 238         return (&gpe_block->event_info[gpe_index]);
 239 }
 240
 241
 242 /*******************************************************************************
 243  *
 244  * FUNCTION:    acpi_ev_get_gpe_event_info
 245  *
 246  * PARAMETERS:  gpe_device          - Device node. NULL for GPE0/GPE1
 247  *              gpe_number          - Raw GPE number
 248  *
 249  * RETURN:      A GPE event_info struct. NULL if not a valid GPE
 250  *
 251  * DESCRIPTION: Returns the event_info struct associated with this GPE.
 252  *              Validates the gpe_block and the gpe_number
 253  *
 254  *              Should be called only when the GPE lists are semaphore locked
 255  *              and not subject to change.
 256  *
 257  ******************************************************************************/
 258
 259 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
 260                                                        u32 gpe_number)
 261 {
 262         union acpi_operand_object *obj_desc;
 263         struct acpi_gpe_event_info *gpe_info;
 264         u32 i;
 265
 266         ACPI_FUNCTION_ENTRY();
 267
 268         /* A NULL gpe_device means use the FADT-defined GPE block(s) */
 269
 270         if (!gpe_device) {
 271
 272                 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
 273
 274                 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
 275                         gpe_info = acpi_ev_low_get_gpe_info(gpe_number,
 276                                                             acpi_gbl_gpe_fadt_blocks
 277                                                             [i]);
 278                         if (gpe_info) {
 279                                 return (gpe_info);
 280                         }
 281                 }
 282
 283                 /* The gpe_number was not in the range of either FADT GPE block */
 284
 285                 return (NULL);
 286         }
 287
 288         /* A Non-NULL gpe_device means this is a GPE Block Device */
 289
 290         obj_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *)
 291                                                gpe_device);
 292         if (!obj_desc || !obj_desc->device.gpe_block) {
 293                 return (NULL);
 294         }
 295
 296         return (acpi_ev_low_get_gpe_info
 297                 (gpe_number, obj_desc->device.gpe_block));
 298 }
 299
 300 /*******************************************************************************
 301  *
 302  * FUNCTION:    acpi_ev_gpe_detect
 303  *
 304  * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
 305  *                                    Can have multiple GPE blocks attached.
 306  *
 307  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 308  *
 309  * DESCRIPTION: Detect if any GP events have occurred. This function is
 310  *              executed at interrupt level.
 311  *
 312  ******************************************************************************/
 313
 314 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
 315 {
 316         acpi_status status;
 317         struct acpi_gpe_block_info *gpe_block;
 318         struct acpi_gpe_register_info *gpe_register_info;
 319         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
 320         u8 enabled_status_byte;
 321         u32 status_reg;
 322         u32 enable_reg;
 323         acpi_cpu_flags flags;
 324         u32 i;
 325         u32 j;
 326
 327         ACPI_FUNCTION_NAME(ev_gpe_detect);
 328
 329         /* Check for the case where there are no GPEs */
 330
 331         if (!gpe_xrupt_list) {
 332                 return (int_status);
 333         }
 334
 335         /*
 336          * We need to obtain the GPE lock for both the data structs and registers
 337          * Note: Not necessary to obtain the hardware lock, since the GPE
 338          * registers are owned by the gpe_lock.
 339          */
 340         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 341
 342         /* Examine all GPE blocks attached to this interrupt level */
 343
 344         gpe_block = gpe_xrupt_list->gpe_block_list_head;
 345         while (gpe_block) {
 346                 /*
 347                  * Read all of the 8-bit GPE status and enable registers in this GPE
 348                  * block, saving all of them. Find all currently active GP events.
 349                  */
 350                 for (i = 0; i < gpe_block->register_count; i++) {
 351
 352                         /* Get the next status/enable pair */
 353
 354                         gpe_register_info = &gpe_block->register_info[i];
 355
 356                         /* Read the Status Register */
 357
 358                         status =
 359                             acpi_hw_read(&status_reg,
 360                                          &gpe_register_info->status_address);
 361                         if (ACPI_FAILURE(status)) {
 362                                 goto unlock_and_exit;
 363                         }
 364
 365                         /* Read the Enable Register */
 366
 367                         status =
 368                             acpi_hw_read(&enable_reg,
 369                                          &gpe_register_info->enable_address);
 370                         if (ACPI_FAILURE(status)) {
 371                                 goto unlock_and_exit;
 372                         }
 373
 374                         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
 375                                           "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
 376                                           gpe_register_info->base_gpe_number,
 377                                           status_reg, enable_reg));
 378
 379                         /* Check if there is anything active at all in this register */
 380
 381                         enabled_status_byte = (u8) (status_reg & enable_reg);
 382                         if (!enabled_status_byte) {
 383
 384                                 /* No active GPEs in this register, move on */
 385
 386                                 continue;
 387                         }
 388
 389                         /* Now look at the individual GPEs in this byte register */
 390
 391                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
 392
 393                                 /* Examine one GPE bit */
 394
 395                                 if (enabled_status_byte & (1 << j)) {
 396                                         /*
 397                                          * Found an active GPE. Dispatch the event to a handler
 398                                          * or method.
 399                                          */
 400                                         int_status |=
 401                                             acpi_ev_gpe_dispatch(&gpe_block->
 402                                                 event_info[((acpi_size) i * ACPI_GPE_REGISTER_WIDTH) + j], j + gpe_register_info->base_gpe_number);
 403                                 }
 404                         }
 405                 }
 406
 407                 gpe_block = gpe_block->next;
 408         }
 409
 410       unlock_and_exit:
 411
 412         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 413         return (int_status);
 414 }
 415
 416 /*******************************************************************************
 417  *
 418  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
 419  *
 420  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
 421  *
 422  * RETURN:      None
 423  *
 424  * DESCRIPTION: Perform the actual execution of a GPE control method. This
 425  *              function is called from an invocation of acpi_os_execute and
 426  *              therefore does NOT execute at interrupt level - so that
 427  *              the control method itself is not executed in the context of
 428  *              an interrupt handler.
 429  *
 430  ******************************************************************************/
 431 static void acpi_ev_asynch_enable_gpe(void *context);
 432
 433 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
 434 {
 435         struct acpi_gpe_event_info *gpe_event_info = (void *)context;
 436         acpi_status status;
 437         struct acpi_gpe_event_info local_gpe_event_info;
 438         struct acpi_evaluate_info *info;
 439
 440         ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
 441
 442         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
 443         if (ACPI_FAILURE(status)) {
 444                 return_VOID;
 445         }
 446
 447         /* Must revalidate the gpe_number/gpe_block */
 448
 449         if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
 450                 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 451                 return_VOID;
 452         }
 453
 454         /* Update the GPE register masks for return to enabled state */
 455
 456         (void)acpi_ev_update_gpe_enable_masks(gpe_event_info);
 457
 458         /*
 459          * Take a snapshot of the GPE info for this level - we copy the info to
 460          * prevent a race condition with remove_handler/remove_block.
 461          */
 462         ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
 463                     sizeof(struct acpi_gpe_event_info));
 464
 465         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
 466         if (ACPI_FAILURE(status)) {
 467                 return_VOID;
 468         }
 469
 470         /*
 471          * Must check for control method type dispatch one more time to avoid a
 472          * race with ev_gpe_install_handler
 473          */
 474         if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
 475             ACPI_GPE_DISPATCH_METHOD) {
 476
 477                 /* Allocate the evaluation information block */
 478
 479                 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
 480                 if (!info) {
 481                         status = AE_NO_MEMORY;
 482                 } else {
 483                         /*
 484                          * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
 485                          * control method that corresponds to this GPE
 486                          */
 487                         info->prefix_node =
 488                             local_gpe_event_info.dispatch.method_node;
 489                         info->flags = ACPI_IGNORE_RETURN_VALUE;
 490
 491                         status = acpi_ns_evaluate(info);
 492                         ACPI_FREE(info);
 493                 }
 494
 495                 if (ACPI_FAILURE(status)) {
 496                         ACPI_EXCEPTION((AE_INFO, status,
 497                                         "while evaluating GPE method [%4.4s]",
 498                                         acpi_ut_get_node_name
 499                                         (local_gpe_event_info.dispatch.
 500                                          method_node)));
 501                 }
 502         }
 503         /* Defer enabling of GPE until all notify handlers are done */
 504         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_asynch_enable_gpe,
 505                                 gpe_event_info);
 506         return_VOID;
 507 }
 508
 509 static void acpi_ev_asynch_enable_gpe(void *context)
 510 {
 511         struct acpi_gpe_event_info *gpe_event_info = context;
 512         acpi_status status;
 513         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 514             ACPI_GPE_LEVEL_TRIGGERED) {
 515                 /*
 516                  * GPE is level-triggered, we clear the GPE status bit after handling
 517                  * the event.
 518                  */
 519                 status = acpi_hw_clear_gpe(gpe_event_info);
 520                 if (ACPI_FAILURE(status)) {
 521                         return_VOID;
 522                 }
 523         }
 524
 525         /* Enable this GPE */
 526         (void)acpi_hw_write_gpe_enable_reg(gpe_event_info);
 527         return_VOID;
 528 }
 529
 530 /*******************************************************************************
 531  *
 532  * FUNCTION:    acpi_ev_gpe_dispatch
 533  *
 534  * PARAMETERS:  gpe_event_info  - Info for this GPE
 535  *              gpe_number      - Number relative to the parent GPE block
 536  *
 537  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
 538  *
 539  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
 540  *              or method (e.g. _Lxx/_Exx) handler.
 541  *
 542  *              This function executes at interrupt level.
 543  *
 544  ******************************************************************************/
 545
 546 u32
 547 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
 548 {
 549         acpi_status status;
 550
 551         ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
 552
 553         acpi_os_gpe_count(gpe_number);
 554
 555         /*
 556          * If edge-triggered, clear the GPE status bit now. Note that
 557          * level-triggered events are cleared after the GPE is serviced.
 558          */
 559         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 560             ACPI_GPE_EDGE_TRIGGERED) {
 561                 status = acpi_hw_clear_gpe(gpe_event_info);
 562                 if (ACPI_FAILURE(status)) {
 563                         ACPI_EXCEPTION((AE_INFO, status,
 564                                         "Unable to clear GPE[0x%2X]",
 565                                         gpe_number));
 566                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 567                 }
 568         }
 569
 570         /*
 571          * Dispatch the GPE to either an installed handler, or the control method
 572          * associated with this GPE (_Lxx or _Exx). If a handler exists, we invoke
 573          * it and do not attempt to run the method. If there is neither a handler
 574          * nor a method, we disable this GPE to prevent further such pointless
 575          * events from firing.
 576          */
 577         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
 578         case ACPI_GPE_DISPATCH_HANDLER:
 579
 580                 /*
 581                  * Invoke the installed handler (at interrupt level)
 582                  * Ignore return status for now.
 583                  * TBD: leave GPE disabled on error?
 584                  */
 585                 (void)gpe_event_info->dispatch.handler->address(gpe_event_info->
 586                                                                 dispatch.
 587                                                                 handler->
 588                                                                 context);
 589
 590                 /* It is now safe to clear level-triggered events. */
 591
 592                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
 593                     ACPI_GPE_LEVEL_TRIGGERED) {
 594                         status = acpi_hw_clear_gpe(gpe_event_info);
 595                         if (ACPI_FAILURE(status)) {
 596                                 ACPI_EXCEPTION((AE_INFO, status,
 597                                         "Unable to clear GPE[0x%2X]",
 598                                                 gpe_number));
 599                                 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 600                         }
 601                 }
 602                 break;
 603
 604         case ACPI_GPE_DISPATCH_METHOD:
 605
 606                 /*
 607                  * Disable the GPE, so it doesn't keep firing before the method has a
 608                  * chance to run (it runs asynchronously with interrupts enabled).
 609                  */
 610                 status = acpi_ev_disable_gpe(gpe_event_info);
 611                 if (ACPI_FAILURE(status)) {
 612                         ACPI_EXCEPTION((AE_INFO, status,
 613                                         "Unable to disable GPE[0x%2X]",
 614                                         gpe_number));
 615                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 616                 }
 617
 618                 /*
 619                  * Execute the method associated with the GPE
 620                  * NOTE: Level-triggered GPEs are cleared after the method completes.
 621                  */
 622                 status = acpi_os_execute(OSL_GPE_HANDLER,
 623                                          acpi_ev_asynch_execute_gpe_method,
 624                                          gpe_event_info);
 625                 if (ACPI_FAILURE(status)) {
 626                         ACPI_EXCEPTION((AE_INFO, status,
 627                                         "Unable to queue handler for GPE[0x%2X] - event disabled",
 628                                         gpe_number));
 629                 }
 630                 break;
 631
 632         default:
 633
 634                 /*
 635                  * No handler or method to run!
 636                  * 03/2010: This case should no longer be possible. We will not allow
 637                  * a GPE to be enabled if it has no handler or method.
 638                  */
 639                 ACPI_ERROR((AE_INFO,
 640                             "No handler or method for GPE[0x%2X], disabling event",
 641                             gpe_number));
 642
 643                 /*
 644                  * Disable the GPE. The GPE will remain disabled a handler
 645                  * is installed or ACPICA is restarted.
 646                  */
 647                 status = acpi_ev_disable_gpe(gpe_event_info);
 648                 if (ACPI_FAILURE(status)) {
 649                         ACPI_EXCEPTION((AE_INFO, status,
 650                                         "Unable to disable GPE[0x%2X]",
 651                                         gpe_number));
 652                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
 653                 }
 654                 break;
 655         }
 656
 657         return_UINT32(ACPI_INTERRUPT_HANDLED);
 658 }