Merge commit 'v2.6.27-rc3' into x86/prototypes
[linux-2.6] / drivers / acpi / events / evgpe.c
1 /******************************************************************************
2  *
3  * Module Name: evgpe - General Purpose Event handling and dispatch
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2008, 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 <acpi/acevents.h>
46 #include <acpi/acnamesp.h>
47
48 #define _COMPONENT          ACPI_EVENTS
49 ACPI_MODULE_NAME("evgpe")
50
51 /* Local prototypes */
52 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
53
54 /*******************************************************************************
55  *
56  * FUNCTION:    acpi_ev_set_gpe_type
57  *
58  * PARAMETERS:  gpe_event_info          - GPE to set
59  *              Type                    - New type
60  *
61  * RETURN:      Status
62  *
63  * DESCRIPTION: Sets the new type for the GPE (wake, run, or wake/run)
64  *
65  ******************************************************************************/
66
67 acpi_status
68 acpi_ev_set_gpe_type(struct acpi_gpe_event_info *gpe_event_info, u8 type)
69 {
70         acpi_status status;
71
72         ACPI_FUNCTION_TRACE(ev_set_gpe_type);
73
74         /* Validate type and update register enable masks */
75
76         switch (type) {
77         case ACPI_GPE_TYPE_WAKE:
78         case ACPI_GPE_TYPE_RUNTIME:
79         case ACPI_GPE_TYPE_WAKE_RUN:
80                 break;
81
82         default:
83                 return_ACPI_STATUS(AE_BAD_PARAMETER);
84         }
85
86         /* Disable the GPE if currently enabled */
87
88         status = acpi_ev_disable_gpe(gpe_event_info);
89
90         /* Type was validated above */
91
92         gpe_event_info->flags &= ~ACPI_GPE_TYPE_MASK;   /* Clear type bits */
93         gpe_event_info->flags |= type;  /* Insert type */
94         return_ACPI_STATUS(status);
95 }
96
97 /*******************************************************************************
98  *
99  * FUNCTION:    acpi_ev_update_gpe_enable_masks
100  *
101  * PARAMETERS:  gpe_event_info          - GPE to update
102  *              Type                    - What to do: ACPI_GPE_DISABLE or
103  *                                        ACPI_GPE_ENABLE
104  *
105  * RETURN:      Status
106  *
107  * DESCRIPTION: Updates GPE register enable masks based on the GPE type
108  *
109  ******************************************************************************/
110
111 acpi_status
112 acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info,
113                                 u8 type)
114 {
115         struct acpi_gpe_register_info *gpe_register_info;
116         u8 register_bit;
117
118         ACPI_FUNCTION_TRACE(ev_update_gpe_enable_masks);
119
120         gpe_register_info = gpe_event_info->register_info;
121         if (!gpe_register_info) {
122                 return_ACPI_STATUS(AE_NOT_EXIST);
123         }
124         register_bit = (u8)
125             (1 <<
126              (gpe_event_info->gpe_number - gpe_register_info->base_gpe_number));
127
128         /* 1) Disable case.  Simply clear all enable bits */
129
130         if (type == ACPI_GPE_DISABLE) {
131                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
132                                register_bit);
133                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
134                 return_ACPI_STATUS(AE_OK);
135         }
136
137         /* 2) Enable case.  Set/Clear the appropriate enable bits */
138
139         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
140         case ACPI_GPE_TYPE_WAKE:
141                 ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
142                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
143                 break;
144
145         case ACPI_GPE_TYPE_RUNTIME:
146                 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
147                                register_bit);
148                 ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
149                 break;
150
151         case ACPI_GPE_TYPE_WAKE_RUN:
152                 ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
153                 ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
154                 break;
155
156         default:
157                 return_ACPI_STATUS(AE_BAD_PARAMETER);
158         }
159
160         return_ACPI_STATUS(AE_OK);
161 }
162
163 /*******************************************************************************
164  *
165  * FUNCTION:    acpi_ev_enable_gpe
166  *
167  * PARAMETERS:  gpe_event_info          - GPE to enable
168  *              write_to_hardware       - Enable now, or just mark data structs
169  *                                        (WAKE GPEs should be deferred)
170  *
171  * RETURN:      Status
172  *
173  * DESCRIPTION: Enable a GPE based on the GPE type
174  *
175  ******************************************************************************/
176
177 acpi_status
178 acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info,
179                    u8 write_to_hardware)
180 {
181         acpi_status status;
182
183         ACPI_FUNCTION_TRACE(ev_enable_gpe);
184
185         /* Make sure HW enable masks are updated */
186
187         status =
188             acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_ENABLE);
189         if (ACPI_FAILURE(status)) {
190                 return_ACPI_STATUS(status);
191         }
192
193         /* Mark wake-enabled or HW enable, or both */
194
195         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
196         case ACPI_GPE_TYPE_WAKE:
197
198                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
199                 break;
200
201         case ACPI_GPE_TYPE_WAKE_RUN:
202
203                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
204
205                 /*lint -fallthrough */
206
207         case ACPI_GPE_TYPE_RUNTIME:
208
209                 ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
210
211                 if (write_to_hardware) {
212
213                         /* Clear the GPE (of stale events), then enable it */
214
215                         status = acpi_hw_clear_gpe(gpe_event_info);
216                         if (ACPI_FAILURE(status)) {
217                                 return_ACPI_STATUS(status);
218                         }
219
220                         /* Enable the requested runtime GPE */
221
222                         status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
223                 }
224                 break;
225
226         default:
227                 return_ACPI_STATUS(AE_BAD_PARAMETER);
228         }
229
230         return_ACPI_STATUS(AE_OK);
231 }
232
233 /*******************************************************************************
234  *
235  * FUNCTION:    acpi_ev_disable_gpe
236  *
237  * PARAMETERS:  gpe_event_info          - GPE to disable
238  *
239  * RETURN:      Status
240  *
241  * DESCRIPTION: Disable a GPE based on the GPE type
242  *
243  ******************************************************************************/
244
245 acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
246 {
247         acpi_status status;
248
249         ACPI_FUNCTION_TRACE(ev_disable_gpe);
250
251         /* Make sure HW enable masks are updated */
252
253         status =
254             acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_DISABLE);
255         if (ACPI_FAILURE(status)) {
256                 return_ACPI_STATUS(status);
257         }
258
259         /* Clear the appropriate enabled flags for this GPE */
260
261         switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
262         case ACPI_GPE_TYPE_WAKE:
263                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
264                 break;
265
266         case ACPI_GPE_TYPE_WAKE_RUN:
267                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
268
269                 /* fallthrough */
270
271         case ACPI_GPE_TYPE_RUNTIME:
272
273                 /* Disable the requested runtime GPE */
274
275                 ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
276                 break;
277
278         default:
279                 break;
280         }
281
282         /*
283          * Even if we don't know the GPE type, make sure that we always
284          * disable it. low_disable_gpe will just clear the enable bit for this
285          * GPE and write it. It will not write out the current GPE enable mask,
286          * since this may inadvertently enable GPEs too early, if a rogue GPE has
287          * come in during ACPICA initialization - possibly as a result of AML or
288          * other code that has enabled the GPE.
289          */
290         status = acpi_hw_low_disable_gpe(gpe_event_info);
291         return_ACPI_STATUS(status);
292
293         return_ACPI_STATUS(AE_OK);
294 }
295
296 /*******************************************************************************
297  *
298  * FUNCTION:    acpi_ev_get_gpe_event_info
299  *
300  * PARAMETERS:  gpe_device          - Device node.  NULL for GPE0/GPE1
301  *              gpe_number          - Raw GPE number
302  *
303  * RETURN:      A GPE event_info struct. NULL if not a valid GPE
304  *
305  * DESCRIPTION: Returns the event_info struct associated with this GPE.
306  *              Validates the gpe_block and the gpe_number
307  *
308  *              Should be called only when the GPE lists are semaphore locked
309  *              and not subject to change.
310  *
311  ******************************************************************************/
312
313 struct acpi_gpe_event_info *acpi_ev_get_gpe_event_info(acpi_handle gpe_device,
314                                                        u32 gpe_number)
315 {
316         union acpi_operand_object *obj_desc;
317         struct acpi_gpe_block_info *gpe_block;
318         u32 i;
319
320         ACPI_FUNCTION_ENTRY();
321
322         /* A NULL gpe_block means use the FADT-defined GPE block(s) */
323
324         if (!gpe_device) {
325
326                 /* Examine GPE Block 0 and 1 (These blocks are permanent) */
327
328                 for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) {
329                         gpe_block = acpi_gbl_gpe_fadt_blocks[i];
330                         if (gpe_block) {
331                                 if ((gpe_number >= gpe_block->block_base_number)
332                                     && (gpe_number <
333                                         gpe_block->block_base_number +
334                                         (gpe_block->register_count * 8))) {
335                                         return (&gpe_block->
336                                                 event_info[gpe_number -
337                                                            gpe_block->
338                                                            block_base_number]);
339                                 }
340                         }
341                 }
342
343                 /* The gpe_number was not in the range of either FADT GPE block */
344
345                 return (NULL);
346         }
347
348         /* A Non-NULL gpe_device means this is a GPE Block Device */
349
350         obj_desc = acpi_ns_get_attached_object((struct acpi_namespace_node *)
351                                                gpe_device);
352         if (!obj_desc || !obj_desc->device.gpe_block) {
353                 return (NULL);
354         }
355
356         gpe_block = obj_desc->device.gpe_block;
357
358         if ((gpe_number >= gpe_block->block_base_number) &&
359             (gpe_number <
360              gpe_block->block_base_number + (gpe_block->register_count * 8))) {
361                 return (&gpe_block->
362                         event_info[gpe_number - gpe_block->block_base_number]);
363         }
364
365         return (NULL);
366 }
367
368 /*******************************************************************************
369  *
370  * FUNCTION:    acpi_ev_gpe_detect
371  *
372  * PARAMETERS:  gpe_xrupt_list      - Interrupt block for this interrupt.
373  *                                    Can have multiple GPE blocks attached.
374  *
375  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
376  *
377  * DESCRIPTION: Detect if any GP events have occurred.  This function is
378  *              executed at interrupt level.
379  *
380  ******************************************************************************/
381
382 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info * gpe_xrupt_list)
383 {
384         acpi_status status;
385         struct acpi_gpe_block_info *gpe_block;
386         struct acpi_gpe_register_info *gpe_register_info;
387         u32 int_status = ACPI_INTERRUPT_NOT_HANDLED;
388         u8 enabled_status_byte;
389         u32 status_reg;
390         u32 enable_reg;
391         acpi_cpu_flags flags;
392         u32 i;
393         u32 j;
394
395         ACPI_FUNCTION_NAME(ev_gpe_detect);
396
397         /* Check for the case where there are no GPEs */
398
399         if (!gpe_xrupt_list) {
400                 return (int_status);
401         }
402
403         /*
404          * We need to obtain the GPE lock for both the data structs and registers
405          * Note: Not necessary to obtain the hardware lock, since the GPE registers
406          * are owned by the gpe_lock.
407          */
408         flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
409
410         /* Examine all GPE blocks attached to this interrupt level */
411
412         gpe_block = gpe_xrupt_list->gpe_block_list_head;
413         while (gpe_block) {
414                 /*
415                  * Read all of the 8-bit GPE status and enable registers
416                  * in this GPE block, saving all of them.
417                  * Find all currently active GP events.
418                  */
419                 for (i = 0; i < gpe_block->register_count; i++) {
420
421                         /* Get the next status/enable pair */
422
423                         gpe_register_info = &gpe_block->register_info[i];
424
425                         /* Read the Status Register */
426
427                         status =
428                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
429                                                    &status_reg,
430                                                    &gpe_register_info->
431                                                    status_address);
432                         if (ACPI_FAILURE(status)) {
433                                 goto unlock_and_exit;
434                         }
435
436                         /* Read the Enable Register */
437
438                         status =
439                             acpi_hw_low_level_read(ACPI_GPE_REGISTER_WIDTH,
440                                                    &enable_reg,
441                                                    &gpe_register_info->
442                                                    enable_address);
443                         if (ACPI_FAILURE(status)) {
444                                 goto unlock_and_exit;
445                         }
446
447                         ACPI_DEBUG_PRINT((ACPI_DB_INTERRUPTS,
448                                           "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n",
449                                           gpe_register_info->base_gpe_number,
450                                           status_reg, enable_reg));
451
452                         /* Check if there is anything active at all in this register */
453
454                         enabled_status_byte = (u8) (status_reg & enable_reg);
455                         if (!enabled_status_byte) {
456
457                                 /* No active GPEs in this register, move on */
458
459                                 continue;
460                         }
461
462                         /* Now look at the individual GPEs in this byte register */
463
464                         for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
465
466                                 /* Examine one GPE bit */
467
468                                 if (enabled_status_byte & (1 << j)) {
469                                         /*
470                                          * Found an active GPE. Dispatch the event to a handler
471                                          * or method.
472                                          */
473                                         int_status |=
474                                             acpi_ev_gpe_dispatch(&gpe_block->
475                                                 event_info[((acpi_size) i * ACPI_GPE_REGISTER_WIDTH) + j], j + gpe_register_info->base_gpe_number);
476                                 }
477                         }
478                 }
479
480                 gpe_block = gpe_block->next;
481         }
482
483       unlock_and_exit:
484
485         acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
486         return (int_status);
487 }
488
489 /*******************************************************************************
490  *
491  * FUNCTION:    acpi_ev_asynch_execute_gpe_method
492  *
493  * PARAMETERS:  Context (gpe_event_info) - Info for this GPE
494  *
495  * RETURN:      None
496  *
497  * DESCRIPTION: Perform the actual execution of a GPE control method. This
498  *              function is called from an invocation of acpi_os_execute and
499  *              therefore does NOT execute at interrupt level - so that
500  *              the control method itself is not executed in the context of
501  *              an interrupt handler.
502  *
503  ******************************************************************************/
504 static void acpi_ev_asynch_enable_gpe(void *context);
505
506 static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context)
507 {
508         struct acpi_gpe_event_info *gpe_event_info = (void *)context;
509         acpi_status status;
510         struct acpi_gpe_event_info local_gpe_event_info;
511         struct acpi_evaluate_info *info;
512
513         ACPI_FUNCTION_TRACE(ev_asynch_execute_gpe_method);
514
515         status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
516         if (ACPI_FAILURE(status)) {
517                 return_VOID;
518         }
519
520         /* Must revalidate the gpe_number/gpe_block */
521
522         if (!acpi_ev_valid_gpe_event(gpe_event_info)) {
523                 status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
524                 return_VOID;
525         }
526
527         /* Set the GPE flags for return to enabled state */
528
529         (void)acpi_ev_enable_gpe(gpe_event_info, FALSE);
530
531         /*
532          * Take a snapshot of the GPE info for this level - we copy the
533          * info to prevent a race condition with remove_handler/remove_block.
534          */
535         ACPI_MEMCPY(&local_gpe_event_info, gpe_event_info,
536                     sizeof(struct acpi_gpe_event_info));
537
538         status = acpi_ut_release_mutex(ACPI_MTX_EVENTS);
539         if (ACPI_FAILURE(status)) {
540                 return_VOID;
541         }
542
543         /*
544          * Must check for control method type dispatch one more
545          * time to avoid race with ev_gpe_install_handler
546          */
547         if ((local_gpe_event_info.flags & ACPI_GPE_DISPATCH_MASK) ==
548             ACPI_GPE_DISPATCH_METHOD) {
549
550                 /* Allocate the evaluation information block */
551
552                 info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
553                 if (!info) {
554                         status = AE_NO_MEMORY;
555                 } else {
556                         /*
557                          * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the _Lxx/_Exx
558                          * control method that corresponds to this GPE
559                          */
560                         info->prefix_node =
561                             local_gpe_event_info.dispatch.method_node;
562                         info->flags = ACPI_IGNORE_RETURN_VALUE;
563
564                         status = acpi_ns_evaluate(info);
565                         ACPI_FREE(info);
566                 }
567
568                 if (ACPI_FAILURE(status)) {
569                         ACPI_EXCEPTION((AE_INFO, status,
570                                         "while evaluating GPE method [%4.4s]",
571                                         acpi_ut_get_node_name
572                                         (local_gpe_event_info.dispatch.
573                                          method_node)));
574                 }
575         }
576         /* Defer enabling of GPE until all notify handlers are done */
577         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_asynch_enable_gpe,
578                                 gpe_event_info);
579         return_VOID;
580 }
581
582 static void acpi_ev_asynch_enable_gpe(void *context)
583 {
584         struct acpi_gpe_event_info *gpe_event_info = context;
585         acpi_status status;
586         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
587             ACPI_GPE_LEVEL_TRIGGERED) {
588                 /*
589                  * GPE is level-triggered, we clear the GPE status bit after
590                  * handling the event.
591                  */
592                 status = acpi_hw_clear_gpe(gpe_event_info);
593                 if (ACPI_FAILURE(status)) {
594                         return_VOID;
595                 }
596         }
597
598         /* Enable this GPE */
599         (void)acpi_hw_write_gpe_enable_reg(gpe_event_info);
600         return_VOID;
601 }
602
603 /*******************************************************************************
604  *
605  * FUNCTION:    acpi_ev_gpe_dispatch
606  *
607  * PARAMETERS:  gpe_event_info  - Info for this GPE
608  *              gpe_number      - Number relative to the parent GPE block
609  *
610  * RETURN:      INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED
611  *
612  * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC)
613  *              or method (e.g. _Lxx/_Exx) handler.
614  *
615  *              This function executes at interrupt level.
616  *
617  ******************************************************************************/
618
619 u32
620 acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info, u32 gpe_number)
621 {
622         acpi_status status;
623
624         ACPI_FUNCTION_TRACE(ev_gpe_dispatch);
625
626         acpi_os_gpe_count(gpe_number);
627
628         /*
629          * If edge-triggered, clear the GPE status bit now.  Note that
630          * level-triggered events are cleared after the GPE is serviced.
631          */
632         if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
633             ACPI_GPE_EDGE_TRIGGERED) {
634                 status = acpi_hw_clear_gpe(gpe_event_info);
635                 if (ACPI_FAILURE(status)) {
636                         ACPI_EXCEPTION((AE_INFO, status,
637                                         "Unable to clear GPE[%2X]",
638                                         gpe_number));
639                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
640                 }
641         }
642
643         /*
644          * Dispatch the GPE to either an installed handler, or the control method
645          * associated with this GPE (_Lxx or _Exx). If a handler exists, we invoke
646          * it and do not attempt to run the method. If there is neither a handler
647          * nor a method, we disable this GPE to prevent further such pointless
648          * events from firing.
649          */
650         switch (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) {
651         case ACPI_GPE_DISPATCH_HANDLER:
652
653                 /*
654                  * Invoke the installed handler (at interrupt level)
655                  * Ignore return status for now.  TBD: leave GPE disabled on error?
656                  */
657                 (void)gpe_event_info->dispatch.handler->address(gpe_event_info->
658                                                                 dispatch.
659                                                                 handler->
660                                                                 context);
661
662                 /* It is now safe to clear level-triggered events. */
663
664                 if ((gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK) ==
665                     ACPI_GPE_LEVEL_TRIGGERED) {
666                         status = acpi_hw_clear_gpe(gpe_event_info);
667                         if (ACPI_FAILURE(status)) {
668                                 ACPI_EXCEPTION((AE_INFO, status,
669                                                 "Unable to clear GPE[%2X]",
670                                                 gpe_number));
671                                 return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
672                         }
673                 }
674                 break;
675
676         case ACPI_GPE_DISPATCH_METHOD:
677
678                 /*
679                  * Disable the GPE, so it doesn't keep firing before the method has a
680                  * chance to run (it runs asynchronously with interrupts enabled).
681                  */
682                 status = acpi_ev_disable_gpe(gpe_event_info);
683                 if (ACPI_FAILURE(status)) {
684                         ACPI_EXCEPTION((AE_INFO, status,
685                                         "Unable to disable GPE[%2X]",
686                                         gpe_number));
687                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
688                 }
689
690                 /*
691                  * Execute the method associated with the GPE
692                  * NOTE: Level-triggered GPEs are cleared after the method completes.
693                  */
694                 status = acpi_os_execute(OSL_GPE_HANDLER,
695                                          acpi_ev_asynch_execute_gpe_method,
696                                          gpe_event_info);
697                 if (ACPI_FAILURE(status)) {
698                         ACPI_EXCEPTION((AE_INFO, status,
699                                         "Unable to queue handler for GPE[%2X] - event disabled",
700                                         gpe_number));
701                 }
702                 break;
703
704         default:
705
706                 /* No handler or method to run! */
707
708                 ACPI_ERROR((AE_INFO,
709                             "No handler or method for GPE[%2X], disabling event",
710                             gpe_number));
711
712                 /*
713                  * Disable the GPE. The GPE will remain disabled until the ACPI
714                  * Core Subsystem is restarted, or a handler is installed.
715                  */
716                 status = acpi_ev_disable_gpe(gpe_event_info);
717                 if (ACPI_FAILURE(status)) {
718                         ACPI_EXCEPTION((AE_INFO, status,
719                                         "Unable to disable GPE[%2X]",
720                                         gpe_number));
721                         return_UINT32(ACPI_INTERRUPT_NOT_HANDLED);
722                 }
723                 break;
724         }
725
726         return_UINT32(ACPI_INTERRUPT_HANDLED);
727 }