[deliverable/linux.git] / drivers / acpi / acpica / evgpeutil.c

/******************************************************************************
 *
 * Module Name: evgpeutil - GPE utilities
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2015, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evgpeutil")

#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_walk_gpe_list
 *
 * PARAMETERS:  gpe_walk_callback   - Routine called for each GPE block
 *              context             - Value passed to callback
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Walk the GPE lists.
 *
 ******************************************************************************/
acpi_status
acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)
{
	struct acpi_gpe_block_info *gpe_block;
	struct acpi_gpe_xrupt_info *gpe_xrupt_info;
	acpi_status status = AE_OK;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_walk_gpe_list);

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Walk the interrupt level descriptor list */

	gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
	while (gpe_xrupt_info) {

		/* Walk all Gpe Blocks attached to this interrupt level */

		gpe_block = gpe_xrupt_info->gpe_block_list_head;
		while (gpe_block) {

			/* One callback per GPE block */

			status =
			    gpe_walk_callback(gpe_xrupt_info, gpe_block,
					      context);
			if (ACPI_FAILURE(status)) {
				if (status == AE_CTRL_END) {	/* Callback abort */
					status = AE_OK;
				}
				goto unlock_and_exit;
			}

			gpe_block = gpe_block->next;
		}

		gpe_xrupt_info = gpe_xrupt_info->next;
	}

unlock_and_exit:
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_get_gpe_device
 *
 * PARAMETERS:  GPE_WALK_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
 *              block device. NULL if the GPE is one of the FADT-defined GPEs.
 *
 ******************************************************************************/

acpi_status
acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
		       struct acpi_gpe_block_info *gpe_block, void *context)
{
	struct acpi_gpe_device_info *info = context;

	/* Increment Index by the number of GPEs in this block */

	info->next_block_base_index += gpe_block->gpe_count;

	if (info->index < info->next_block_base_index) {
		/*
		 * The GPE index is within this block, get the node. Leave the node
		 * NULL for the FADT-defined GPEs
		 */
		if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
			info->gpe_device = gpe_block->node;
		}

		info->status = AE_OK;
		return (AE_CTRL_END);
	}

	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_get_gpe_xrupt_block
 *
 * PARAMETERS:  interrupt_number            - Interrupt for a GPE block
 *              gpe_xrupt_block             - Where the block is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
 *              block per unique interrupt level used for GPEs. Should be
 *              called only when the GPE lists are semaphore locked and not
 *              subject to change.
 *
 ******************************************************************************/

acpi_status
acpi_ev_get_gpe_xrupt_block(u32 interrupt_number,
			    struct acpi_gpe_xrupt_info ** gpe_xrupt_block)
{
	struct acpi_gpe_xrupt_info *next_gpe_xrupt;
	struct acpi_gpe_xrupt_info *gpe_xrupt;
	acpi_status status;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);

	/* No need for lock since we are not changing any list elements here */

	next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
	while (next_gpe_xrupt) {
		if (next_gpe_xrupt->interrupt_number == interrupt_number) {
			*gpe_xrupt_block = next_gpe_xrupt;
			return_ACPI_STATUS(AE_OK);
		}

		next_gpe_xrupt = next_gpe_xrupt->next;
	}

	/* Not found, must allocate a new xrupt descriptor */

	gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
	if (!gpe_xrupt) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	gpe_xrupt->interrupt_number = interrupt_number;

	/* Install new interrupt descriptor with spin lock */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	if (acpi_gbl_gpe_xrupt_list_head) {
		next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
		while (next_gpe_xrupt->next) {
			next_gpe_xrupt = next_gpe_xrupt->next;
		}

		next_gpe_xrupt->next = gpe_xrupt;
		gpe_xrupt->previous = next_gpe_xrupt;
	} else {
		acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
	}

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	/* Install new interrupt handler if not SCI_INT */

	if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
		status = acpi_os_install_interrupt_handler(interrupt_number,
							   acpi_ev_gpe_xrupt_handler,
							   gpe_xrupt);
		if (ACPI_FAILURE(status)) {
			ACPI_EXCEPTION((AE_INFO, status,
					"Could not install GPE interrupt handler at level 0x%X",
					interrupt_number));
			return_ACPI_STATUS(status);
		}
	}

	*gpe_xrupt_block = gpe_xrupt;
	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_delete_gpe_xrupt
 *
 * PARAMETERS:  gpe_xrupt       - A GPE interrupt info block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
 *              interrupt handler if not the SCI interrupt.
 *
 ******************************************************************************/

acpi_status acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
{
	acpi_status status;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);

	/* We never want to remove the SCI interrupt handler */

	if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
		gpe_xrupt->gpe_block_list_head = NULL;
		return_ACPI_STATUS(AE_OK);
	}

	/* Disable this interrupt */

	status =
	    acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
					     acpi_ev_gpe_xrupt_handler);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Unlink the interrupt block with lock */

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	if (gpe_xrupt->previous) {
		gpe_xrupt->previous->next = gpe_xrupt->next;
	} else {
		/* No previous, update list head */

		acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
	}

	if (gpe_xrupt->next) {
		gpe_xrupt->next->previous = gpe_xrupt->previous;
	}
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	/* Free the block */

	ACPI_FREE(gpe_xrupt);
	return_ACPI_STATUS(AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_delete_gpe_handlers
 *
 * PARAMETERS:  gpe_xrupt_info      - GPE Interrupt info
 *              gpe_block           - Gpe Block info
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Delete all Handler objects found in the GPE data structs.
 *              Used only prior to termination.
 *
 ******************************************************************************/

acpi_status
acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
			    struct acpi_gpe_block_info *gpe_block,
			    void *context)
{
	struct acpi_gpe_event_info *gpe_event_info;
	struct acpi_gpe_notify_info *notify;
	struct acpi_gpe_notify_info *next;
	u32 i;
	u32 j;

	ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);

	/* Examine each GPE Register within the block */

	for (i = 0; i < gpe_block->register_count; i++) {

		/* Now look at the individual GPEs in this byte register */

		for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
			gpe_event_info = &gpe_block->event_info[((acpi_size) i *
								 ACPI_GPE_REGISTER_WIDTH)
								+ j];

			if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
			    ACPI_GPE_DISPATCH_HANDLER) {

				/* Delete an installed handler block */

				ACPI_FREE(gpe_event_info->dispatch.handler);
				gpe_event_info->dispatch.handler = NULL;
				gpe_event_info->flags &=
				    ~ACPI_GPE_DISPATCH_MASK;
			} else if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)
				   == ACPI_GPE_DISPATCH_NOTIFY) {

				/* Delete the implicit notification device list */

				notify = gpe_event_info->dispatch.notify_list;
				while (notify) {
					next = notify->next;
					ACPI_FREE(notify);
					notify = next;
				}
				gpe_event_info->dispatch.notify_list = NULL;
				gpe_event_info->flags &=
				    ~ACPI_GPE_DISPATCH_MASK;
			}
		}
	}

	return_ACPI_STATUS(AE_OK);
}

#endif				/* !ACPI_REDUCED_HARDWARE */
Commit	Line	Data
3fe50208 BM	1	/******************************************************************************
	2	*
	3	* Module Name: evgpeutil - GPE utilities
	4	*
	5	*****************************************************************************/
	6
	7	/*
82a80941	8	* Copyright (C) 2000 - 2015, Intel Corp.
3fe50208 BM	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
	48	#define _COMPONENT ACPI_EVENTS
	49	ACPI_MODULE_NAME("evgpeutil")
	50
33620c54	51	#if (!ACPI_REDUCED_HARDWARE) /* Entire module */
3fe50208 BM	52	/*******************************************************************************
	53	*
	54	* FUNCTION: acpi_ev_walk_gpe_list
	55	*
	56	* PARAMETERS: gpe_walk_callback - Routine called for each GPE block
ba494bee	57	* context - Value passed to callback
3fe50208 BM	58	*
	59	* RETURN: Status
	60	*
	61	* DESCRIPTION: Walk the GPE lists.
	62	*
	63	******************************************************************************/
	64	acpi_status
	65	acpi_ev_walk_gpe_list(acpi_gpe_callback gpe_walk_callback, void *context)
	66	{
	67	struct acpi_gpe_block_info *gpe_block;
	68	struct acpi_gpe_xrupt_info *gpe_xrupt_info;
	69	acpi_status status = AE_OK;
	70	acpi_cpu_flags flags;
	71
	72	ACPI_FUNCTION_TRACE(ev_walk_gpe_list);
	73
	74	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	75
	76	/* Walk the interrupt level descriptor list */
	77
	78	gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
	79	while (gpe_xrupt_info) {
	80
	81	/* Walk all Gpe Blocks attached to this interrupt level */
	82
	83	gpe_block = gpe_xrupt_info->gpe_block_list_head;
	84	while (gpe_block) {
	85
	86	/* One callback per GPE block */
	87
	88	status =
	89	gpe_walk_callback(gpe_xrupt_info, gpe_block,
	90	context);
	91	if (ACPI_FAILURE(status)) {
	92	if (status == AE_CTRL_END) { /* Callback abort */
	93	status = AE_OK;
	94	}
	95	goto unlock_and_exit;
	96	}
	97
	98	gpe_block = gpe_block->next;
	99	}
	100
	101	gpe_xrupt_info = gpe_xrupt_info->next;
	102	}
	103
10622bf8	104	unlock_and_exit:
3fe50208 BM	105	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	106	return_ACPI_STATUS(status);
	107	}
	108
3cfd53d5 LM	109	/*******************************************************************************
	110	*
	111	* FUNCTION: acpi_ev_get_gpe_device
	112	*
	113	* PARAMETERS: GPE_WALK_CALLBACK
	114	*
	115	* RETURN: Status
	116	*
	117	* DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
	118	* block device. NULL if the GPE is one of the FADT-defined GPEs.
	119	*
	120	******************************************************************************/
	121
	122	acpi_status
b18da580 LZ	123	acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
b18da580 LZ	124	struct acpi_gpe_block_info gpe_block, void context)
3cfd53d5 LM	125	{
	126	struct acpi_gpe_device_info *info = context;
	127
	128	/* Increment Index by the number of GPEs in this block */
	129
	130	info->next_block_base_index += gpe_block->gpe_count;
	131
	132	if (info->index < info->next_block_base_index) {
	133	/*
	134	* The GPE index is within this block, get the node. Leave the node
	135	* NULL for the FADT-defined GPEs
	136	*/
	137	if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
	138	info->gpe_device = gpe_block->node;
	139	}
	140
	141	info->status = AE_OK;
	142	return (AE_CTRL_END);
	143	}
	144
	145	return (AE_OK);
	146	}
	147
3fe50208 BM	148	/*******************************************************************************
	149	*
	150	* FUNCTION: acpi_ev_get_gpe_xrupt_block
	151	*
a2fd4b4b	152	* PARAMETERS: interrupt_number - Interrupt for a GPE block
4bec3d80	153	* gpe_xrupt_block - Where the block is returned
3fe50208	154	*
4bec3d80	155	* RETURN: Status
3fe50208 BM	156	*
	157	* DESCRIPTION: Get or Create a GPE interrupt block. There is one interrupt
	158	* block per unique interrupt level used for GPEs. Should be
	159	* called only when the GPE lists are semaphore locked and not
	160	* subject to change.
	161	*
	162	******************************************************************************/
	163
4bec3d80 BM	164	acpi_status
	165	acpi_ev_get_gpe_xrupt_block(u32 interrupt_number,
	166	struct acpi_gpe_xrupt_info ** gpe_xrupt_block)
3fe50208 BM	167	{
	168	struct acpi_gpe_xrupt_info *next_gpe_xrupt;
	169	struct acpi_gpe_xrupt_info *gpe_xrupt;
	170	acpi_status status;
	171	acpi_cpu_flags flags;
	172
	173	ACPI_FUNCTION_TRACE(ev_get_gpe_xrupt_block);
	174
	175	/* No need for lock since we are not changing any list elements here */
	176
	177	next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
	178	while (next_gpe_xrupt) {
	179	if (next_gpe_xrupt->interrupt_number == interrupt_number) {
4bec3d80 BM	180	*gpe_xrupt_block = next_gpe_xrupt;
4bec3d80 BM	181	return_ACPI_STATUS(AE_OK);
3fe50208 BM	182	}
	183
	184	next_gpe_xrupt = next_gpe_xrupt->next;
	185	}
	186
	187	/* Not found, must allocate a new xrupt descriptor */
	188
	189	gpe_xrupt = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_xrupt_info));
	190	if (!gpe_xrupt) {
4bec3d80	191	return_ACPI_STATUS(AE_NO_MEMORY);
3fe50208 BM	192	}
	193
	194	gpe_xrupt->interrupt_number = interrupt_number;
	195
	196	/* Install new interrupt descriptor with spin lock */
	197
	198	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	199	if (acpi_gbl_gpe_xrupt_list_head) {
	200	next_gpe_xrupt = acpi_gbl_gpe_xrupt_list_head;
	201	while (next_gpe_xrupt->next) {
	202	next_gpe_xrupt = next_gpe_xrupt->next;
	203	}
	204
	205	next_gpe_xrupt->next = gpe_xrupt;
	206	gpe_xrupt->previous = next_gpe_xrupt;
	207	} else {
	208	acpi_gbl_gpe_xrupt_list_head = gpe_xrupt;
	209	}
4bec3d80	210
3fe50208 BM	211	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	212
	213	/* Install new interrupt handler if not SCI_INT */
	214
	215	if (interrupt_number != acpi_gbl_FADT.sci_interrupt) {
	216	status = acpi_os_install_interrupt_handler(interrupt_number,
	217	acpi_ev_gpe_xrupt_handler,
	218	gpe_xrupt);
	219	if (ACPI_FAILURE(status)) {
4bec3d80 BM	220	ACPI_EXCEPTION((AE_INFO, status,
	221	"Could not install GPE interrupt handler at level 0x%X",
	222	interrupt_number));
	223	return_ACPI_STATUS(status);
3fe50208 BM	224	}
	225	}
	226
4bec3d80 BM	227	*gpe_xrupt_block = gpe_xrupt;
4bec3d80 BM	228	return_ACPI_STATUS(AE_OK);
3fe50208 BM	229	}
	230
	231	/*******************************************************************************
	232	*
	233	* FUNCTION: acpi_ev_delete_gpe_xrupt
	234	*
	235	* PARAMETERS: gpe_xrupt - A GPE interrupt info block
	236	*
	237	* RETURN: Status
	238	*
	239	* DESCRIPTION: Remove and free a gpe_xrupt block. Remove an associated
	240	* interrupt handler if not the SCI interrupt.
	241	*
	242	******************************************************************************/
	243
	244	acpi_status acpi_ev_delete_gpe_xrupt(struct acpi_gpe_xrupt_info *gpe_xrupt)
	245	{
	246	acpi_status status;
	247	acpi_cpu_flags flags;
	248
	249	ACPI_FUNCTION_TRACE(ev_delete_gpe_xrupt);
	250
	251	/* We never want to remove the SCI interrupt handler */
	252
	253	if (gpe_xrupt->interrupt_number == acpi_gbl_FADT.sci_interrupt) {
	254	gpe_xrupt->gpe_block_list_head = NULL;
	255	return_ACPI_STATUS(AE_OK);
	256	}
	257
	258	/* Disable this interrupt */
	259
	260	status =
	261	acpi_os_remove_interrupt_handler(gpe_xrupt->interrupt_number,
	262	acpi_ev_gpe_xrupt_handler);
	263	if (ACPI_FAILURE(status)) {
	264	return_ACPI_STATUS(status);
	265	}
	266
	267	/* Unlink the interrupt block with lock */
	268
	269	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
	270	if (gpe_xrupt->previous) {
	271	gpe_xrupt->previous->next = gpe_xrupt->next;
	272	} else {
	273	/* No previous, update list head */
	274
	275	acpi_gbl_gpe_xrupt_list_head = gpe_xrupt->next;
	276	}
	277
	278	if (gpe_xrupt->next) {
	279	gpe_xrupt->next->previous = gpe_xrupt->previous;
	280	}
	281	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	282
	283	/* Free the block */
	284
	285	ACPI_FREE(gpe_xrupt);
	286	return_ACPI_STATUS(AE_OK);
	287	}
	288
	289	/*******************************************************************************
	290	*
	291	* FUNCTION: acpi_ev_delete_gpe_handlers
	292	*
293	* PARAMETERS: gpe_xrupt_info - GPE Interrupt info
294	* gpe_block - Gpe Block info
295	*
296	* RETURN: Status
297	*
298	* DESCRIPTION: Delete all Handler objects found in the GPE data structs.
299	* Used only prior to termination.
300	*
301	******************************************************************************/
302
303	acpi_status
304	acpi_ev_delete_gpe_handlers(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
305	struct acpi_gpe_block_info *gpe_block,
306	void *context)
307	{
308	struct acpi_gpe_event_info *gpe_event_info;
5816b343 BM	309	struct acpi_gpe_notify_info *notify;
5816b343 BM	310	struct acpi_gpe_notify_info *next;
3fe50208 BM	311	u32 i;
	312	u32 j;
	313
	314	ACPI_FUNCTION_TRACE(ev_delete_gpe_handlers);
	315
	316	/* Examine each GPE Register within the block */
	317
	318	for (i = 0; i < gpe_block->register_count; i++) {
	319
	320	/* Now look at the individual GPEs in this byte register */
	321
	322	for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
	323	gpe_event_info = &gpe_block->event_info[((acpi_size) i *
	324	ACPI_GPE_REGISTER_WIDTH)
	325	+ j];
	326
7c43312a	327	if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
3fe50208	328	ACPI_GPE_DISPATCH_HANDLER) {
5816b343 BM	329
	330	/* Delete an installed handler block */
	331
3fe50208 BM	332	ACPI_FREE(gpe_event_info->dispatch.handler);
	333	gpe_event_info->dispatch.handler = NULL;
	334	gpe_event_info->flags &=
	335	~ACPI_GPE_DISPATCH_MASK;
7c43312a LZ	336	} else if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags)
7c43312a LZ	337	== ACPI_GPE_DISPATCH_NOTIFY) {
5816b343 BM	338
	339	/* Delete the implicit notification device list */
	340
	341	notify = gpe_event_info->dispatch.notify_list;
	342	while (notify) {
	343	next = notify->next;
	344	ACPI_FREE(notify);
	345	notify = next;
	346	}
	347	gpe_event_info->dispatch.notify_list = NULL;
	348	gpe_event_info->flags &=
	349	~ACPI_GPE_DISPATCH_MASK;
3fe50208 BM	350	}
	351	}
	352	}
	353
	354	return_ACPI_STATUS(AE_OK);
	355	}
33620c54 BM	356
33620c54 BM	357	#endif /* !ACPI_REDUCED_HARDWARE */