ACPI: Use GPE reference counting to support shared GPEs

ACPI GPEs may map to multiple devices.  The current GPE interface
only provides a mechanism for enabling and disabling GPEs, making
it difficult to change the state of GPEs at runtime without extensive
cooperation between devices.

Add an API to allow devices to indicate whether or not they want
their device's GPE to be enabled for both runtime and wakeup events.

Remove the old GPE type handling entirely, which gets rid of various
quirks, like the implicit disabling with GPE type setting. This
requires a small amount of rework in order to ensure that non-wake
GPEs are enabled by default to preserve existing behaviour.

Based on patches from Matthew Garrett <mjg@redhat.com>.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

11 files changed, 175 insertions, 304 deletions

diff --git a/drivers/acpi/acpica/acevents.h b/drivers/acpi/acpica/acevents.h
index 0bba148..197aa4f 100644
--- a/drivers/acpi/acpica/acevents.h
+++ b/drivers/acpi/acpica/acevents.h
@@ -76,8 +76,7 @@ acpi_ev_queue_notify_request(struct acpi_namespace_node *node,
  * evgpe - GPE handling and dispatch
  */
 acpi_status
-acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info,
-				u8 type);
+acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info);
 
 acpi_status
 acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info,
@@ -122,9 +121,6 @@ acpi_ev_gpe_dispatch(struct acpi_gpe_event_info *gpe_event_info,
 u32 acpi_ev_gpe_detect(struct acpi_gpe_xrupt_info *gpe_xrupt_list);
 
 acpi_status
-acpi_ev_set_gpe_type(struct acpi_gpe_event_info *gpe_event_info, u8 type);
-
-acpi_status
 acpi_ev_check_for_wake_only_gpe(struct acpi_gpe_event_info *gpe_event_info);
 
 acpi_status acpi_ev_gpe_initialize(void);
diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h
index 81e64f4..13cb80c 100644
--- a/drivers/acpi/acpica/aclocal.h
+++ b/drivers/acpi/acpica/aclocal.h
@@ -426,6 +426,8 @@ struct acpi_gpe_event_info {
 	struct acpi_gpe_register_info *register_info;	/* Backpointer to register info */
 	u8 flags;		/* Misc info about this GPE */
 	u8 gpe_number;		/* This GPE */
+	u8 runtime_count;
+	u8 wakeup_count;
 };
 
 /* Information about a GPE register pair, one per each status/enable pair in an array */
diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c
index afacf44..30ca3a3 100644
--- a/drivers/acpi/acpica/evgpe.c
+++ b/drivers/acpi/acpica/evgpe.c
@@ -54,54 +54,9 @@ static void ACPI_SYSTEM_XFACE acpi_ev_asynch_execute_gpe_method(void *context);
 
 /*******************************************************************************
  *
- * FUNCTION:    acpi_ev_set_gpe_type
- *
- * PARAMETERS:  gpe_event_info          - GPE to set
- *              Type                    - New type
- *
- * RETURN:      Status
- *
- * DESCRIPTION: Sets the new type for the GPE (wake, run, or wake/run)
- *
- ******************************************************************************/
-
-acpi_status
-acpi_ev_set_gpe_type(struct acpi_gpe_event_info *gpe_event_info, u8 type)
-{
-	acpi_status status;
-
-	ACPI_FUNCTION_TRACE(ev_set_gpe_type);
-
-	/* Validate type and update register enable masks */
-
-	switch (type) {
-	case ACPI_GPE_TYPE_WAKE:
-	case ACPI_GPE_TYPE_RUNTIME:
-	case ACPI_GPE_TYPE_WAKE_RUN:
-		break;
-
-	default:
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
-
-	/* Disable the GPE if currently enabled */
-
-	status = acpi_ev_disable_gpe(gpe_event_info);
-
-	/* Clear the type bits and insert the new Type */
-
-	gpe_event_info->flags &= ~ACPI_GPE_TYPE_MASK;
-	gpe_event_info->flags |= type;
-	return_ACPI_STATUS(status);
-}
-
-/*******************************************************************************
- *
  * FUNCTION:    acpi_ev_update_gpe_enable_masks
  *
  * PARAMETERS:  gpe_event_info          - GPE to update
- *              Type                    - What to do: ACPI_GPE_DISABLE or
- *                                        ACPI_GPE_ENABLE
  *
  * RETURN:      Status
  *
@@ -110,8 +65,7 @@ acpi_ev_set_gpe_type(struct acpi_gpe_event_info *gpe_event_info, u8 type)
  ******************************************************************************/
 
 acpi_status
-acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info,
-				u8 type)
+acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info)
 {
 	struct acpi_gpe_register_info *gpe_register_info;
 	u8 register_bit;
@@ -127,37 +81,14 @@ acpi_ev_update_gpe_enable_masks(struct acpi_gpe_event_info *gpe_event_info,
 	    (1 <<
 	     (gpe_event_info->gpe_number - gpe_register_info->base_gpe_number));
 
-	/* 1) Disable case. Simply clear all enable bits */
-
-	if (type == ACPI_GPE_DISABLE) {
-		ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
-			       register_bit);
-		ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
-		return_ACPI_STATUS(AE_OK);
-	}
-
-	/* 2) Enable case. Set/Clear the appropriate enable bits */
+	ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake, register_bit);
+	ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
 
-	switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
-	case ACPI_GPE_TYPE_WAKE:
-		ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
-		ACPI_CLEAR_BIT(gpe_register_info->enable_for_run, register_bit);
-		break;
-
-	case ACPI_GPE_TYPE_RUNTIME:
-		ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
-			       register_bit);
+	if (gpe_event_info->runtime_count)
 		ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
-		break;
 
-	case ACPI_GPE_TYPE_WAKE_RUN:
+	if (gpe_event_info->wakeup_count)
 		ACPI_SET_BIT(gpe_register_info->enable_for_wake, register_bit);
-		ACPI_SET_BIT(gpe_register_info->enable_for_run, register_bit);
-		break;
-
-	default:
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
-	}
 
 	return_ACPI_STATUS(AE_OK);
 }
@@ -186,47 +117,20 @@ acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info,
 
 	/* Make sure HW enable masks are updated */
 
-	status =
-	    acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_ENABLE);
-	if (ACPI_FAILURE(status)) {
+	status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
+	if (ACPI_FAILURE(status))
 		return_ACPI_STATUS(status);
-	}
 
 	/* Mark wake-enabled or HW enable, or both */
 
-	switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
-	case ACPI_GPE_TYPE_WAKE:
-
-		ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
-		break;
-
-	case ACPI_GPE_TYPE_WAKE_RUN:
-
-		ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
-
-		/*lint -fallthrough */
-
-	case ACPI_GPE_TYPE_RUNTIME:
-
-		ACPI_SET_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
-
-		if (write_to_hardware) {
-
-			/* Clear the GPE (of stale events), then enable it */
-
-			status = acpi_hw_clear_gpe(gpe_event_info);
-			if (ACPI_FAILURE(status)) {
-				return_ACPI_STATUS(status);
-			}
-
-			/* Enable the requested runtime GPE */
-
-			status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
-		}
-		break;
+	if (gpe_event_info->runtime_count && write_to_hardware) {
+		/* Clear the GPE (of stale events), then enable it */
+		status = acpi_hw_clear_gpe(gpe_event_info);
+		if (ACPI_FAILURE(status))
+			return_ACPI_STATUS(status);
 
-	default:
-		return_ACPI_STATUS(AE_BAD_PARAMETER);
+		/* Enable the requested runtime GPE */
+		status = acpi_hw_write_gpe_enable_reg(gpe_event_info);
 	}
 
 	return_ACPI_STATUS(AE_OK);
@@ -252,34 +156,9 @@ acpi_status acpi_ev_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 
 	/* Make sure HW enable masks are updated */
 
-	status =
-	    acpi_ev_update_gpe_enable_masks(gpe_event_info, ACPI_GPE_DISABLE);
-	if (ACPI_FAILURE(status)) {
+	status = acpi_ev_update_gpe_enable_masks(gpe_event_info);
+	if (ACPI_FAILURE(status))
 		return_ACPI_STATUS(status);
-	}
-
-	/* Clear the appropriate enabled flags for this GPE */
-
-	switch (gpe_event_info->flags & ACPI_GPE_TYPE_MASK) {
-	case ACPI_GPE_TYPE_WAKE:
-		ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
-		break;
-
-	case ACPI_GPE_TYPE_WAKE_RUN:
-		ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_WAKE_ENABLED);
-
-		/* fallthrough */
-
-	case ACPI_GPE_TYPE_RUNTIME:
-
-		/* Disable the requested runtime GPE */
-
-		ACPI_CLEAR_BIT(gpe_event_info->flags, ACPI_GPE_RUN_ENABLED);
-		break;
-
-	default:
-		break;
-	}
 
 	/*
 	 * Even if we don't know the GPE type, make sure that we always
diff --git a/drivers/acpi/acpica/evgpeblk.c b/drivers/acpi/acpica/evgpeblk.c
index 2479209..3d4c4ac 100644
--- a/drivers/acpi/acpica/evgpeblk.c
+++ b/drivers/acpi/acpica/evgpeblk.c
@@ -258,7 +258,6 @@ acpi_ev_save_method_info(acpi_handle obj_handle,
 	u32 gpe_number;
 	char name[ACPI_NAME_SIZE + 1];
 	u8 type;
-	acpi_status status;
 
 	ACPI_FUNCTION_TRACE(ev_save_method_info);
 
@@ -325,26 +324,20 @@ acpi_ev_save_method_info(acpi_handle obj_handle,
 
 	/*
 	 * Now we can add this information to the gpe_event_info block for use
-	 * during dispatch of this GPE. Default type is RUNTIME, although this may
-	 * change when the _PRW methods are executed later.
+	 * during dispatch of this GPE.
 	 */
 	gpe_event_info =
 	    &gpe_block->event_info[gpe_number - gpe_block->block_base_number];
 
-	gpe_event_info->flags = (u8)
-	    (type | ACPI_GPE_DISPATCH_METHOD | ACPI_GPE_TYPE_RUNTIME);
+	gpe_event_info->flags = (u8) (type | ACPI_GPE_DISPATCH_METHOD);
 
 	gpe_event_info->dispatch.method_node =
 	    (struct acpi_namespace_node *)obj_handle;
 
-	/* Update enable mask, but don't enable the HW GPE as of yet */
-
-	status = acpi_ev_enable_gpe(gpe_event_info, FALSE);
-
 	ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
 			  "Registered GPE method %s as GPE number 0x%.2X\n",
 			  name, gpe_number));
-	return_ACPI_STATUS(status);
+	return_ACPI_STATUS(AE_OK);
 }
 
 /*******************************************************************************
@@ -454,20 +447,7 @@ acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
 							gpe_block->
 							block_base_number];
 
-		/* Mark GPE for WAKE-ONLY but WAKE_DISABLED */
-
-		gpe_event_info->flags &=
-		    ~(ACPI_GPE_WAKE_ENABLED | ACPI_GPE_RUN_ENABLED);
-
-		status =
-		    acpi_ev_set_gpe_type(gpe_event_info, ACPI_GPE_TYPE_WAKE);
-		if (ACPI_FAILURE(status)) {
-			goto cleanup;
-		}
-
-		status =
-		    acpi_ev_update_gpe_enable_masks(gpe_event_info,
-						    ACPI_GPE_DISABLE);
+		gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
 	}
 
       cleanup:
@@ -989,7 +969,6 @@ acpi_status
 acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
 			     struct acpi_gpe_block_info *gpe_block)
 {
-	acpi_status status;
 	struct acpi_gpe_event_info *gpe_event_info;
 	struct acpi_gpe_walk_info gpe_info;
 	u32 wake_gpe_count;
@@ -1019,42 +998,50 @@ acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
 		gpe_info.gpe_block = gpe_block;
 		gpe_info.gpe_device = gpe_device;
 
-		status =
-		    acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+		acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
 					   ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
 					   acpi_ev_match_prw_and_gpe, NULL,
 					   &gpe_info, NULL);
 	}
 
 	/*
-	 * Enable all GPEs in this block that have these attributes:
-	 * 1) are "runtime" or "run/wake" GPEs, and
-	 * 2) have a corresponding _Lxx or _Exx method
-	 *
-	 * Any other GPEs within this block must be enabled via the
-	 * acpi_enable_gpe() external interface.
+	 * Enable all GPEs that have a corresponding method and aren't
+	 * capable of generating wakeups. Any other GPEs within this block
+	 * must be enabled via the acpi_enable_gpe() interface.
 	 */
 	wake_gpe_count = 0;
 	gpe_enabled_count = 0;
+	if (gpe_device == acpi_gbl_fadt_gpe_device)
+		gpe_device = NULL;
 
 	for (i = 0; i < gpe_block->register_count; i++) {
-		for (j = 0; j < 8; j++) {
+		for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) {
+			acpi_status status;
+			acpi_size gpe_index;
+			int gpe_number;
 
 			/* Get the info block for this particular GPE */
+			gpe_index = (acpi_size)i * ACPI_GPE_REGISTER_WIDTH + j;
+			gpe_event_info = &gpe_block->event_info[gpe_index];
 
-			gpe_event_info = &gpe_block->event_info[((acpi_size) i *
-								 ACPI_GPE_REGISTER_WIDTH)
-								+ j];
-
-			if (((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
-			     ACPI_GPE_DISPATCH_METHOD) &&
-			    (gpe_event_info->flags & ACPI_GPE_TYPE_RUNTIME)) {
-				gpe_enabled_count++;
-			}
-
-			if (gpe_event_info->flags & ACPI_GPE_TYPE_WAKE) {
+			if (gpe_event_info->flags & ACPI_GPE_CAN_WAKE) {
 				wake_gpe_count++;
+				if (acpi_gbl_leave_wake_gpes_disabled)
+					continue;
 			}
+
+			if (!(gpe_event_info->flags & ACPI_GPE_DISPATCH_METHOD))
+				continue;
+
+			gpe_number = gpe_index + gpe_block->block_base_number;
+			status = acpi_enable_gpe(gpe_device, gpe_number,
+						ACPI_GPE_TYPE_RUNTIME);
+			if (ACPI_FAILURE(status))
+				ACPI_ERROR((AE_INFO,
+						"Failed to enable GPE %02X\n",
+						gpe_number));
+			else
+				gpe_enabled_count++;
 		}
 	}
 
@@ -1062,15 +1049,7 @@ acpi_ev_initialize_gpe_block(struct acpi_namespace_node *gpe_device,
 			  "Found %u Wake, Enabled %u Runtime GPEs in this block\n",
 			  wake_gpe_count, gpe_enabled_count));
 
-	/* Enable all valid runtime GPEs found above */
-
-	status = acpi_hw_enable_runtime_gpe_block(NULL, gpe_block, NULL);
-	if (ACPI_FAILURE(status)) {
-		ACPI_ERROR((AE_INFO, "Could not enable GPEs in GpeBlock %p",
-			    gpe_block));
-	}
-
-	return_ACPI_STATUS(status);
+	return_ACPI_STATUS(AE_OK);
 }
 
 /*******************************************************************************
diff --git a/drivers/acpi/acpica/evxface.c b/drivers/acpi/acpica/evxface.c
index 2fe0809..166cbfe 100644
--- a/drivers/acpi/acpica/evxface.c
+++ b/drivers/acpi/acpica/evxface.c
@@ -617,13 +617,6 @@ acpi_install_gpe_handler(acpi_handle gpe_device,
 	handler->context = context;
 	handler->method_node = gpe_event_info->dispatch.method_node;
 
-	/* Disable the GPE before installing the handler */
-
-	status = acpi_ev_disable_gpe(gpe_event_info);
-	if (ACPI_FAILURE(status)) {
-		goto unlock_and_exit;
-	}
-
 	/* Install the handler */
 
 	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
@@ -707,13 +700,6 @@ acpi_remove_gpe_handler(acpi_handle gpe_device,
 		goto unlock_and_exit;
 	}
 
-	/* Disable the GPE before removing the handler */
-
-	status = acpi_ev_disable_gpe(gpe_event_info);
-	if (ACPI_FAILURE(status)) {
-		goto unlock_and_exit;
-	}
-
 	/* Make sure all deferred tasks are completed */
 
 	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
diff --git a/drivers/acpi/acpica/evxfevnt.c b/drivers/acpi/acpica/evxfevnt.c
index eed7a38..1aea1a7 100644
--- a/drivers/acpi/acpica/evxfevnt.c
+++ b/drivers/acpi/acpica/evxfevnt.c
@@ -201,23 +201,27 @@ ACPI_EXPORT_SYMBOL(acpi_enable_event)
 
 /*******************************************************************************
  *
- * FUNCTION:    acpi_set_gpe_type
+ * FUNCTION:    acpi_set_gpe
  *
  * PARAMETERS:  gpe_device      - Parent GPE Device
  *              gpe_number      - GPE level within the GPE block
- *              Type            - New GPE type
+ *              action          - Enable or disable
+ *                                Called from ISR or not
  *
  * RETURN:      Status
  *
- * DESCRIPTION: Set the type of an individual GPE
+ * DESCRIPTION: Enable or disable an ACPI event (general purpose)
  *
  ******************************************************************************/
-acpi_status acpi_set_gpe_type(acpi_handle gpe_device, u32 gpe_number, u8 type)
+acpi_status acpi_set_gpe(acpi_handle gpe_device, u32 gpe_number, u8 action)
 {
 	acpi_status status = AE_OK;
+	acpi_cpu_flags flags;
 	struct acpi_gpe_event_info *gpe_event_info;
 
-	ACPI_FUNCTION_TRACE(acpi_set_gpe_type);
+	ACPI_FUNCTION_TRACE(acpi_set_gpe);
+
+	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
 
 	/* Ensure that we have a valid GPE number */
 
@@ -227,19 +231,29 @@ acpi_status acpi_set_gpe_type(acpi_handle gpe_device, u32 gpe_number, u8 type)
 		goto unlock_and_exit;
 	}
 
-	if ((gpe_event_info->flags & ACPI_GPE_TYPE_MASK) == type) {
-		return_ACPI_STATUS(AE_OK);
-	}
+	/* Perform the action */
+
+	switch (action) {
+	case ACPI_GPE_ENABLE:
+		status = acpi_ev_enable_gpe(gpe_event_info, TRUE);
+		break;
 
-	/* Set the new type (will disable GPE if currently enabled) */
+	case ACPI_GPE_DISABLE:
+		status = acpi_ev_disable_gpe(gpe_event_info);
+		break;
 
-	status = acpi_ev_set_gpe_type(gpe_event_info, type);
+	default:
+		ACPI_ERROR((AE_INFO, "Invalid action\n"));
+		status = AE_BAD_PARAMETER;
+		break;
+	}
 
       unlock_and_exit:
+	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 	return_ACPI_STATUS(status);
 }
 
-ACPI_EXPORT_SYMBOL(acpi_set_gpe_type)
+ACPI_EXPORT_SYMBOL(acpi_set_gpe)
 
 /*******************************************************************************
  *
@@ -247,15 +261,14 @@ ACPI_EXPORT_SYMBOL(acpi_set_gpe_type)
  *
  * PARAMETERS:  gpe_device      - Parent GPE Device
  *              gpe_number      - GPE level within the GPE block
- *              Flags           - Just enable, or also wake enable?
- *                                Called from ISR or not
+ *              type            - Purpose the GPE will be used for
  *
  * RETURN:      Status
  *
- * DESCRIPTION: Enable an ACPI event (general purpose)
+ * DESCRIPTION: Take a reference to a GPE and enable it if necessary
  *
  ******************************************************************************/
-acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
+acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 type)
 {
 	acpi_status status = AE_OK;
 	acpi_cpu_flags flags;
@@ -273,15 +286,32 @@ acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
 		goto unlock_and_exit;
 	}
 
-	/* Perform the enable */
+	if (type & ACPI_GPE_TYPE_RUNTIME) {
+		if (++gpe_event_info->runtime_count == 1)
+			status = acpi_ev_enable_gpe(gpe_event_info, TRUE);
 
-	status = acpi_ev_enable_gpe(gpe_event_info, TRUE);
+		if (ACPI_FAILURE(status))
+			gpe_event_info->runtime_count--;
+	}
 
-      unlock_and_exit:
+	if (type & ACPI_GPE_TYPE_WAKE) {
+		if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
+			status = AE_BAD_PARAMETER;
+			goto unlock_and_exit;
+		}
+
+		/*
+		 * Wake-up GPEs are only enabled right prior to putting the
+		 * system into a sleep state.
+		 */
+		if (++gpe_event_info->wakeup_count == 1)
+			acpi_ev_update_gpe_enable_masks(gpe_event_info);
+	}
+
+unlock_and_exit:
 	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 	return_ACPI_STATUS(status);
 }
-
 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
 
 /*******************************************************************************
@@ -290,15 +320,14 @@ ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
  *
  * PARAMETERS:  gpe_device      - Parent GPE Device
  *              gpe_number      - GPE level within the GPE block
- *              Flags           - Just disable, or also wake disable?
- *                                Called from ISR or not
+ *              type            - Purpose the GPE won't be used for any more
  *
  * RETURN:      Status
  *
- * DESCRIPTION: Disable an ACPI event (general purpose)
+ * DESCRIPTION: Release a reference to a GPE and disable it if necessary
  *
  ******************************************************************************/
-acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
+acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number, u8 type)
 {
 	acpi_status status = AE_OK;
 	acpi_cpu_flags flags;
@@ -315,13 +344,24 @@ acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
 		goto unlock_and_exit;
 	}
 
-	status = acpi_ev_disable_gpe(gpe_event_info);
+	if ((type & ACPI_GPE_TYPE_WAKE) && gpe_event_info->runtime_count) {
+		if (--gpe_event_info->runtime_count == 0)
+			acpi_ev_disable_gpe(gpe_event_info);
+	}
+
+	if ((type & ACPI_GPE_TYPE_RUNTIME) && gpe_event_info->wakeup_count) {
+		/*
+		 * Wake-up GPEs are not enabled after leaving system sleep
+		 * states, so we don't need to disable them here.
+		 */
+		if (--gpe_event_info->wakeup_count == 0)
+			acpi_ev_update_gpe_enable_masks(gpe_event_info);
+	}
 
 unlock_and_exit:
 	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 	return_ACPI_STATUS(status);
 }
-
 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
 
 /*******************************************************************************
diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 8a95e83..09ca3ce 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -422,11 +422,9 @@ static int acpi_button_add(struct acpi_device *device)
 
 	if (device->wakeup.flags.valid) {
 		/* Button's GPE is run-wake GPE */
-		acpi_set_gpe_type(device->wakeup.gpe_device,
-				  device->wakeup.gpe_number,
-				  ACPI_GPE_TYPE_WAKE_RUN);
 		acpi_enable_gpe(device->wakeup.gpe_device,
-				device->wakeup.gpe_number);
+				device->wakeup.gpe_number,
+				ACPI_GPE_TYPE_WAKE_RUN);
 		device->wakeup.state.enabled = 1;
 	}
 
@@ -446,6 +444,13 @@ static int acpi_button_remove(struct acpi_device *device, int type)
 {
 	struct acpi_button *button = acpi_driver_data(device);
 
+	if (device->wakeup.flags.valid) {
+		acpi_disable_gpe(device->wakeup.gpe_device,
+				device->wakeup.gpe_number,
+				ACPI_GPE_TYPE_WAKE_RUN);
+		device->wakeup.state.enabled = 0;
+	}
+
 	acpi_button_remove_fs(device);
 	input_unregister_device(button->input);
 	kfree(button);
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index d6471bb..0fa65a8 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -307,7 +307,7 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
 	pr_debug(PREFIX "transaction start\n");
 	/* disable GPE during transaction if storm is detected */
 	if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
-		acpi_disable_gpe(NULL, ec->gpe);
+		acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
 	}
 
 	status = acpi_ec_transaction_unlocked(ec, t);
@@ -317,7 +317,7 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
 	if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
 		msleep(1);
 		/* it is safe to enable GPE outside of transaction */
-		acpi_enable_gpe(NULL, ec->gpe);
+		acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);
 	} else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) {
 		pr_info(PREFIX "GPE storm detected, "
 			"transactions will use polling mode\n");
@@ -788,8 +788,8 @@ static int ec_install_handlers(struct acpi_ec *ec)
 				  &acpi_ec_gpe_handler, ec);
 	if (ACPI_FAILURE(status))
 		return -ENODEV;
-	acpi_set_gpe_type(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
-	acpi_enable_gpe(NULL, ec->gpe);
+
+	acpi_enable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
 	status = acpi_install_address_space_handler(ec->handle,
 						    ACPI_ADR_SPACE_EC,
 						    &acpi_ec_space_handler,
@@ -806,6 +806,7 @@ static int ec_install_handlers(struct acpi_ec *ec)
 		} else {
 			acpi_remove_gpe_handler(NULL, ec->gpe,
 				&acpi_ec_gpe_handler);
+			acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
 			return -ENODEV;
 		}
 	}
@@ -816,6 +817,7 @@ static int ec_install_handlers(struct acpi_ec *ec)
 
 static void ec_remove_handlers(struct acpi_ec *ec)
 {
+	acpi_disable_gpe(NULL, ec->gpe, ACPI_GPE_TYPE_RUNTIME);
 	if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle,
 				ACPI_ADR_SPACE_EC, &acpi_ec_space_handler)))
 		pr_err(PREFIX "failed to remove space handler\n");
@@ -1058,7 +1060,7 @@ static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
 {
 	struct acpi_ec *ec = acpi_driver_data(device);
 	/* Stop using GPE */
-	acpi_disable_gpe(NULL, ec->gpe);
+	acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
 	return 0;
 }
 
@@ -1066,7 +1068,7 @@ static int acpi_ec_resume(struct acpi_device *device)
 {
 	struct acpi_ec *ec = acpi_driver_data(device);
 	/* Enable use of GPE back */
-	acpi_enable_gpe(NULL, ec->gpe);
+	acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);
 	return 0;
 }
 
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 79d33d9..3bde594 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -745,9 +745,18 @@ int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 		return -ENODEV;
 	}
 
-	error = enable ?
-		acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
-		acpi_disable_wakeup_device_power(adev);
+	if (enable) {
+		error = acpi_enable_wakeup_device_power(adev,
+						acpi_target_sleep_state);
+		if (!error)
+			acpi_enable_gpe(adev->wakeup.gpe_device,
+					adev->wakeup.gpe_number,
+					ACPI_GPE_TYPE_WAKE);
+	} else {
+		acpi_disable_gpe(adev->wakeup.gpe_device, adev->wakeup.gpe_number,
+				ACPI_GPE_TYPE_WAKE);
+		error = acpi_disable_wakeup_device_power(adev);
+	}
 	if (!error)
 		dev_info(dev, "wake-up capability %s by ACPI\n",
 				enable ? "enabled" : "disabled");
diff --git a/drivers/acpi/system.c b/drivers/acpi/system.c
index d112829..a206a12 100644
--- a/drivers/acpi/system.c
+++ b/drivers/acpi/system.c
@@ -387,10 +387,10 @@ static ssize_t counter_set(struct kobject *kobj,
 	if (index < num_gpes) {
 		if (!strcmp(buf, "disable\n") &&
 				(status & ACPI_EVENT_FLAG_ENABLED))
-			result = acpi_disable_gpe(handle, index);
+			result = acpi_set_gpe(handle, index, ACPI_GPE_DISABLE);
 		else if (!strcmp(buf, "enable\n") &&
 				!(status & ACPI_EVENT_FLAG_ENABLED))
-			result = acpi_enable_gpe(handle, index);
+			result = acpi_set_gpe(handle, index, ACPI_GPE_ENABLE);
 		else if (!strcmp(buf, "clear\n") &&
 				(status & ACPI_EVENT_FLAG_SET))
 			result = acpi_clear_gpe(handle, index, ACPI_NOT_ISR);
diff --git a/drivers/acpi/wakeup.c b/drivers/acpi/wakeup.c
index e0ee0c0..6783986 100644
--- a/drivers/acpi/wakeup.c
+++ b/drivers/acpi/wakeup.c
@@ -21,12 +21,12 @@
 ACPI_MODULE_NAME("wakeup_devices")
 
 /**
- * acpi_enable_wakeup_device_prep - prepare wakeup devices
- *	@sleep_state:	ACPI state
- * Enable all wakup devices power if the devices' wakeup level
- * is higher than requested sleep level
+ * acpi_enable_wakeup_device_prep - Prepare wake-up devices.
+ * @sleep_state: ACPI system sleep state.
+ *
+ * Enable all wake-up devices' power, unless the requested system sleep state is
+ * too deep.
  */
-
 void acpi_enable_wakeup_device_prep(u8 sleep_state)
 {
 	struct list_head *node, *next;
@@ -36,9 +36,8 @@ void acpi_enable_wakeup_device_prep(u8 sleep_state)
 						       struct acpi_device,
 						       wakeup_list);
 
-		if (!dev->wakeup.flags.valid ||
-		    !dev->wakeup.state.enabled ||
-		    (sleep_state > (u32) dev->wakeup.sleep_state))
+		if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
+		    || (sleep_state > (u32) dev->wakeup.sleep_state))
 			continue;
 
 		acpi_enable_wakeup_device_power(dev, sleep_state);
@@ -46,9 +45,12 @@ void acpi_enable_wakeup_device_prep(u8 sleep_state)
 }
 
 /**
- * acpi_enable_wakeup_device - enable wakeup devices
- *	@sleep_state:	ACPI state
- * Enable all wakup devices's GPE
+ * acpi_enable_wakeup_device - Enable wake-up device GPEs.
+ * @sleep_state: ACPI system sleep state.
+ *
+ * Enable all wake-up devices' GPEs, with the assumption that
+ * acpi_disable_all_gpes() was executed before, so we don't need to disable any
+ * GPEs here.
  */
 void acpi_enable_wakeup_device(u8 sleep_state)
 {
@@ -65,29 +67,22 @@ void acpi_enable_wakeup_device(u8 sleep_state)
 		if (!dev->wakeup.flags.valid)
 			continue;
 
-		/* If users want to disable run-wake GPE,
-		 * we only disable it for wake and leave it for runtime
-		 */
 		if ((!dev->wakeup.state.enabled && !dev->wakeup.prepare_count)
-		    || sleep_state > (u32) dev->wakeup.sleep_state) {
-			if (dev->wakeup.flags.run_wake) {
-				/* set_gpe_type will disable GPE, leave it like that */
-				acpi_set_gpe_type(dev->wakeup.gpe_device,
-						  dev->wakeup.gpe_number,
-						  ACPI_GPE_TYPE_RUNTIME);
-			}
+		    || sleep_state > (u32) dev->wakeup.sleep_state)
 			continue;
-		}
-		if (!dev->wakeup.flags.run_wake)
-			acpi_enable_gpe(dev->wakeup.gpe_device,
-					dev->wakeup.gpe_number);
+
+		/* The wake-up power should have been enabled already. */
+		acpi_set_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
+				ACPI_GPE_ENABLE);
 	}
 }
 
 /**
- * acpi_disable_wakeup_device - disable devices' wakeup capability
- *	@sleep_state:	ACPI state
- * Disable all wakup devices's GPE and wakeup capability
+ * acpi_disable_wakeup_device - Disable devices' wakeup capability.
+ * @sleep_state: ACPI system sleep state.
+ *
+ * This function only affects devices with wakeup.state.enabled set, which means
+ * that it reverses the changes made by acpi_enable_wakeup_device_prep().
  */
 void acpi_disable_wakeup_device(u8 sleep_state)
 {
@@ -97,30 +92,11 @@ void acpi_disable_wakeup_device(u8 sleep_state)
 		struct acpi_device *dev =
 			container_of(node, struct acpi_device, wakeup_list);
 
-		if (!dev->wakeup.flags.valid)
-			continue;
-
-		if ((!dev->wakeup.state.enabled && !dev->wakeup.prepare_count)
-		    || sleep_state > (u32) dev->wakeup.sleep_state) {
-			if (dev->wakeup.flags.run_wake) {
-				acpi_set_gpe_type(dev->wakeup.gpe_device,
-						  dev->wakeup.gpe_number,
-						  ACPI_GPE_TYPE_WAKE_RUN);
-				/* Re-enable it, since set_gpe_type will disable it */
-				acpi_enable_gpe(dev->wakeup.gpe_device,
-						dev->wakeup.gpe_number);
-			}
+		if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
+		    || (sleep_state > (u32) dev->wakeup.sleep_state))
 			continue;
-		}
 
 		acpi_disable_wakeup_device_power(dev);
-		/* Never disable run-wake GPE */
-		if (!dev->wakeup.flags.run_wake) {
-			acpi_disable_gpe(dev->wakeup.gpe_device,
-					 dev->wakeup.gpe_number);
-			acpi_clear_gpe(dev->wakeup.gpe_device,
-				       dev->wakeup.gpe_number, ACPI_NOT_ISR);
-		}
 	}
 }
 
@@ -136,11 +112,8 @@ int __init acpi_wakeup_device_init(void)
 		/* In case user doesn't load button driver */
 		if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled)
 			continue;
-		acpi_set_gpe_type(dev->wakeup.gpe_device,
-				  dev->wakeup.gpe_number,
-				  ACPI_GPE_TYPE_WAKE_RUN);
-		acpi_enable_gpe(dev->wakeup.gpe_device,
-				dev->wakeup.gpe_number);
+ 		acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
+ 				ACPI_GPE_TYPE_WAKE);
 		dev->wakeup.state.enabled = 1;
 	}
 	mutex_unlock(&acpi_device_lock);