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path: root/drivers/acpi/acpica/evxfgpe.c
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Diffstat (limited to 'drivers/acpi/acpica/evxfgpe.c')
-rw-r--r--drivers/acpi/acpica/evxfgpe.c106
1 files changed, 69 insertions, 37 deletions
diff --git a/drivers/acpi/acpica/evxfgpe.c b/drivers/acpi/acpica/evxfgpe.c
index 86f9b343ebd4..2ce44099eb84 100644
--- a/drivers/acpi/acpica/evxfgpe.c
+++ b/drivers/acpi/acpica/evxfgpe.c
@@ -197,12 +197,12 @@ acpi_status
acpi_setup_gpe_for_wake(acpi_handle wake_device,
acpi_handle gpe_device, u32 gpe_number)
{
- acpi_status status = AE_BAD_PARAMETER;
+ acpi_status status;
struct acpi_gpe_event_info *gpe_event_info;
struct acpi_namespace_node *device_node;
- struct acpi_gpe_notify_object *notify_object;
+ struct acpi_gpe_notify_info *notify;
+ struct acpi_gpe_notify_info *new_notify;
acpi_cpu_flags flags;
- u8 gpe_dispatch_mask;
ACPI_FUNCTION_TRACE(acpi_setup_gpe_for_wake);
@@ -216,63 +216,95 @@ acpi_setup_gpe_for_wake(acpi_handle wake_device,
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
+ /* Handle root object case */
+
+ if (wake_device == ACPI_ROOT_OBJECT) {
+ device_node = acpi_gbl_root_node;
+ } else {
+ device_node = ACPI_CAST_PTR(struct acpi_namespace_node, wake_device);
+ }
+
+ /* Validate WakeDevice is of type Device */
+
+ if (device_node->type != ACPI_TYPE_DEVICE) {
+ return_ACPI_STATUS (AE_BAD_PARAMETER);
+ }
+
+ /*
+ * Allocate a new notify object up front, in case it is needed.
+ * Memory allocation while holding a spinlock is a big no-no
+ * on some hosts.
+ */
+ new_notify = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_notify_info));
+ if (!new_notify) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
/* Ensure that we have a valid GPE number */
gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
if (!gpe_event_info) {
+ status = AE_BAD_PARAMETER;
goto unlock_and_exit;
}
- if (wake_device == ACPI_ROOT_OBJECT) {
- goto out;
- }
-
/*
* If there is no method or handler for this GPE, then the
- * wake_device will be notified whenever this GPE fires (aka
- * "implicit notify") Note: The GPE is assumed to be
+ * wake_device will be notified whenever this GPE fires. This is
+ * known as an "implicit notify". Note: The GPE is assumed to be
* level-triggered (for windows compatibility).
*/
- gpe_dispatch_mask = gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK;
- if (gpe_dispatch_mask != ACPI_GPE_DISPATCH_NONE
- && gpe_dispatch_mask != ACPI_GPE_DISPATCH_NOTIFY) {
- goto out;
- }
-
- /* Validate wake_device is of type Device */
-
- device_node = ACPI_CAST_PTR(struct acpi_namespace_node, wake_device);
- if (device_node->type != ACPI_TYPE_DEVICE) {
- goto unlock_and_exit;
+ if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
+ ACPI_GPE_DISPATCH_NONE) {
+ /*
+ * This is the first device for implicit notify on this GPE.
+ * Just set the flags here, and enter the NOTIFY block below.
+ */
+ gpe_event_info->flags =
+ (ACPI_GPE_DISPATCH_NOTIFY | ACPI_GPE_LEVEL_TRIGGERED);
}
- if (gpe_dispatch_mask == ACPI_GPE_DISPATCH_NONE) {
- gpe_event_info->flags = (ACPI_GPE_DISPATCH_NOTIFY |
- ACPI_GPE_LEVEL_TRIGGERED);
- gpe_event_info->dispatch.device.node = device_node;
- gpe_event_info->dispatch.device.next = NULL;
- } else {
- /* There are multiple devices to notify implicitly. */
-
- notify_object = ACPI_ALLOCATE_ZEROED(sizeof(*notify_object));
- if (!notify_object) {
- status = AE_NO_MEMORY;
- goto unlock_and_exit;
+ /*
+ * If we already have an implicit notify on this GPE, add
+ * this device to the notify list.
+ */
+ if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
+ ACPI_GPE_DISPATCH_NOTIFY) {
+
+ /* Ensure that the device is not already in the list */
+
+ notify = gpe_event_info->dispatch.notify_list;
+ while (notify) {
+ if (notify->device_node == device_node) {
+ status = AE_ALREADY_EXISTS;
+ goto unlock_and_exit;
+ }
+ notify = notify->next;
}
- notify_object->node = device_node;
- notify_object->next = gpe_event_info->dispatch.device.next;
- gpe_event_info->dispatch.device.next = notify_object;
+ /* Add this device to the notify list for this GPE */
+
+ new_notify->device_node = device_node;
+ new_notify->next = gpe_event_info->dispatch.notify_list;
+ gpe_event_info->dispatch.notify_list = new_notify;
+ new_notify = NULL;
}
- out:
+ /* Mark the GPE as a possible wake event */
+
gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
status = AE_OK;
- unlock_and_exit:
+unlock_and_exit:
acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
+
+ /* Delete the notify object if it was not used above */
+
+ if (new_notify) {
+ ACPI_FREE(new_notify);
+ }
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_setup_gpe_for_wake)