ACPI / ACPICA: Fix reference counting problems with GPE handlers

[net-next-2.6.git] / drivers / acpi / acpica / evgpe.c

diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c
index 7a6a3e6f4be09dbc7522d17c10d3b03be579227d..f226eac314db587668a32e8cc75cd6bfd931b5f4 100644 (file)
--- a/drivers/acpi/acpica/evgpe.c
+++ b/drivers/acpi/acpica/evgpe.c
@@ -135,6 +135,79 @@ acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
 }
 
 
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_raw_enable_gpe
+ *
+ * PARAMETERS:  gpe_event_info  - GPE to enable
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
+ *              hardware-enabled.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_raw_enable_gpe(struct acpi_gpe_event_info *gpe_event_info)
+{
+       acpi_status status = AE_OK;
+
+       if (gpe_event_info->runtime_count == ACPI_UINT8_MAX) {
+               return_ACPI_STATUS(AE_LIMIT);
+       }
+
+       gpe_event_info->runtime_count++;
+       if (gpe_event_info->runtime_count == 1) {
+               status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
+               if (ACPI_SUCCESS(status)) {
+                       status = acpi_ev_enable_gpe(gpe_event_info);
+               }
+
+               if (ACPI_FAILURE(status)) {
+                       gpe_event_info->runtime_count--;
+               }
+       }
+
+       return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_raw_disable_gpe
+ *
+ * PARAMETERS:  gpe_event_info  - GPE to disable
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Remove a reference to a GPE. When the last reference is
+ *              removed, the GPE is hardware-disabled.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_raw_disable_gpe(struct acpi_gpe_event_info *gpe_event_info)
+{
+       acpi_status status = AE_OK;
+
+       if (!gpe_event_info->runtime_count) {
+               return_ACPI_STATUS(AE_LIMIT);
+       }
+
+       gpe_event_info->runtime_count--;
+       if (!gpe_event_info->runtime_count) {
+               status = acpi_ev_update_gpe_enable_mask(gpe_event_info);
+               if (ACPI_SUCCESS(status)) {
+                       status = acpi_hw_low_set_gpe(gpe_event_info,
+                                                    ACPI_GPE_DISABLE);
+               }
+
+               if (ACPI_FAILURE(status)) {
+                       gpe_event_info->runtime_count++;
+               }
+       }
+
+       return_ACPI_STATUS(status);
+}
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_low_get_gpe_info