ACPI / ACPICA: Defer enabling of runtime GPEs (v3)
The current ACPI GPEs initialization code has a problem that it
enables some GPEs pointed to by device _PRW methods, generally
intended for signaling wakeup events (system or device wakeup).
These GPEs are then almost immediately disabled by the ACPI namespace
scanning code with the help of acpi_gpe_can_wake(), but it would be
better not to enable them at all until really necessary.
Modify the initialization of GPEs so that the ones that have
associated _Lxx or _Exx methods and are not pointed to by any _PRW
methods will be enabled after the namespace scan is complete.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index b23825e..f87f046 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1431,6 +1431,7 @@
int acpi_bus_start(struct acpi_device *device)
{
struct acpi_bus_ops ops;
+ int result;
if (!device)
return -EINVAL;
@@ -1438,7 +1439,11 @@
memset(&ops, 0, sizeof(ops));
ops.acpi_op_start = 1;
- return acpi_bus_scan(device->handle, &ops, NULL);
+ result = acpi_bus_scan(device->handle, &ops, NULL);
+
+ acpi_update_gpes();
+
+ return result;
}
EXPORT_SYMBOL(acpi_bus_start);
@@ -1552,6 +1557,8 @@
if (result)
acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
+ else
+ acpi_update_gpes();
return result;
}