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authorRafael J. Wysocki <rjw@sisk.pl>2010-09-16 00:30:43 +0200
committerLen Brown <len.brown@intel.com>2010-09-24 16:55:47 -0400
commita210080195c95ebca2a517ee3057d71607aa65e0 (patch)
tree96aa2aee4b9bdbc747b7a0d7150d0b41650ebe90 /drivers/acpi/scan.c
parent2422084a94fcd5038406261b331672a13c92c050 (diff)
downloadlinux-linaro-android-a210080195c95ebca2a517ee3057d71607aa65e0.tar.gz
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>
Diffstat (limited to 'drivers/acpi/scan.c')
-rw-r--r--drivers/acpi/scan.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index b23825ecfa3..f87f04603b6 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1431,6 +1431,7 @@ EXPORT_SYMBOL(acpi_bus_add);
int acpi_bus_start(struct acpi_device *device)
{
struct acpi_bus_ops ops;
+ int result;
if (!device)
return -EINVAL;
@@ -1438,7 +1439,11 @@ int acpi_bus_start(struct acpi_device *device)
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 @@ int __init acpi_scan_init(void)
if (result)
acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
+ else
+ acpi_update_gpes();
return result;
}