PCI/ACPI: Remove unnecessary _OSC evaluation for control request
If a control had already been granted, we don't need to re-evaluate
_OSC for it because firmware may not reject control of any feature it
has previously granted control to.
Reviewed-by: Andrew Patterson <andrew.patterson@hp.com>
Tested-by: Andrew Patterson <andrew.patterson@hp.com>
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index c580a52..736bb24 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -210,6 +210,10 @@
goto out;
}
+ /* No need to evaluate _OSC if the control was already granted. */
+ if ((osc_data->control_set & ctrlset) == ctrlset)
+ goto out;
+
if (!osc_data->is_queried) {
status = __acpi_query_osc(osc_data->support_set, osc_data);
if (ACPI_FAILURE(status))