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.
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@xxxxxxxxxxxxxx>
Signed-off-by: Taku Izumi <izumi.taku@xxxxxxxxxxxxxx>
drivers/pci/pci-acpi.c | 4 ++++
1 file changed, 4 insertions(+)
Index: linux-next.28rc4/drivers/pci/pci-acpi.c
===================================================================
--- linux-next.28rc4.orig/drivers/pci/pci-acpi.c
+++ linux-next.28rc4/drivers/pci/pci-acpi.c
@@ -209,6 +209,10 @@ acpi_status pci_osc_control_set(acpi_han
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))
--
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