ACPI: processor: only evaluate _PDC once per processor

If we evaluate _PDC in the early path, we do not want to evaluate
it again when the processor driver is loaded.

Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/processor_pdc.c b/drivers/acpi/processor_pdc.c
index 3bbafe9..e306ba9 100644 (file)
--- a/drivers/acpi/processor_pdc.c
+++ b/drivers/acpi/processor_pdc.c
@@ -125,6 +125,8 @@ acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
        return status;
 }
 
+static int early_pdc_done;
+
 void acpi_processor_set_pdc(acpi_handle handle)
 {
        struct acpi_object_list *obj_list;
@@ -132,6 +134,9 @@ void acpi_processor_set_pdc(acpi_handle handle)
        if (arch_has_acpi_pdc() == false)
                return;
 
+       if (early_pdc_done)
+               return;
+
        obj_list = acpi_processor_alloc_pdc();
        if (!obj_list)
                return;
@@ -199,4 +204,6 @@ void __init acpi_early_processor_set_pdc(void)
        acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
                            ACPI_UINT32_MAX,
                            early_init_pdc, NULL, NULL, NULL);
+
+       early_pdc_done = 1;
 }