ACPI / PAD: use acpi_evaluate_ost() to replace open-coded version

Use public function acpi_evaluate_ost() to replace open-coded
version of evaluating ACPI _OST method.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index df96a0fe48905aa77d5ac17248195c0c1fcb9221..37d73024b82e4f9a7df2820e331bd873e0805947 100644 (file)
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -408,28 +408,14 @@ static int acpi_pad_pur(acpi_handle handle)
        return num;
 }
 
-/* Notify firmware how many CPUs are idle */
-static void acpi_pad_ost(acpi_handle handle, int stat,
-       uint32_t idle_cpus)
-{
-       union acpi_object params[3] = {
-               {.type = ACPI_TYPE_INTEGER,},
-               {.type = ACPI_TYPE_INTEGER,},
-               {.type = ACPI_TYPE_BUFFER,},
-       };
-       struct acpi_object_list arg_list = {3, params};
-
-       params[0].integer.value = ACPI_PROCESSOR_AGGREGATOR_NOTIFY;
-       params[1].integer.value =  stat;
-       params[2].buffer.length = 4;
-       params[2].buffer.pointer = (void *)&idle_cpus;
-       acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
-}
-
 static void acpi_pad_handle_notify(acpi_handle handle)
 {
        int num_cpus;
        uint32_t idle_cpus;
+       struct acpi_buffer param = {
+               .length = 4,
+               .pointer = (void *)&idle_cpus,
+       };
 
        mutex_lock(&isolated_cpus_lock);
        num_cpus = acpi_pad_pur(handle);
@@ -439,7 +425,7 @@ static void acpi_pad_handle_notify(acpi_handle handle)
        }
        acpi_pad_idle_cpus(num_cpus);
        idle_cpus = acpi_pad_idle_cpus_num();
-       acpi_pad_ost(handle, 0, idle_cpus);
+       acpi_evaluate_ost(handle, ACPI_PROCESSOR_AGGREGATOR_NOTIFY, 0, &param);
        mutex_unlock(&isolated_cpus_lock);
 }