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>

1 files changed, 5 insertions, 19 deletions

diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index df96a0fe4890..37d73024b82e 100644
--- 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);
 }