ACPI: dock: convert acpi_evaluate_object() to acpi_evaluate_integer()

acpi_evaluate_integer() is an ACPI API introduced to evaluate an
ACPI control method that is known to have an integer return value.
This API can simplify the code because the calling function does not need to
use the specified acpi_buffer structure required by acpi_evaluate_object();

Convert acpi_evaluate_object() to acpi_evaluate_integer()
in drivers/acpi/dock.c in this patch.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 05ea4be01a832ccb3d8b38e4318c66fee0f83a89..ca86c1ce7c8a1b5d06713e6a5264e25bd05e99e5 100644 (file)
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -441,7 +441,7 @@ static void handle_dock(struct dock_station *ds, int dock)
        acpi_status status;
        struct acpi_object_list arg_list;
        union acpi_object arg;
-       struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+       unsigned long long value;
 
        acpi_handle_info(ds->handle, "%s\n", dock ? "docking" : "undocking");
 
@@ -450,12 +450,10 @@ static void handle_dock(struct dock_station *ds, int dock)
        arg_list.pointer = &arg;
        arg.type = ACPI_TYPE_INTEGER;
        arg.integer.value = dock;
-       status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer);
+       status = acpi_evaluate_integer(ds->handle, "_DCK", &arg_list, &value);
        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
                acpi_handle_err(ds->handle, "Failed to execute _DCK (0x%x)\n",
                                status);
-
-       kfree(buffer.pointer);
 }
 
 static inline void dock(struct dock_station *ds)