wmi: convert acpi_get_handle() to acpi_has_method()

acpi_has_method() is a new ACPI API introduced to check
the existence of an ACPI control method.

It can be used to replace acpi_get_handle() in the case that
1. the calling function doesn't need the ACPI handle of the control method.
and
2. the calling function doesn't care the reason why the method is unavailable.

Convert acpi_get_handle() to acpi_has_method()
in drivers/platform/x86/wmi.c in this patch.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
CC: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 3bb55060bd050e97d45119475be3ff29ed9e8891..62e8c221d01ea10a5f105a0a44b2d2d8277d7878 100644 (file)
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -347,7 +347,7 @@ struct acpi_buffer *out)
 {
        struct guid_block *block = NULL;
        struct wmi_block *wblock = NULL;
-       acpi_handle handle, wc_handle;
+       acpi_handle handle;
        acpi_status status, wc_status = AE_ERROR;
        struct acpi_object_list input;
        union acpi_object wq_params[1];
@@ -387,8 +387,7 @@ struct acpi_buffer *out)
                 * expensive, but have no corresponding WCxx method. So we
                 * should not fail if this happens.
                 */
-               wc_status = acpi_get_handle(handle, wc_method, &wc_handle);
-               if (ACPI_SUCCESS(wc_status))
+               if (acpi_has_method(handle, wc_method))
                        wc_status = acpi_execute_simple_method(handle,
                                                                wc_method, 1);
        }