ACPI / video: skip evaluating _DOD when it does not exist

commit e34fbbac669de0b7fb7803929d0477f35f6e2833 upstream.

Some system supports hybrid graphics and its discrete VGA
does not have any connectors and therefore has no _DOD method.

Signed-off-by: Alex Hung <alex.hung@canonical.com>
Reviewed-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c
index 5fdac394207afabef12a380ef8a20eca4a9bad05..549cdbed7b0e423cae9ee5e69848f818cc8722df 100644 (file)
--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -1211,6 +1211,9 @@ static int acpi_video_device_enumerate(struct acpi_video_bus *video)
        union acpi_object *dod = NULL;
        union acpi_object *obj;
 
+       if (!video->cap._DOD)
+               return AE_NOT_EXIST;
+
        status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
        if (!ACPI_SUCCESS(status)) {
                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));