MEDIA_ENT_F_UNKNOWN
entity->function == MEDIA_ENT_F_UNKNOWN)
if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN)
vdev->entity.function = MEDIA_ENT_F_UNKNOWN;
if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) {
if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN) {
#define MEDIA_ENT_T_UNKNOWN MEDIA_ENT_F_UNKNOWN