if(!ivideo->accel) return 0;
if((!ivideo->accel) || (!ivideo->engineok)) return 0;
int fbcon_sis_sync(struct fb_info *info){   struct sis_video_info *ivideo = (struct sis_video_info *)info->par;   CRITFLAGS   if(!ivideo->accel)   	return 0;   if(ivideo->sisvga_engine == SIS_300_VGA) {#ifdef CONFIG_FB_SIS_300      SiS300Sync(ivideo);#endif   } else {#ifdef CONFIG_FB_SIS_315      SiS310Sync(ivideo);#endif   }   CRITEND   return 0;}