int main() {
        spin_lock(&isp116x->lock);
        /* take idle endpoints out of the schedule */
        if (!list_empty(&ep->hep->urb_list)) {
          spin_unlock(&isp116x->lock);
          return;
	}

        /* async deschedule */
         if (!list_empty(&ep->schedule)) {
                 spin_unlock(&isp116x->lock);
                 return;
         }
}