HelenOS sources

qh_append_qh       85 uspace/drv/bus/usb/ehci/endpoint_list.c 	qh_append_qh(instance->list_head, next->list_head);
qh_append_qh      124 uspace/drv/bus/usb/ehci/endpoint_list.c 	qh_append_qh(last_qh, ep->qh);
HelenOS homepage, sources at GitHub