use_ack          3436 dev/ic/atw.c   atw_compute_duration1(int len, int use_ack, uint32_t flags, int rate,
use_ack          3485 dev/ic/atw.c   	ack = (use_ack) ? pre + (IEEE80211_DUR_DS_SLOW_ACK * 2) / ctsrate : 0;
use_ack          2953 dev/ic/rtw.c   rtw_compute_duration1(int len, int use_ack, uint32_t flags, int rate,
use_ack          3002 dev/ic/rtw.c   	ack = (use_ack) ? pre + (IEEE80211_DUR_DS_SLOW_ACK * 2) / ctsrate : 0;