HT_LTF           1087 drivers/net/wireless/ath/ath9k/xmit.c 	duration += L_STF + L_LTF + L_SIG + HT_SIG + HT_STF + HT_LTF(streams);
HT_LTF           1098 drivers/net/wireless/ath/ath9k/xmit.c 	usec -= L_STF + L_LTF + L_SIG + HT_SIG + HT_STF + HT_LTF(streams);