Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 727b662c authored by Sylvain Roger Rieunier's avatar Sylvain Roger Rieunier Committed by John W. Linville
Browse files

ath9k: fix invalid max frame length 



According to 802.11n-2012 standard in paragraph PPDU Fromat(20.3.2) HT-mixed
format  Hearder PPDU contains : L_STF, L_LTF, L_SIG, HT_SIG, HT_STF, HT_LTF
they are symbols in the preamble, there are in time unit(us) that's for why
it can't be computed in bytes

Signed-off-by: default avatarSylvain ROGER RIEUNIER <sylvain.roger.rieunier@gmail.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent c8e49556

drivers/net/wireless/ath/ath9k/xmit.c

+1 −1
Original line number Diff line number Diff line
@@ -1040,11 +1040,11 @@ static int ath_max_framelen(int usec, int mcs, bool ht40, bool sgi) 
	int symbols, bits;

	int bytes = 0;



	usec -= L_STF + L_LTF + L_SIG + HT_SIG + HT_STF + HT_LTF(streams);

	symbols = sgi ? TIME_SYMBOLS_HALFGI(usec) : TIME_SYMBOLS(usec);

	bits = symbols * bits_per_symbol[mcs % 8][ht40] * streams;

	bits -= OFDM_PLCP_BITS;

	bytes = bits / 8;

	bytes -= L_STF + L_LTF + L_SIG + HT_SIG + HT_STF + HT_LTF(streams);

	if (bytes > 65532)

		bytes = 65532;