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rc80211_minstrel: fix contention window calculation 

The contention window is supposed to be a power of two minus one, i.e.
15, 31, 63, 127...  minstrel_rate_init() forgets to subtract 1, so the
sequence becomes 15, 32, 66, 134...

Bug reported by Dan Halperin <dhalperi@cs.washington.edu>

Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Pavel Roskin 2009-09-15 22:24:30 -04:00 committed by John W. Linville
parent de32cce132
commit 8c6c03fe23
1 changed files with 1 additions and 1 deletions
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2
net/mac80211/rc80211_minstrel.c
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@ -418,7 +418,7 @@ minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband,
/* contention window */
tx_time_single += t_slot + min(cw, mp->cw_max);
cw = (cw + 1) << 1;
cw = (cw << 1) | 1;
tx_time += tx_time_single;
tx_time_cts += tx_time_single + mi->sp_ack_dur;