From: Pavel Roskin <proski@gnu.org>
To: Dan Halperin <dhalperi@cs.washington.edu>,
linux-wireless@vger.kernel.org,
"John W. Linville" <linville@tuxdriver.com>
Subject: [PATCH] rc80211_minstrel: fix contention window calculation
Date: Tue, 15 Sep 2009 22:24:30 -0400 [thread overview]
Message-ID: <20090916022430.27557.93510.stgit@mj.roinet.com> (raw)
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>
---
net/mac80211/rc80211_minstrel.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/net/mac80211/rc80211_minstrel.c b/net/mac80211/rc80211_minstrel.c
index 7c51429..6e5d68b 100644
--- a/net/mac80211/rc80211_minstrel.c
+++ b/net/mac80211/rc80211_minstrel.c
@@ -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;
reply other threads:[~2009-09-16 2:24 UTC|newest]
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