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ath9k: apply coverage class on slottime too

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According to 802.11-2007 17.3.8.6 (slot time), the slot time should
be increased by 3 us * coverage class. The code only increased the
ack timeout, which is fixed by this patch.

We have noticed in our long shot scenario that we see less collisions
with this patch.

Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
[add standard reference and commit message]
Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Mathias Kretschmer 2013-04-22 22:34:41 +02:00 committed by John W. Linville
parent 27eee235de
commit f77f823440
1 changed files with 2 additions and 1 deletions
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3
drivers/net/wireless/ath/ath9k/hw.c
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@ -1100,7 +1100,8 @@ void ath9k_hw_init_global_settings(struct ath_hw *ah)
}
/* As defined by IEEE 802.11-2007 17.3.8.6 */
acktimeout = slottime + sifstime + 3 * ah->coverage_class + ack_offset;
slottime += 3 * ah->coverage_class;
acktimeout = slottime + sifstime + ack_offset;
ctstimeout = acktimeout;
/*