Hi all,
I am using ath9k/mac80211 on a PC Engines Alix with a Mikrotik R52n
card (AR9280 chipset), OpenWrt r21030 (kernel 2.6.32.10) and
compat-wireless-2010-04-21. I am injecting packets using a VAP in
monitor mode.
I have a doubt on ath9k_hw_init_defaults() in hw.c. In particular
during the bootstrap ah->slottime in ath9k_hw_init_defaults() is set
to " (u32) -1", so after a HW reset (for example as a result of a
channel change) in the function ath9k_hw_init_global_settings() the
acktimeout variable wraps around as ah->slottime is 0xFFFFFFFF and
acktimeout = sifstime + ah->slottime + 3 * ah->coverage_class
In this way we obtain that acktimout is set to 15 us (assuming
ah->coverage_class set to 0) in the 5GHZ band so less than one of its
summands (sifstime = 16).
I wrote this simple patch in order to set ah->slottime to standard
value for OFDM PHY layer during bootstrap.
Signed-off-by: Lorenzo Bianconi <lorenzo.biancon...@gmail.com>
---
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -425,7 +425,7 @@
ah->sta_id1_defaults = AR_STA_ID1_CRPT_MIC_ENABLE;
ah->beacon_interval = 100;
ah->enable_32kHz_clock = DONT_USE_32KHZ;
- ah->slottime = (u32) -1;
+ ah->slottime = 20;
ah->globaltxtimeout = (u32) -1;
ah->power_mode = ATH9K_PM_UNDEFINED;
}
--
Regards
Lorenzo
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