diff options
| author | Felix Fietkau <nbd@openwrt.org> | 2010-02-11 18:07:19 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-02-12 14:28:40 -0500 |
| commit | 42c4568a4ace0adc27a9d6f02936e2047ba6fc7e (patch) | |
| tree | be0b60ad408401fd2449d87ca1d380731f0dcbf0 | |
| parent | 4cad6c7c38930618d77e65af82c1403d63879eee (diff) | |
ath9k: add a workaround for ack timeout issuesmaster-2010-02-12
Adding support for setting the coverage class in some cases broke
association and data transfer, as it overwrote the initial ACK timeout
value from the initvals with a smaller value.
I don't know why the new value works in 5 GHz (matches the initval
there), but not in 2.4 GHz (initvals use 64us here), so until the
problem is fully understood, the value should be increased again.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/hw.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c index f15fee76a4e..f00f5c744f4 100644 --- a/drivers/net/wireless/ath/ath9k/hw.c +++ b/drivers/net/wireless/ath/ath9k/hw.c @@ -1217,6 +1217,17 @@ void ath9k_hw_init_global_settings(struct ath_hw *ah) /* As defined by IEEE 802.11-2007 17.3.8.6 */ slottime = ah->slottime + 3 * ah->coverage_class; acktimeout = slottime + sifstime; + + /* + * Workaround for early ACK timeouts, add an offset to match the + * initval's 64us ack timeout value. + * This was initially only meant to work around an issue with delayed + * BA frames in some implementations, but it has been found to fix ACK + * timeout issues in other cases as well. + */ + if (conf->channel && conf->channel->band == IEEE80211_BAND_2GHZ) + acktimeout += 64 - sifstime - ah->slottime; + ath9k_hw_setslottime(ah, slottime); ath9k_hw_set_ack_timeout(ah, acktimeout); ath9k_hw_set_cts_timeout(ah, acktimeout); |