ath9k: add a workaround for the tx ack time issue triggered by the timing handling cleanups in 2.4 ghz, calculating the ack timeout the way it is described in 802.11-2007 currently leads to tx timeouts set it to a minimum of what the initvals set (64 usec) until we know what is causing this
SVN-Revision: 19156
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--- a/drivers/net/wireless/ath/ath9k/hw.c
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+++ b/drivers/net/wireless/ath/ath9k/hw.c
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@@ -1229,6 +1229,11 @@ void ath9k_hw_init_global_settings(struc
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/* As defined by IEEE 802.11-2007 17.3.8.6 */
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slottime = ah->slottime + 3 * ah->coverage_class;
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acktimeout = slottime + sifstime;
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+
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+ /* Workaround for a hw issue */
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+ if (conf->channel && conf->channel->band == IEEE80211_BAND_2GHZ)
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+ acktimeout = max(64, acktimeout);
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+
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ath9k_hw_setslottime(ah, slottime);
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ath9k_hw_set_ack_timeout(ah, acktimeout);
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ath9k_hw_set_cts_timeout(ah, acktimeout);
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