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 f15fee76a4e2..f00f5c744f48 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);