ath9k_htc: Fix beacon distribution in IBSS mode

This patch ensures fair beacon distribution in IBSS mode
by configuring proper CWmin based on slot time.

Signed-off-by: Rajkumar Manoharan <rmanoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_beacon.c b/drivers/net/wireless/ath/ath9k/htc_drv_beacon.c
index bd1506e69105..1b72aa482ac7 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_beacon.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_beacon.c
@@ -235,7 +235,14 @@ void ath9k_htc_beaconq_config(struct ath9k_htc_priv *priv)
         ath9k_hw_get_txq_props(ah, qnum, &qi_be);
 
         qi.tqi_aifs = qi_be.tqi_aifs;
-        qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
+        /* For WIFI Beacon Distribution
+         * Long slot time  : 2x cwmin
+         * Short slot time : 4x cwmin
+         */
+        if (ah->slottime == ATH9K_SLOT_TIME_20)
+                qi.tqi_cwmin = 2*qi_be.tqi_cwmin;
+        else
+                qi.tqi_cwmin = 4*qi_be.tqi_cwmin;
         qi.tqi_cwmax = qi_be.tqi_cwmax;
 
         if (!ath9k_hw_set_txq_props(ah, priv->beaconq, &qi)) {