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diff --git a/package/kernel/mac80211/patches/351-ath9k-fix-regression-in-bssidmask-calculation.patch b/package/kernel/mac80211/patches/351-ath9k-fix-regression-in-bssidmask-calculation.patch
new file mode 100644
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+++ b/package/kernel/mac80211/patches/351-ath9k-fix-regression-in-bssidmask-calculation.patch
@@ -0,0 +1,70 @@
+From: Ben Greear <greearb@candelatech.com>
+Date: Tue, 4 Nov 2014 15:22:50 -0800
+Subject: [PATCH] ath9k: fix regression in bssidmask calculation
+
+The commit that went into 3.17:
+
+ ath9k: Summarize hw state per channel context
+
+ Group and set hw state (opmode, primary_sta, beacon conf) per
+ channel context instead of whole list of vifs. This would allow
+ each channel context to run in different mode (STA/AP).
+
+ Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+ Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
+ Signed-off-by: John W. Linville <linville@tuxdriver.com>
+
+broke multi-vif configuration due to not properly calculating
+the bssid mask.
+
+The test case that caught this was:
+
+ create wlan0 and sta0-4 (6 total), not sure how much that matters.
+ associate all 6 (works fine)
+ disconnect 5 of them, leaving sta0 up
+ Start trying to bring up the other 5 one at a time. It will
+ fail, with iw events looking like this (in these logs, several
+ sta are trying to come up, but symptom is the same with just one)
+
+The patch causing the regression made quite a few changes, but
+the part I think caused this particular problem was not
+recalculating the bssid mask when adding and removing interfaces.
+
+Re-adding those calls fixes my test case. Fix bad comment
+as well.
+
+Signed-off-by: Ben Greear <greearb@candelatech.com>
+---
+
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -994,9 +994,8 @@ void ath9k_calculate_iter_data(struct at
+ struct ath_vif *avp;
+
+ /*
+- * Pick the MAC address of the first interface as the new hardware
+- * MAC address. The hardware will use it together with the BSSID mask
+- * when matching addresses.
++ * The hardware will use primary station addr together with the
++ * BSSID mask when matching addresses.
+ */
+ memset(iter_data, 0, sizeof(*iter_data));
+ memset(&iter_data->mask, 0xff, ETH_ALEN);
+@@ -1225,6 +1224,8 @@ static int ath9k_add_interface(struct ie
+ list_add_tail(&avp->list, &avp->chanctx->vifs);
+ }
+
++ ath9k_calculate_summary_state(sc, avp->chanctx);
++
+ ath9k_assign_hw_queues(hw, vif);
+
+ an->sc = sc;
+@@ -1294,6 +1295,8 @@ static void ath9k_remove_interface(struc
+
+ ath_tx_node_cleanup(sc, &avp->mcast_node);
+
++ ath9k_calculate_summary_state(sc, avp->chanctx);
++
+ mutex_unlock(&sc->mutex);
+ }
+