diff --git a/package/kernel/mac80211/patches/347-ath9k-don-t-run-periodic-and-nf-calibation-at-the-sa.patch b/package/kernel/mac80211/patches/347-ath9k-don-t-run-periodic-and-nf-calibation-at-the-sa.patch
new file mode 100644
index 0000000000..529e1098b3
--- /dev/null
+++ b/package/kernel/mac80211/patches/347-ath9k-don-t-run-periodic-and-nf-calibation-at-the-sa.patch
@@ -0,0 +1,26 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Tue, 27 Dec 2016 23:16:23 +0100
+Subject: [PATCH] ath9k: don't run periodic and nf calibation at the same time
+
+The checks already prevents periodic cal from being started while noise
+floor calibration runs. It is missing checks for the other way around.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/net/wireless/ath/ath9k/ar9002_calib.c
++++ b/drivers/net/wireless/ath/ath9k/ar9002_calib.c
+@@ -676,10 +676,10 @@ static int ar9002_hw_calibrate(struct at
+ 			return 0;
+ 
+ 		ah->cal_list_curr = currCal = currCal->calNext;
+-		if (currCal->calState == CAL_WAITING) {
++		if (currCal->calState == CAL_WAITING)
+ 			ath9k_hw_reset_calibration(ah, currCal);
+-			return 0;
+-		}
++
++		return 0;
+ 	}
+ 
+ 	/* Do NF cal only at longer intervals */