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--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -27,9 +27,9 @@
#define HT_STF 4
#define HT_LTF(_ns) (4 * (_ns))
#define SYMBOL_TIME(_ns) ((_ns) << 2) /* ns * 4 us */
-#define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 5) /* ns * 3.6 us */
+#define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 6) /* ns * 3.6 us */
#define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2)
-#define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18)
+#define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*6)-4)/18)
#define OFDM_SIFS_TIME 16
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