mac80211/ath9k: fix duration calculation for short-guard-interval frames (thanks to Duy Nguyen for pointing this out)
SVN-Revision: 20114
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2 changed files with 15 additions and 1 deletions
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@ -100,7 +100,7 @@
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+/* Transmission time for a packet containing (syms) symbols */
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+#define MCS_SYMBOL_TIME(sgi, syms) \
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+ (sgi ? \
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+ ((syms) * 18 + 4) / 5 : /* syms * 3.6 us */ \
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+ ((syms) * 18 + 4) / 6 : /* syms * 3.6 us */ \
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+ (syms) << 2 /* syms * 4 us */ \
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+ )
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+
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@ -0,0 +1,14 @@
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--- a/drivers/net/wireless/ath/ath9k/xmit.c
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+++ b/drivers/net/wireless/ath/ath9k/xmit.c
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@@ -27,9 +27,9 @@
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#define HT_STF 4
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#define HT_LTF(_ns) (4 * (_ns))
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#define SYMBOL_TIME(_ns) ((_ns) << 2) /* ns * 4 us */
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-#define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 5) /* ns * 3.6 us */
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+#define SYMBOL_TIME_HALFGI(_ns) (((_ns) * 18 + 4) / 6) /* ns * 3.6 us */
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#define NUM_SYMBOLS_PER_USEC(_usec) (_usec >> 2)
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-#define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*5)-4)/18)
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+#define NUM_SYMBOLS_PER_USEC_HALFGI(_usec) (((_usec*6)-4)/18)
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#define OFDM_SIFS_TIME 16
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