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[PATCH] cfg80211: add warning when calculating MCS rates >= 32

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From: Johannes Berg <johannes.berg@xxxxxxxxx>

cfg80211_calculate_bitrate() doesn't work for MCS
rates 32 or higher, and it has always returned 0
in that case. Warn if it ever really happens.

Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
 net/wireless/util.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/wireless/util.c	2012-05-08 21:33:50.000000000 +0200
+++ b/net/wireless/util.c	2012-05-08 21:33:54.000000000 +0200
@@ -879,7 +879,7 @@ u16 cfg80211_calculate_bitrate(struct ra
 		return rate->legacy;
 
 	/* the formula below does only work for MCS values smaller than 32 */
-	if (rate->mcs >= 32)
+	if (WARN_ON_ONCE(rate->mcs >= 32))
 		return 0;
 
 	modulation = rate->mcs & 7;


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