cfg80211: add warning when calculating MCS rates >= 32

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@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 6cba00173a2f8b2b559a97e1be48a61790a0c679..177df03064cf8b018c3ef0e243dca6a693b1cf4c 100644 (file)
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -880,7 +880,7 @@ u16 cfg80211_calculate_bitrate(struct rate_info *rate)
                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;