mac80211: fix a few more minstrel_ht bugs (thx to Christian Lamparter)

SVN-Revision: 20040

package/mac80211/patches/560-minstrel_ht.patch

@@ -68,7 +68,7 @@
  
 --- /dev/null
 +++ b/net/mac80211/rc80211_minstrel_ht.c
-@@ -0,0 +1,807 @@
+@@ -0,0 +1,809 @@
 +/*
 + * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
 + *
@@ -479,13 +479,15 @@
 +	 * downgrade to a lower number of streams if necessary.
 +	 */
 +	rate = minstrel_get_ratestats(mi, mi->max_tp_rate);
-+	if (MINSTREL_FRAC(rate->success, rate->attempts) <
++	if (rate->attempts > 30 &&
-+	    MINSTREL_FRAC(20, 100) && rate->attempts > 30)
++	    MINSTREL_FRAC(rate->success, rate->attempts) <
++	    MINSTREL_FRAC(20, 100))
 +		minstrel_downgrade_rate(mi, &mi->max_tp_rate, true);
 +
 +	rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate2);
-+	if (MINSTREL_FRAC(rate->success, rate->attempts) <
++	if (rate->attempts > 30 &&
-+	    MINSTREL_FRAC(20, 100) && rate->attempts > 30)
++	    MINSTREL_FRAC(rate->success, rate->attempts) <
++	    MINSTREL_FRAC(20, 100))
 +		minstrel_downgrade_rate(mi, &mi->max_tp_rate2, false);
 +
 +	if (time_after(jiffies, mi->stats_update + (mp->update_interval / 2 * HZ) / 1000))
@@ -1062,7 +1064,7 @@
 +			struct minstrel_rate_stats *mr = &mi->groups[i].rates[j];
 +			int idx = i * MCS_GROUP_RATES + j;
 +
-+			if (!mi->groups[i].supported & BIT(j))
++			if (!(mi->groups[i].supported & BIT(j)))
 +				continue;
 +
 +			p += sprintf(p, "HT%c0/%cGI ", htmode, gimode);