mac80211: fix minstrel_ht sampling intervals (patch by Daniel Halperin)

SVN-Revision: 25964

diff --git a/package/mac80211/patches/560-mac80211_minstrel_ht_sampling_fix.patch b/package/mac80211/patches/560-mac80211_minstrel_ht_sampling_fix.patch
new file mode 100644 (file)
index 0000000..011f87a
--- /dev/null
+++ b/package/mac80211/patches/560-mac80211_minstrel_ht_sampling_fix.patch
@@ -0,0 +1,50 @@
+--- a/net/mac80211/rc80211_minstrel_ht.c
++++ b/net/mac80211/rc80211_minstrel_ht.c
+@@ -415,10 +415,8 @@ minstrel_ht_tx_status(void *priv, struct
+               mi->sample_count--;
+       }
+ 
+-      if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) {
++      if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
+               mi->sample_packets += info->status.ampdu_len;
+-              minstrel_next_sample_idx(mi);
+-      }
+ 
+       for (i = 0; !last; i++) {
+               last = (i == IEEE80211_TX_MAX_RATES - 1) ||
+@@ -553,13 +551,14 @@ minstrel_get_sample_rate(struct minstrel
+       sample_idx = sample_table[mg->column][mg->index];
+       mr = &mg->rates[sample_idx];
+       sample_idx += mi->sample_group * MCS_GROUP_RATES;
++      minstrel_next_sample_idx(mi);
+ 
+       /*
+        * When not using MRR, do not sample if the probability is already
+        * higher than 95% to avoid wasting airtime
+        */
+       if (!mp->has_mrr && (mr->probability > MINSTREL_FRAC(95, 100)))
+-              goto next;
++              return -1;
+ 
+       /*
+        * Make sure that lower rates get sampled only occasionally,
+@@ -568,17 +567,13 @@ minstrel_get_sample_rate(struct minstrel
+       if (minstrel_get_duration(sample_idx) >
+           minstrel_get_duration(mi->max_tp_rate)) {
+               if (mr->sample_skipped < 20)
+-                      goto next;
++                      return -1;
+ 
+               if (mi->sample_slow++ > 2)
+-                      goto next;
++                      return -1;
+       }
+ 
+       return sample_idx;
+-
+-next:
+-      minstrel_next_sample_idx(mi);
+-      return -1;
+ }
+ 
+ static void