mac80211: minstrel_ht: fix rates selection

When initializing rates selections starting indexes upon stats update,
the minstrel_sta->max_* rates should be 'group * MCS_GROUP_RATES + i'
not 'i'. This affects settings where one of the peers does not support
any of the rates of the group 0 (i.e. when ht_cap.mcs.rx_mask[0] == 0).

Signed-off-by: Karl Beldan <karl.beldan@rivierawaves.com>
Acked-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index 5d60779a0c1b..47aa6f81566b 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -277,13 +277,15 @@ minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
                         if (!(mg->supported & BIT(i)))
                                 continue;
 
+                        index = MCS_GROUP_RATES * group + i;
+
                         /* initialize rates selections starting indexes */
                         if (!mg_rates_valid) {
                                 mg->max_tp_rate = mg->max_tp_rate2 =
                                         mg->max_prob_rate = i;
                                 if (!mi_rates_valid) {
                                         mi->max_tp_rate = mi->max_tp_rate2 =
-                                                mi->max_prob_rate = i;
+                                                mi->max_prob_rate = index;
                                         mi_rates_valid = true;
                                 }
                                 mg_rates_valid = true;
@@ -291,7 +293,6 @@ minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
 
                         mr = &mg->rates[i];
                         mr->retry_updated = false;
-                        index = MCS_GROUP_RATES * group + i;
                         minstrel_calc_rate_ewma(mr);
                         minstrel_ht_calc_tp(mi, group, i);