mac80211/minstrel_ht: fix cck rate sampling

The CCK group needs special treatment to set the right flags and rate
index. Add this missing check to prevent setting broken rates for tx
packets.

Cc: stable@vger.kernel.org # 3.10
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>

diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index 5b2d3012b9830aef8d9101c26ba761402993b382..f5aed963b22e62cd997872d1068bfb6c45eeda7a 100644 (file)
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -804,10 +804,18 @@ minstrel_ht_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
 
        sample_group = &minstrel_mcs_groups[sample_idx / MCS_GROUP_RATES];
        info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
+       rate->count = 1;
+
+       if (sample_idx / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) {
+               int idx = sample_idx % ARRAY_SIZE(mp->cck_rates);
+               rate->idx = mp->cck_rates[idx];
+               rate->flags = 0;
+               return;
+       }
+
        rate->idx = sample_idx % MCS_GROUP_RATES +
                    (sample_group->streams - 1) * MCS_GROUP_RATES;
        rate->flags = IEEE80211_TX_RC_MCS | sample_group->flags;
-       rate->count = 1;
 }
 
 static void