mac80211: update minstrel_ht sample rate when probe is set

Waiting until the status is received can cause the same rate to be
probed multiple times consecutively.

Cc: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Daniel Halperin <dhalperi@cs.washington.edu>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/rc80211_minstrel_ht.c

@@ -415,10 +415,8 @@ minstrel_ht_tx_status(void *priv, struct ieee80211_supported_band *sband,
 		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) ||
@@ -551,13 +549,14 @@ minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
 	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,
@@ -566,17 +565,13 @@ minstrel_get_sample_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
 	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