diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index ce7cb1b..d98fac5 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2110,6 +2110,17 @@
 	return 0;
 }
 
+static inline
+bool rate_usable_index_exists(struct ieee80211_supported_band *sband,
+			      struct ieee80211_sta *sta)
+{
+	unsigned int i;
+
+	for (i = 0; i < sband->n_bitrates; i++)
+		if (rate_supported(sta, sband->band, i))
+			return true;
+	return false;
+}
 
 int ieee80211_rate_control_register(struct rate_control_ops *ops);
 void ieee80211_rate_control_unregister(struct rate_control_ops *ops);