Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
index 76f303f..a1e9fc7 100644
--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright 2002-2005, Instant802 Networks, Inc.
  * Copyright 2005-2006, Devicescape Software, Inc.
  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  * Copyright 2017	Intel Deutschland GmbH
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
  */
 
 #include <linux/kernel.h>
@@ -357,8 +354,10 @@
 		break;
 	}
 	WARN_ONCE(i == sband->n_bitrates,
-		  "no supported rates (0x%x) in rate_mask 0x%x with flags 0x%x\n",
+		  "no supported rates for sta %pM (0x%x, band %d) in rate_mask 0x%x with flags 0x%x\n",
+		  sta ? sta->addr : NULL,
 		  sta ? sta->supp_rates[sband->band] : -1,
+		  sband->band,
 		  rate_mask, rate_flags);
 
 	info->control.rates[0].count =
@@ -369,9 +368,8 @@
 }
 
 
-bool rate_control_send_low(struct ieee80211_sta *pubsta,
-			   void *priv_sta,
-			   struct ieee80211_tx_rate_control *txrc)
+static bool rate_control_send_low(struct ieee80211_sta *pubsta,
+				  struct ieee80211_tx_rate_control *txrc)
 {
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
 	struct ieee80211_supported_band *sband = txrc->sband;
@@ -379,7 +377,7 @@
 	int mcast_rate;
 	bool use_basicrate = false;
 
-	if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) {
+	if (!pubsta || rc_no_data_or_no_ack_use_min(txrc)) {
 		__rate_control_send_low(txrc->hw, sband, pubsta, info,
 					txrc->rate_idx_mask);
 
@@ -405,7 +403,6 @@
 	}
 	return false;
 }
-EXPORT_SYMBOL(rate_control_send_low);
 
 static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask)
 {
@@ -888,26 +885,29 @@
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
 	int i;
 
-	if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
-		ista = &sta->sta;
-		priv_sta = sta->rate_ctrl_priv;
-	}
-
 	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 		info->control.rates[i].idx = -1;
 		info->control.rates[i].flags = 0;
 		info->control.rates[i].count = 0;
 	}
 
+	if (rate_control_send_low(sta ? &sta->sta : NULL, txrc))
+		return;
+
 	if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
 		return;
 
+	if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
+		ista = &sta->sta;
+		priv_sta = sta->rate_ctrl_priv;
+	}
+
 	if (ista) {
 		spin_lock_bh(&sta->rate_ctrl_lock);
 		ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
 		spin_unlock_bh(&sta->rate_ctrl_lock);
 	} else {
-		ref->ops->get_rate(ref->priv, NULL, NULL, txrc);
+		rate_control_send_low(NULL, txrc);
 	}
 
 	if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE))