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From:   Felix Fietkau <nbd@nbd.name>
To:     linux-wireless@vger.kernel.org
Cc:     johannes@sipsolutions.net
Subject: [PATCH 5.11] mac80211: fix station rate table updates on assoc
Date:   Mon,  1 Feb 2021 09:33:24 +0100
Message-Id: <20210201083324.3134-1-nbd@nbd.name>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

If the driver uses .sta_add, station entries are only uploaded after the sta
is in assoc state. Fix early station rate table updates by deferring them
until the sta has been uploaded

Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 net/mac80211/driver-ops.c | 5 ++++-
 net/mac80211/rate.c       | 3 ++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/mac80211/driver-ops.c b/net/mac80211/driver-ops.c
index c9a8a2433e8a..a1f879cd53fe 100644
--- a/net/mac80211/driver-ops.c
+++ b/net/mac80211/driver-ops.c
@@ -125,8 +125,11 @@ int drv_sta_state(struct ieee80211_local *local,
 	} else if (old_state == IEEE80211_STA_AUTH &&
 		   new_state == IEEE80211_STA_ASSOC) {
 		ret = drv_sta_add(local, sdata, &sta->sta);
-		if (ret == 0)
+		if (ret == 0) {
 			sta->uploaded = true;
+			if (rcu_dereference(sta->sta.rates))
+				drv_sta_rate_tbl_update(local, sdata, &sta->sta);
+		}
 	} else if (old_state == IEEE80211_STA_ASSOC &&
 		   new_state == IEEE80211_STA_AUTH) {
 		drv_sta_remove(local, sdata, &sta->sta);
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
index 45927202c71c..63652c39c8e0 100644
--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -960,7 +960,8 @@ int rate_control_set_rates(struct ieee80211_hw *hw,
 	if (old)
 		kfree_rcu(old, rcu_head);
 
-	drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta);
+	if (sta->uploaded)
+		drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta);
 
 	ieee80211_sta_set_expected_throughput(pubsta, sta_get_expected_throughput(sta));
 
-- 
2.28.0