netdev - [PATCH AUTOSEL 5.8 03/29] mt76: mt7915: use ieee80211_free

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Date:   Mon, 28 Sep 2020 21:30:00 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Felix Fietkau <nbd@....name>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.8 03/29] mt76: mt7915: use ieee80211_free_txskb to free tx skbs

From: Felix Fietkau <nbd@....name>

[ Upstream commit b4be5a53ebf478ffcfb4c98c0ccc4a8d922b9a02 ]

Using dev_kfree_skb for tx skbs breaks AQL. This worked until now only
by accident, because a mac80211 issue breaks AQL on drivers with firmware
rate control that report the rate via ieee80211_tx_status_ext as struct
rate_info.

Signed-off-by: Felix Fietkau <nbd@....name>
Acked-by: Toke Høiland-Jørgensen <toke@...hat.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Link: https://lore.kernel.org/r/20200812144943.91974-1-nbd@nbd.name
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7915/init.c | 8 ++++++--
 drivers/net/wireless/mediatek/mt76/mt7915/mac.c  | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
index aadf56e80bae8..d7a3b05ab50c3 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
@@ -691,8 +691,12 @@ void mt7915_unregister_device(struct mt7915_dev *dev)
 	spin_lock_bh(&dev->token_lock);
 	idr_for_each_entry(&dev->token, txwi, id) {
 		mt7915_txp_skb_unmap(&dev->mt76, txwi);
-		if (txwi->skb)
-			dev_kfree_skb_any(txwi->skb);
+		if (txwi->skb) {
+			struct ieee80211_hw *hw;
+
+			hw = mt76_tx_status_get_hw(&dev->mt76, txwi->skb);
+			ieee80211_free_txskb(hw, txwi->skb);
+		}
 		mt76_put_txwi(&dev->mt76, txwi);
 	}
 	spin_unlock_bh(&dev->token_lock);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index a264e304a3dfb..5800b2d1fb233 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -844,7 +844,7 @@ mt7915_tx_complete_status(struct mt76_dev *mdev, struct sk_buff *skb,
 	if (sta || !(info->flags & IEEE80211_TX_CTL_NO_ACK))
 		mt7915_tx_status(sta, hw, info, NULL);
 
-	dev_kfree_skb(skb);
+	ieee80211_free_txskb(hw, skb);
 }
 
 void mt7915_txp_skb_unmap(struct mt76_dev *dev,
-- 
2.25.1