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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Ryder Lee <ryder.lee@mediatek.com>, Bo Jiao <bo.jiao@mediatek.com>,
        Felix Fietkau <nbd@nbd.name>, Sasha Levin <sashal@kernel.org>,
        linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org
Subject: [PATCH AUTOSEL 5.11 11/67] mt76: mt7915: reset token when mac_reset happens
Date:   Wed, 24 Feb 2021 07:49:29 -0500
Message-Id: <20210224125026.481804-11-sashal@kernel.org>
In-Reply-To: <20210224125026.481804-1-sashal@kernel.org>
References: <20210224125026.481804-1-sashal@kernel.org>
MIME-Version: 1.0
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From: Ryder Lee <ryder.lee@mediatek.com>

[ Upstream commit f285dfb98562e8380101095d168910df1d07d8be ]

Reset buffering token in mt7915_mac_reset_work() to avoid possible leakege,
which leads to Tx stop after mac reset.

Tested-by: Bo Jiao <bo.jiao@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../net/wireless/mediatek/mt76/mt7915/init.c  | 18 +-------------
 .../net/wireless/mediatek/mt76/mt7915/mac.c   | 24 +++++++++++++++++++
 .../wireless/mediatek/mt76/mt7915/mt7915.h    |  1 +
 3 files changed, 26 insertions(+), 17 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
index 102a8f14c22d4..2ec18aaa82807 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
@@ -672,28 +672,12 @@ int mt7915_register_device(struct mt7915_dev *dev)
 
 void mt7915_unregister_device(struct mt7915_dev *dev)
 {
-	struct mt76_txwi_cache *txwi;
-	int id;
-
 	mt7915_unregister_ext_phy(dev);
 	mt76_unregister_device(&dev->mt76);
 	mt7915_mcu_exit(dev);
 	mt7915_dma_cleanup(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) {
-			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);
-		dev->token_count--;
-	}
-	spin_unlock_bh(&dev->token_lock);
-	idr_destroy(&dev->token);
+	mt7915_tx_token_put(dev);
 
 	mt76_free_device(&dev->mt76);
 }
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
index f504eeb221f95..1b4d65310b887 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c
@@ -1485,6 +1485,27 @@ mt7915_dma_reset(struct mt7915_phy *phy)
 		 MT_WFDMA1_GLO_CFG_TX_DMA_EN | MT_WFDMA1_GLO_CFG_RX_DMA_EN);
 }
 
+void mt7915_tx_token_put(struct mt7915_dev *dev)
+{
+	struct mt76_txwi_cache *txwi;
+	int id;
+
+	spin_lock_bh(&dev->token_lock);
+	idr_for_each_entry(&dev->token, txwi, id) {
+		mt7915_txp_skb_unmap(&dev->mt76, txwi);
+		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);
+		dev->token_count--;
+	}
+	spin_unlock_bh(&dev->token_lock);
+	idr_destroy(&dev->token);
+}
+
 /* system error recovery */
 void mt7915_mac_reset_work(struct work_struct *work)
 {
@@ -1525,6 +1546,9 @@ void mt7915_mac_reset_work(struct work_struct *work)
 
 	mt76_wr(dev, MT_MCU_INT_EVENT, MT_MCU_INT_EVENT_DMA_STOPPED);
 
+	mt7915_tx_token_put(dev);
+	idr_init(&dev->token);
+
 	if (mt7915_wait_reset_state(dev, MT_MCU_CMD_RESET_DONE)) {
 		mt7915_dma_reset(&dev->phy);
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h b/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
index 0339abf360d3f..94bed8a3a050a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h
@@ -463,6 +463,7 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
 			  struct ieee80211_sta *sta,
 			  struct mt76_tx_info *tx_info);
 void mt7915_tx_complete_skb(struct mt76_dev *mdev, struct mt76_queue_entry *e);
+void mt7915_tx_token_put(struct mt7915_dev *dev);
 int mt7915_init_tx_queues(struct mt7915_phy *phy, int idx, int n_desc);
 void mt7915_queue_rx_skb(struct mt76_dev *mdev, enum mt76_rxq_id q,
 			 struct sk_buff *skb);
-- 
2.27.0