From c34f100590f1239811db576d9923e77b75f627db Mon Sep 17 00:00:00 2001
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Mon, 13 Sep 2021 11:25:04 +0200
Subject: [PATCH] mt76: substitute sk_buff_head status_list with spinlock_t status_lock
Git-commit: c34f100590f1239811db576d9923e77b75f627db
Patch-mainline: v5.16-rc1
References: bsc#1209980

Substitute sk_buff_head status_list with spinlock_t status_lock since we
just need it for locking

Tested-by: mrkiko.rs@gmail.com
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/mediatek/mt76/mac80211.c |  2 +-
 drivers/net/wireless/mediatek/mt76/mt76.h     |  7 ++++---
 drivers/net/wireless/mediatek/mt76/tx.c       | 14 +++++++-------
 3 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mac80211.c b/drivers/net/wireless/mediatek/mt76/mac80211.c
index 61fff98c1fd6..831717d9638c 100644
--- a/drivers/net/wireless/mediatek/mt76/mac80211.c
+++ b/drivers/net/wireless/mediatek/mt76/mac80211.c
@@ -543,9 +543,9 @@ mt76_alloc_device(struct device *pdev, unsigned int size,
 	spin_lock_init(&dev->rx_lock);
 	spin_lock_init(&dev->lock);
 	spin_lock_init(&dev->cc_lock);
+	spin_lock_init(&dev->status_lock);
 	mutex_init(&dev->mutex);
 	init_waitqueue_head(&dev->tx_wait);
-	skb_queue_head_init(&dev->status_list);
 
 	skb_queue_head_init(&dev->mcu.res_q);
 	init_waitqueue_head(&dev->mcu.wait);
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 1c18e75c3f6a..8c617fe2d551 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -693,7 +693,8 @@ struct mt76_dev {
 	int token_count;
 
 	wait_queue_head_t tx_wait;
-	struct sk_buff_head status_list;
+	/* spinclock used to protect wcid pktid linked list */
+	spinlock_t status_lock;
 
 	u32 wcid_mask[DIV_ROUND_UP(MT76_N_WCIDS, 32)];
 	u32 wcid_phy_mask[DIV_ROUND_UP(MT76_N_WCIDS, 32)];
@@ -1097,9 +1098,9 @@ void mt76_wcid_key_setup(struct mt76_dev *dev, struct mt76_wcid *wcid,
 			 struct ieee80211_key_conf *key);
 
 void mt76_tx_status_lock(struct mt76_dev *dev, struct sk_buff_head *list)
-			 __acquires(&dev->status_list.lock);
+			 __acquires(&dev->status_lock);
 void mt76_tx_status_unlock(struct mt76_dev *dev, struct sk_buff_head *list)
-			   __releases(&dev->status_list.lock);
+			   __releases(&dev->status_lock);
 
 int mt76_tx_status_skb_add(struct mt76_dev *dev, struct mt76_wcid *wcid,
 			   struct sk_buff *skb);
diff --git a/drivers/net/wireless/mediatek/mt76/tx.c b/drivers/net/wireless/mediatek/mt76/tx.c
index 8b4c6ce900ee..ef75f168ba82 100644
--- a/drivers/net/wireless/mediatek/mt76/tx.c
+++ b/drivers/net/wireless/mediatek/mt76/tx.c
@@ -38,21 +38,21 @@ EXPORT_SYMBOL_GPL(mt76_tx_check_agg_ssn);
 
 void
 mt76_tx_status_lock(struct mt76_dev *dev, struct sk_buff_head *list)
-		   __acquires(&dev->status_list.lock)
+		   __acquires(&dev->status_lock)
 {
 	__skb_queue_head_init(list);
-	spin_lock_bh(&dev->status_list.lock);
+	spin_lock_bh(&dev->status_lock);
 }
 EXPORT_SYMBOL_GPL(mt76_tx_status_lock);
 
 void
 mt76_tx_status_unlock(struct mt76_dev *dev, struct sk_buff_head *list)
-		      __releases(&dev->status_list.lock)
+		      __releases(&dev->status_lock)
 {
 	struct ieee80211_hw *hw;
 	struct sk_buff *skb;
 
-	spin_unlock_bh(&dev->status_list.lock);
+	spin_unlock_bh(&dev->status_lock);
 
 	rcu_read_lock();
 	while ((skb = __skb_dequeue(list)) != NULL) {
@@ -130,7 +130,7 @@ mt76_tx_status_skb_add(struct mt76_dev *dev, struct mt76_wcid *wcid,
 			     IEEE80211_TX_CTL_RATE_CTRL_PROBE)))
 		return MT_PACKET_ID_NO_SKB;
 
-	spin_lock_bh(&dev->status_list.lock);
+	spin_lock_bh(&dev->status_lock);
 
 	pid = idr_alloc(&wcid->pktid, skb, MT_PACKET_ID_FIRST,
 			MT_PACKET_ID_MASK, GFP_ATOMIC);
@@ -147,7 +147,7 @@ mt76_tx_status_skb_add(struct mt76_dev *dev, struct mt76_wcid *wcid,
 		list_add_tail(&wcid->list, &dev->wcid_list);
 
 out:
-	spin_unlock_bh(&dev->status_list.lock);
+	spin_unlock_bh(&dev->status_lock);
 
 	return pid;
 }
@@ -160,7 +160,7 @@ mt76_tx_status_skb_get(struct mt76_dev *dev, struct mt76_wcid *wcid, int pktid,
 	struct sk_buff *skb;
 	int id;
 
-	lockdep_assert_held(&dev->status_list.lock);
+	lockdep_assert_held(&dev->status_lock);
 
 	skb = idr_remove(&wcid->pktid, pktid);
 	if (skb)
-- 
2.35.3