wifi: mt76: fix linked list corruption

Never leave scheduled wcid entries on the temporary on-stack list

Fixes: 0b3be9d ("wifi: mt76: add separate tx scheduling queue for off-channel tx")
Link: https://patch.msgid.link/20250827085352.51636-6-nbd@nbd.name
Signed-off-by: Felix Fietkau <nbd@nbd.name>

Author: nbd168

drivers/net/wireless/mediatek/mt76/tx.c

@@ -646,6 +646,7 @@ mt76_txq_schedule_pending_wcid(struct mt76_phy *phy, struct mt76_wcid *wcid,
 static void mt76_txq_schedule_pending(struct mt76_phy *phy)
 {
 	LIST_HEAD(tx_list);
+	int ret = 0;
 
 	if (list_empty(&phy->tx_list))
 		return;
@@ -657,13 +658,13 @@ static void mt76_txq_schedule_pending(struct mt76_phy *phy)
 	list_splice_init(&phy->tx_list, &tx_list);
 	while (!list_empty(&tx_list)) {
 		struct mt76_wcid *wcid;
-		int ret;
 
 		wcid = list_first_entry(&tx_list, struct mt76_wcid, tx_list);
 		list_del_init(&wcid->tx_list);
 
 		spin_unlock(&phy->tx_lock);
-		ret = mt76_txq_schedule_pending_wcid(phy, wcid, &wcid->tx_offchannel);
+		if (ret >= 0)
+			ret = mt76_txq_schedule_pending_wcid(phy, wcid, &wcid->tx_offchannel);
 		if (ret >= 0 && !phy->offchannel)
 			ret = mt76_txq_schedule_pending_wcid(phy, wcid, &wcid->tx_pending);
 		spin_lock(&phy->tx_lock);
@@ -672,9 +673,6 @@ static void mt76_txq_schedule_pending(struct mt76_phy *phy)
 		    !skb_queue_empty(&wcid->tx_offchannel) &&
 		    list_empty(&wcid->tx_list))
 			list_add_tail(&wcid->tx_list, &phy->tx_list);
-
-		if (ret < 0)
-			break;
 	}
 	spin_unlock(&phy->tx_lock);