mt76: mt7615: schedule tx tasklet and sta poll on mac tx free

Unlike on earlier chips, DMA completion on MT7615 does not imply actually
having sent out any packets.
Since AQL will prevent filling the hardware queues and will only allow more
packets to be passed to the driver after tx completion, it makes much more
sense to schedule the tx tasklet there.
This is also needed for scheduling tx in testmode support
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/dma.c

@@ -122,10 +122,6 @@ static int mt7615_poll_tx(struct napi_struct *napi, int budget)
 
 	mt7615_tx_cleanup(dev);
 
-	rcu_read_lock();
-	mt7615_mac_sta_poll(dev);
-	rcu_read_unlock();
-
 	tasklet_schedule(&dev->mt76.tx_tasklet);
 
 	return 0;

drivers/net/wireless/mediatek/mt76/mt7615/mac.c

@@ -1399,6 +1399,12 @@ static void mt7615_mac_tx_free(struct mt7615_dev *dev, struct sk_buff *skb)
 	}
 
 	dev_kfree_skb(skb);
+
+	rcu_read_lock();
+	mt7615_mac_sta_poll(dev);
+	rcu_read_unlock();
+
+	tasklet_schedule(&dev->mt76.tx_tasklet);
 }
 
 void mt7615_queue_rx_skb(struct mt76_dev *mdev, enum mt76_rxq_id q,