mt76: usb: avoid queue/status spinlocks while passing tx status to mac80211

As already done for pcie code in commit 79d1c94c9c78 ("mt76: avoid
queue/status spinlocks while passing tx status to mac80211") make sure
that no tx related spinlocks are taken during the ieee80211_tx_status call

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/usb.c b/drivers/net/wireless/mediatek/mt76/usb.c
index 14ff06c..6a25075 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/usb.c
+++ b/drivers/net/wireless/mediatek/mt76/usb.c
@@ -583,6 +583,7 @@ static void mt76u_stop_rx(struct mt76_dev *dev)
 static void mt76u_tx_tasklet(unsigned long data)
 {
        struct mt76_dev *dev = (struct mt76_dev *)data;
+       struct mt76_queue_entry entry;
        struct mt76u_buf *buf;
        struct mt76_queue *q;
        bool wake;
@@ -597,17 +598,18 @@ static void mt76u_tx_tasklet(unsigned long data)
                        if (!buf->done || !q->queued)
                                break;
 
-                       dev->drv->tx_complete_skb(dev, q,
-                                                 &q->entry[q->head],
-                                                 false);
-
                        if (q->entry[q->head].schedule) {
                                q->entry[q->head].schedule = false;
                                q->swq_queued--;
                        }
 
+                       entry = q->entry[q->head];
                        q->head = (q->head + 1) % q->ndesc;
                        q->queued--;
+
+                       spin_unlock_bh(&q->lock);
+                       dev->drv->tx_complete_skb(dev, q, &entry, false);
+                       spin_lock_bh(&q->lock);
                }
                mt76_txq_schedule(dev, q);
                wake = i < IEEE80211_NUM_ACS && q->queued < q->ndesc - 8;