---

yaml
---
r: 159393
b: refs/heads/master
c: c1be515
h: refs/heads/master
i:
  159391: 800e3ac
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3ad201496badddd8e1cda87ee6d29e8b3b8e1279
+refs/heads/master: c1be5152860218dffea6a47cff5ea31a56c6cff5

trunk/drivers/net/wireless/b43legacy/dma.c

@@ -1366,15 +1366,25 @@ int b43legacy_dma_tx(struct b43legacy_wldev *dev,
 	ring = priority_to_txring(dev, skb_get_queue_mapping(skb));
 	spin_lock_irqsave(&ring->lock, flags);
 	B43legacy_WARN_ON(!ring->tx);
-	if (unlikely(free_slots(ring) < SLOTS_PER_PACKET)) {
-		b43legacywarn(dev->wl, "DMA queue overflow\n");
+
+	if (unlikely(ring->stopped)) {
+		/* We get here only because of a bug in mac80211.
+		 * Because of a race, one packet may be queued after
+		 * the queue is stopped, thus we got called when we shouldn't.
+		 * For now, just refuse the transmit. */
+		if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE))
+			b43legacyerr(dev->wl, "Packet after queue stopped\n");
+		err = -ENOSPC;
+		goto out_unlock;
+	}
+
+	if (unlikely(WARN_ON(free_slots(ring) < SLOTS_PER_PACKET))) {
+		/* If we get here, we have a real error with the queue
+		 * full, but queues not stopped. */
+		b43legacyerr(dev->wl, "DMA queue overflow\n");
 		err = -ENOSPC;
 		goto out_unlock;
 	}
-	/* Check if the queue was stopped in mac80211,
-	 * but we got called nevertheless.
-	 * That would be a mac80211 bug. */
-	B43legacy_BUG_ON(ring->stopped);
 
 	err = dma_tx_fragment(ring, skb);
 	if (unlikely(err == -ENOKEY)) {