mt76: throttle transmission of buffered multicast packets

Avoids drowning out regular transmissions
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c

@@ -121,9 +121,10 @@ static void mt76x02_pre_tbtt_tasklet(unsigned long arg)
 		ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev),
 			IEEE80211_IFACE_ITER_RESUME_ALL,
 			mt76x02_add_buffered_bc, &data);
-	} while (nframes != skb_queue_len(&data.q));
+	} while (nframes != skb_queue_len(&data.q) &&
+		 skb_queue_len(&data.q) < 8);
 
-	if (!nframes)
+	if (!skb_queue_len(&data.q))
 		return;
 
 	for (i = 0; i < ARRAY_SIZE(data.tail); i++) {