Dear John: recently, I found some issues on mac80211 scan about null packet. Before we switch channel in scanning, we will send null packet to AP to indicate that we will sleep. but at the same time there maybe lots of packets in HW tx buffer witch are all ready to tx but with out power save flag set to 1. if we send this null packet after these tx buffer packets in a low priority, this will cause follwing null packets fail because follwing check in __ieee80211_tx: if (local->queue_stop_reasons[q] || (!txpending && !skb_queue_empty(&local->pending[q]))) ret = IEEE80211_TX_PENDING; But if we send these null before there tx buffer packets packets in a high priority, these packets will be send after this null before switch channel. and switch channel will cause RX packet from AP fail abruptly, this abruptly fail will cause DELETE BA for some AP like Belkin-8233 11N mode or dis-associate by some AP like Dir855 5G 11N mode when we to test Throughput use chariot And I found that after power save null packet have been sent, there are lots packet send to driver from mac80211, should we stop all queues after we send power save null packet and recover all queues after we send awake null packet. So, I don't kown if it's a mac80211's issue, Could you give some help? Thank you! Best regards! lizhaoming -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
