Hi Alexander,
I don't know anything about the driver here but in mac80211 the idea to avoid the race is to simply flush the queues prior deleting the outgoing key.
Maybe a silly question, but what does flushing the queue mean in this context? Is it waiting for all the packets to be sent or dropping them on the floor?
Now wpa_supplicant is not yet bypassing qdisks, but adding the socket parameter PACKET_QDISC_BYPASS is basically a one-liner in wpa_supplicant and should allow a generic way for drivers to avoid the race with a simple queue flush...
Can you expand on this actually? What would the sequence of events be? Also, how would this be made to work with CONTROL_PORT over NL80211 ? Regards, -Denis
