Question: ieee80211_rx called twice after one ieee80211_subif_start_xmit call

Hi sirs,

	Today, I noticed that when an data frame is sent by
ieee80211_subif_start_xmit, then ieee80211_rx will be called twice , first
is an Acknowledgement frame and second is the response data frame.  Is this
the normal case?   It seems the RA frame is nonsense and just be freed in
ieee80211_rx_monitor.

	Is there anyway to tell the hardware not report RA frame to
mac80211?


Thanks very much!

Li gang