Hi, I am trying to debug brcmsmac wireless driver for spamming the log with the message: [...] START: tid 2 is not agg'able for it does not support AMPDU aggreggation for TID 2. And after quick tracing, I found that mac80211 keeps trying to start AMPDU session for the _same TID and STA_ despite that the driver returns non-zero code via its ampdu_action callback and that non-zero return codes are recognized as the "HW unavailable" for such session (agg-tx.c:ieee80211_tx_ba_session_handle_start) So, Is that an expected behaviour from mac80211 or not?? Regards, Ali MJ