Deauthentication of inactive STA causes a error

[Jiri Fojtasek]

Jiri Fojtasek wrote:

> Hello Jouni
>
> Iam trying to solve problem with random disassociatoin of my WDS 
> clients (in cause of few minutes not responding from my WDS clients). 
> I have done for this reason  a patch that that give me for this reason 
> more detailed informations about the "Could not find STA for this TX 
> error" error message ...
>
> I have found that the deauthentication frame always followed by this 
> message:
>
> wlan0: STA 00:02:72:00:0f:f8 did not ACK activity poll frame
> wlan0: sending disassociation info to STA 
> xx:xx:xx:xx:xx:xx(last=2189385, jiffies=2219485)
> wlan0: sending deauthentication info to STA 
> xx:xx:xx:xx:xx:xx(last=2189385, jiffies=2219585)
> wlan0: Could not find STA xx:xx:xx:xx:xx:xx for this TX error 
> (jiffies=2219585)
>
> (xx:xx:xx:xx:xx:xx is mac of the STA being deauthenticated)
>
> I think it mean that deauth frame is not sent ...
>
> I have took a deep look for this problem, and have found that in the 
> hostap_ap.c, exactly in the ap_handle_timer function is imediatly 
> after sending the deauth frame is the sta dealocated by ap_free_sta, 
> so i think the delivery od the deauth frame must fail ...
>
> I think the solution should be by calling  the "ap_free_sta" in next 
> sheduled of the "ap_handle_timer" event .
>
> PS: I had the same problem before you fix the activity pooling ...
>
> Jiri
>
>
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Next proof . Txexc event is called in next jiffies:

wlan0: STA xx:xx:xx:xx:xx:xx did not ACK activity poll frame
wlan0: sending disassociation info to STA 
xx:xx:xx:xx:xx:xx(last=2360077, jiffies=2390177)
wlan0: sending deauthentication info to STA 
xx:xx:xx:xx:xx:xx(last=2360077, jiffies=2390277)
wlan0: Could not find STA xx:xx:xx:xx:xx:xx for this TX error 
(jiffies=2390278)

Jiri