Re: ath9k becon loss messages

[Kalle Valo <kalle.valo@iki.fi>]

Michael Buesch <mb@bu3sch.de> writes:

>> NetworkManager typically scans every 120 seconds and I can also trigger
>> the messages by a manual scan with iwlist. I did not dig any further but
>> the messages seem to appear right at the end of the scan. Tried with iwlagn
>> and both sw_scan and hw_scan.
>
> Yeah OK. While scanning it's expected to lose some frames.
>
> However, the driver should probably protect against this by using the
> scan notification callbacks. It could disable beacon-loss reporting
> while scanning.

That case is already covered. In sw_scan mac80211 will disable power
save and hence beacon filter is also disabled. With hw_scan the firmware
should be clever enough to not emit beacon loss events when scanning.

But ath9k nor iwlwifi don't support beacon filtering and this is a
problem in mac80211. We need to disable the beacon loss check in
mac80211, most probably by stopping the associated timer whenever
scanning.

-- 
Kalle Valo