After shutdown/restart, ath10k sometimes stops receiving packets

[Kalle Valo]

Avery Pennarun <apenwarr at gmail.com> writes:

> We are experiencing a relatively-rare-but-not-rare-enough case which
> has approximately these steps:
>
> - run a wifi AP for a while with a station or two connected
> - shut down hostapd (stations all get disconnected of course)
> - restart hostapd (perhaps on another channel or with different settings)
>
> After that, an external wifi sniffer can see beacons being transmitted
> by the AP as expected, but all packets from stations trying to connect
> are ignored.  In particular, Probe requests are not answered, and Auth
> requests do not even receive a wifi ACK.
>
> Restarting hostapd doesn't fix it.  However, rmmoding and modprobing
> the ath10k_pci module does fix it.
>
> This is with a mindspeed c2k host processor, 3.2 kernel, and modules
> backported by backports from kvalo's ath-next as of
> v3.15-rc1-237-gd9bc4b9 (roughly 2014-04-29).  Firmware is
> 10.1.467.2-1.
>
> Has anyone else seen this?  Any suggestions where to look to narrow
> down the problem?
>
> I can't exactly produce it on demand yet, but if someone suggests
> things to look for when it happens, it occurs often enough that I
> should be able tor run those things.

Do you have any guesses how often this happens? Once a day, once a week?

-- 
Kalle Valo