[ath9k-devel] still same problem

[Luis R. Rodriguez <lrodriguez@atheros.com>]

On Sun, Jan 18, 2009 at 01:34:03AM -0800, W. van den Akker wrote:
> On Sunday 18 January 2009, Dmitri Seletski wrote:
> > W. van den Akker wrote:
> > > On Sunday 04 January 2009 10:58:02 Jens Ott - Opteamax wrote:
> > >> Hi,
> > >>
> > >> Luis R. Rodriguez schrieb:
> > >>> On Sat, Jan 3, 2009 at 5:53 PM, Barry Green <barry@lemonpi.net> wrote:
> > >>> [...]
> > >>> We need an oops trace of your crashes so far it seems you have not
> > >>> been able to get one, lets work on that. Until then it is not easy for
> > >>> us to provide you with patches to fix your issues.
> > >>
> > >> I also have similar problems with an D-LINK DWA-547 and I'd really like
> > >> to provide the oops trace, but unfortunately the machine seems to hang
> > >> that fast, that even no oops trace is shown. Also magic-sysreq don't
> > >> work anymore, neither via serial console nor via keyboard. Only chance I
> > >> have in this moment is to press reset-button, which already caused a
> > >> full xfs-filsystem-corruption with dataloss once :-(
> > >>
> > >> My problem is, that the hang happens not immediately after loading the
> > >> driver but "somewhen" while it is loaded.
> > >>
> > >> I have seen two types of crash:
> > >>
> > >> 1.) first investigations on my side seem to show that it happens, as
> > >> soon as there is high dataload transfered, but I don't have detailed
> > >> info yet.
> > >> 2.) Running hostapd works fine while started first time, but no client
> > >> is connected. When a client connects a system freeze occures
> > >> "sometimes". Reproducably the system freezes immediately when starting
> > >> hostapd, stop it and then restart hostapd. So every change in hostapd
> > >> conf needs a full reboot, unloading the ath9k module and reload it does
> > >> not prevent freeze, but after reboot I can start hostapd once without a
> > >> problem (only the metioned "sometime" freezes on client connect or high
> > >> data-volume).
> > >>
> > >> As this machine is productive, I suspended testing for now. I will
> > >> change the card into a non-productive environment in the next days. As
> > >> soon as I find more details, I'll report.
> > >>
> > >>> Please test with the latest drivers from
> > >>> wireless-testing/compat-wireless and restart in single user mode, we
> > >>> want to ensure X is not running at all and you are in a virtual
> > >>> terminal. We also do not want Network Manager or wpa_supplicant
> > >>> running in the background. To increase the resolution upon bootup try
> > >>> booting with vga=ask (vga=791 works well for me), then try to
> > >>> associate to your access point without encryption manually using
> > >>> iwconfig.
> > >>
> > >> Ok, that'll be a thing I'd need to test to, as in my case wpa_supplicant
> > >> is running.
> > >
> > > Hi,
> > >
> > > What is the status of your problem? I still have problems with it and
> > > have no progress...
> > >
> > > gr,
> > > Willem
> >
> > Hello Willem.
> >
> > I think I have had similar issue to yours.
> >
> > Car was working for short period of time and after a while crashed
> > computer. I was advised to change kernel version, i updated it to 2.6.27.9
> > and problem has gone away since.
> > It's something to do with DMA.
> >
> > Perhaps try to upgrade kernel?
> >
> > Regards
> > Dmitri
> 
> I have tried all kernel versions till 2.6.28 and still have the same hang-ups.
> I think indeed its a DMA-hardware-ath9k related problem.  The patch in
> 2.6.27.8 didnt work for me. I have filled a bugreport on bugzilla.kernel but
> because AP isnt supported untill 2.6.29 the report is closed.

A better description of this is that AP support does not work (is not allowed)
and therefore not supported on < 2.6.28.

> I will test today 2.6.29.rc2 and see if it has any progress.

You can also try wireless-testing (entire kernel) or compat-wireless (just updates
your wireless stuff) for bleeding edge stuff.

http://wireless.kernel.org/en/developers/Documentation/git-guide
http://wireless.kernel.org/en/users/Download

  Luis