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Date: Tue, 10 Jan 2012 10:30:24 -0800
Message-ID: <CAJ-Vmo=XnY5ouzB76Ncpk=UDzRxP8qtm5HNngRs9mXkY9joRnw@mail.gmail.com>
From: Adrian Chadd <adrian.chadd@gmail.com>
To: Joel Dahl <joel@freebsd.org>
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Cc: freebsd-wireless@freebsd.org
Subject: Re: kern/163318: [ath] ath(4) stops working
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Hi,

On 10 January 2012 10:00, Joel Dahl <joel@freebsd.org> wrote:

> =A0For the record: I put in another PCI ath(4) card and I'm seeing the sa=
me
> =A0thing with this card. After a while, wireless stops working. It seems =
to
> =A0go in to some power save mode, and then gets stuck. ifconfig wlan0 sca=
n
> =A0fixes it, as usual.
>
> =A0One thing I've noticed though is that it seems to take much longer for=
 this
> =A0card to stop working. Usually around 9-10 hours. Could be a coincidenc=
e of
> =A0course.

Hm. Right, I didn't think it was chipset specific. I think it's very
likely another subtle race condition inside net80211 which we just
haven't properly fixed.

The scan stuff _should_ be running in the net80211 taskqueue (which
one exists per interface, iirc.) So it shouldn't be racing with
itself, but it may be racing with other bits.

I'm trying to reproduce it here, but I won't have a dual-core machine
w/ an AR9220 ready for another week or two.


Adrian