Date: Thu, 15 Jan 2009 13:02:16 -0800
From: Greg KH <greg@kroah.com>
To: "Luis R. Rodriguez" <lrodriguez@atheros.com>
Cc: Luis Rodriguez <Luis.Rodriguez@Atheros.com>,
	Joseph Cheek <joseph@cheek.com>,
	"stable@kernel.org" <stable@kernel.org>,
	"ath9k-devel@lists.ath9k.org" <ath9k-devel@venema.h4ckr.net>,
	"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Subject: Re: [stable] [ath9k-devel] 2.6.2{7, 8} with
	compat-wireless-2008-12-3{0, 1) drops link every 2-3 minutes
Message-ID: <20090115210216.GA22843@kroah.com> (sfid-20090115_220528_764915_4B116FC0)
References: <495C7640.8060806@cheek.com> <20090105170432.GA6834@tesla> <20090115183703.GB10674@kroah.com> <20090115202550.GB29609@tesla>
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In-Reply-To: <20090115202550.GB29609@tesla>
Sender: linux-wireless-owner@vger.kernel.org

On Thu, Jan 15, 2009 at 12:25:50PM -0800, Luis R. Rodriguez wrote:
> On Thu, Jan 15, 2009 at 10:37:03AM -0800, Greg KH wrote:
> > On Mon, Jan 05, 2009 at 09:04:32AM -0800, Luis R. Rodriguez wrote:
> > > On Wed, Dec 31, 2008 at 11:52:32PM -0800, Joseph Cheek wrote:
> > > > Hi all,
> > > >
> > > > Happy New Year!  It's about 2:30 AM here and I'm up debugging my shiny
> > > > new DWA-552 <AR5416+AR2133> XtremeN Desktop Adapter.  Stock 2.6.28 gave
> > > > me the dreaded "No ProbeResp from current AP" in syslog with a
> > > > disconnect every few minutes, even after updating
> > > > |IEEE80211_MONITORING_INTERVAL to (100 * HZ).  It's highly annoying.
> > >
> > > This should be due to the fact that the RX filter disabled beaconing from
> > > the current AP and mac80211 expects beacons from the AP. This was fixed
> > > in wireless-testing but I do not see this pushed out for 2.6.28.
> > >
> > > Greg, this was fixed in Linus' tree via ffb826767bffda61426d964a8fc24a216a14b0bd,
> > > merged by John on Fri, 21 Nov 2008, the patch is titled:
> > > "ath9k: enable RXing of beacons on STA/IBSS". Just in case I've
> > > provided the hunk below. Without this patch users will face this disconnect
> > > issue on noisy environments where the beacons don't reach mac80211 within
> > > a certain time frame dicated by mac80211.
> > 
> > Thanks, I'll queue this up for 2.6.28, but it doesn't apply to
> > 2.6.27-stable.  If you want it there, can you please provide a backport
> > for it?
> 
> Thanks Greg -- it seems this was actually present in 2.6.27 since the
> initial commit of ath9k. From the initial commit I see:
> 
> --- on ath_calcrxfilter()
>         if (sc->sc_opmode == ATH9K_M_STA || sc->sc_opmode == ATH9K_M_IBSS ||
>             sc->sc_scanning)
>                 rfilt |= ATH9K_RX_FILTER_BEACON;
> ---
> 
> Seems we're good on 27 for this and this actually turned out to be a regression then.

Thanks for confirming it,

greg k-h