linux-kernel - Re: Bisected 3.9 regression for iwl4965 connection problem to 1672c0e3

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Message-ID: <20130507153525.GB1576@redhat.com>
Date:	Tue, 7 May 2013 17:35:25 +0200
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Jake Edge <jake@....net>, linux-wireless@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: Bisected 3.9 regression for iwl4965 connection problem to
 1672c0e3

On Tue, May 07, 2013 at 03:53:30PM +0200, Johannes Berg wrote:
> > > I think the best way to solve this would be to do such a thing in
> > > iwlegacy as well, but until then and for stable maybe we should
> > > introduce another HW flag to restore the previous mac80211 behaviour?
> > 
> > I'm not sure if I like to add passive_no_rx to iwlegacy. Stopping queues
> > and waiting for beacon looks sticky, what happen if beacon will not be
> > received?
> 
> Good question, do we get stuck? I was assuming we'd time out, but maybe
> that's not the case?

AFICT, we wake queues only if beacon arrives or mac80211 call drv_config
with BSS_CHANGED_IDLE. I'm not sure if the latter prevent stuck. 

> > Perhaps I will just remove IEEE80211_HW_REPORTS_TX_ACK_STATUS from 4965,
> > it's simpler workaround ?
> 
> Sure, but maybe that loses other semantics that you want?
> 
> And anyway it's not complete. If you have a very long beacon interval
> (say 1 second) then this could still lead to all probe/auth retries
> going out inbetween two beacons since the timeout is just 3*100ms.

Let's make that change as temporary regression workaround, I'll add
passive_no_rx workaround latter. I'll also think if it can stuck or
not.

Stanislaw
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