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

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Date:	Tue, 07 May 2013 15:53:30 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
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, 2013-05-07 at 10:42 +0200, Stanislaw Gruszka wrote:

> Can you explain why it is named passive_no_rx instead passive_no_tx ?

Emmanuel already commented on this, basically the error codes are all
for "I couldn't transmit this frame", so here we have "I couldn't
transmit this frame because it was on a _passive_ channel and there was
_no rx_ yet."

> > 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?

> 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.

johannes

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