Subject: Re: Issue with ifconfig down and 4965 driver
From: reinette chatre <reinette.chatre@intel.com>
To: Marcel Holtmann <holtmann@linux.intel.com>
Cc: linux-wireless <linux-wireless@vger.kernel.org>
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Date: Thu, 04 Dec 2008 09:23:46 -0800
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Sender: linux-wireless-owner@vger.kernel.org

On Thu, 2008-12-04 at 03:19 -0800, Marcel Holtmann wrote:
> Hi Reinette,
> 
> > > > > >> so I am running a 2.6.28-rc4 kernel and every time I stop
> > > > > >> wpa_supplicant or call ifconfig down on the 4965 card, I get a user
> > > > > >> noticeable delay (mouse freezes). Seems that some part inside the
> > > > > >> driver is actively sleeping with a busy-loop. This is really not an
> > > > > >> acceptable behavior since it is a day-to-day task to bring the device
> > > > > >> down. And for power concerns, we really wanna allow to bring down the
> > > > > >> interface.
> > > > > >>
> > > > > >
> > > > > > Please add your information to
> > > > > > http://www.intellinuxwireless.org/bugzilla/show_bug.cgi?id=1790
> > > > > 
> > > > > all information are already in the Bugzilla. It is nothing fancy and
> > > > > easy to reproduce. Do we have a patch for it?
> > > > > 
> > > > 
> > > > http://marc.info/?l=linux-wireless&m=122824886623698&w=2
> > > 
> > > so I finally got around testing the patch. It is great that it reduces
> > > the time drastically, but I think that it is still not good enough. So I
> > > don't care how long it takes to bring the device down. My concern is
> > > that we are busy-looping during this time. Meaning the kernel is not
> > > responding to anything. Simple symptom is that the mouse is stuck.
> > > 
> > 
> > We have found that this one patch is not the full solution. More work is
> > currently being done with activity tracked at
> > http://www.intellinuxwireless.org/bugzilla/show_bug.cgi?id=1790
> 
> I quickly checked Mohamed's last patch. It actually makes it worse on my
> system.

Thank you very much for testing - I will let him know. Would it be
possible to add your feedback to that bug report for visibility to
everybody tracking that problem? Not everybody there are subscribed to
linux-wireless and other people testing the patch (see last comment #12)
reports that the issue is solved for them.

Thank you very much

Reinette