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Subject: Re: Issue with ifconfig down and 4965 driver
From: Marcel Holtmann <holtmann@linux.intel.com>
To: reinette chatre <reinette.chatre@intel.com>
Cc: linux-wireless <linux-wireless@vger.kernel.org>
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Date: Thu, 04 Dec 2008 12:19:51 +0100
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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.

Regards

Marcel