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>
In-Reply-To: <1228249643.10900.59.camel@rc-desk>
References: <BCB72601-9DA2-4D89-BDF1-7B96254DA17C@linux.intel.com>
	 <1226555293.1115.939.camel@rc-desk>  <491BF73B.4080403@linux.intel.com>
	 <1228249643.10900.59.camel@rc-desk>
Content-Type: text/plain
Date: Thu, 04 Dec 2008 00:38:38 +0100
Message-Id: <1228347518.9181.15.camel@violet.holtmann.net> (sfid-20081204_003844_696863_495596B3)
Mime-Version: 1.0
Sender: linux-wireless-owner@vger.kernel.org

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.

Regards

Marcel