Received:  by oss.sgi.com id <S42360AbQFUKhe>;
	Wed, 21 Jun 2000 03:37:34 -0700
Received: from laurin.munich.netsurf.de ([194.64.166.1]:53736 "EHLO
        laurin.munich.netsurf.de") by oss.sgi.com with ESMTP
	id <S42305AbQFUKhN>; Wed, 21 Jun 2000 03:37:13 -0700
Received: from fred.muc.de (none@ns1231.munich.netsurf.de [195.180.235.231])
	by laurin.munich.netsurf.de (8.9.3/8.9.3) with ESMTP id MAA04957;
	Wed, 21 Jun 2000 12:36:49 +0200 (MET DST)
Received: from andi by fred.muc.de with local (Exim 2.05 #1)
	id 134hdL-0000Fl-00; Wed, 21 Jun 2000 12:21:23 +0200
Date:   Wed, 21 Jun 2000 12:21:23 +0200
From:   Andi Kleen <ak@muc.de>
To:     Andrew Morton <andrewm@uow.edu.au>
Cc:     Andi Kleen <ak@muc.de>, "netdev@oss.sgi.com" <netdev@oss.sgi.com>
Subject: Re: modular net drivers, take 2
Message-ID: <20000621122123.A971@fred.muc.de>
References: <39500F81.46F5A826@uow.edu.au>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Mailer: Mutt 0.95.4us
In-Reply-To: <39500F81.46F5A826@uow.edu.au>; from Andrew Morton on Wed, Jun 21, 2000 at 02:44:03AM +0200
Sender: owner-netdev@oss.sgi.com
Precedence: bulk
Return-Path: <owner-netdev@oss.sgi.com>
X-Orcpt: rfc822;netdev-outgoing

On Wed, Jun 21, 2000 at 02:44:03AM +0200, Andrew Morton wrote:
> Andi Kleen wrote:
> > 
> > On Tue, Jun 20, 2000 at 02:04:35PM +0200, Andrew Morton wrote:
> > >
> > > - sys_ioctl() and sys_delete_module() both already claim
> > >   the big lock, so where's the race anyway?  I feel I'm missing
> > >   something..
> > 
> > Ugh, I missed that. Ok, with that there is no race. Even better :-)
> 
> I think I lied.  Look at this:

Ok. Just let's hope that no non-ioctl function grabs first a different
lock (like the rtnl_lock) and then does a lock_kernel(). That would
give a nice deadlock race.


-Andi

-- 
This is like TV. I don't like TV.