From owner-freebsd-usb@FreeBSD.ORG  Sun Feb  1 18:39:17 2009
Return-Path: <owner-freebsd-usb@FreeBSD.ORG>
Delivered-To: freebsd-usb@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id EE7B2106566C;
	Sun,  1 Feb 2009 18:39:17 +0000 (UTC) (envelope-from imp@bsdimp.com)
Received: from harmony.bsdimp.com (bsdimp.com [199.45.160.85])
	by mx1.freebsd.org (Postfix) with ESMTP id AF0308FC18;
	Sun,  1 Feb 2009 18:39:17 +0000 (UTC) (envelope-from imp@bsdimp.com)
Received: from localhost (localhost [127.0.0.1])
	by harmony.bsdimp.com (8.14.2/8.14.1) with ESMTP id n11Iaj3g093459;
	Sun, 1 Feb 2009 11:36:45 -0700 (MST) (envelope-from imp@bsdimp.com)
Date: Sun, 01 Feb 2009 11:37:14 -0700 (MST)
Message-Id: <20090201.113714.-887896087.imp@bsdimp.com>
To: hselasky@c2i.net
From: "M. Warner Losh" <imp@bsdimp.com>
In-Reply-To: <200902011937.32679.hselasky@c2i.net>
References: <20090201175021.GA32503@citylink.fud.org.nz>
	<20090201.112459.717301987.imp@bsdimp.com>
	<200902011937.32679.hselasky@c2i.net>
X-Mailer: Mew version 5.2 on Emacs 21.3 / Mule 5.0 (SAKAKI)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: freebsd-usb@freebsd.org, thompsa@freebsd.org
Subject: Re: USB2 patches
X-BeenThere: freebsd-usb@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: FreeBSD support for USB <freebsd-usb.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-usb>,
	<mailto:freebsd-usb-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-usb>
List-Post: <mailto:freebsd-usb@freebsd.org>
List-Help: <mailto:freebsd-usb-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-usb>,
	<mailto:freebsd-usb-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 01 Feb 2009 18:39:18 -0000

In message: <200902011937.32679.hselasky@c2i.net>
            Hans Petter Selasky <hselasky@c2i.net> writes:
: Hi Warner,
: 
: On Sunday 01 February 2009, M. Warner Losh wrote:
: > In message: <20090201175021.GA32503@citylink.fud.org.nz>
: >
: >             Andrew Thompson <thompsa@freebsd.org> writes:
: 
: > The only way that a 'deferred attach' makes sense is 
: 
: > if the ifnet and other external resources are setup as part of 
: > that deferred attach. That way, you don't have the NULL pointer issue.
: 
: That was what the initial code did.
: 
: >
: > However, doing that introduces races with devd, which are a pita to
: > cope with...  Even without deferring the setting up if ifnet, you have
: > races with devd if you defer things in attach that can be hard to cope
: > with in the code.
: 
: No, not if the ifnet attach is deferred too.
: 
: My conclusion is: Do not make match rules for "rumX/uralX/zydX", instead match 
: for the IFNET event in devd.conf.
: 
: 	devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL);

Yes.  We already do that.  I was thinking of the geom/device race that
we haven't closed rather than this race which we have.

Warner