From owner-freebsd-drivers@FreeBSD.ORG  Fri Jan 20 07:28:03 2006
Return-Path: <owner-freebsd-drivers@FreeBSD.ORG>
X-Original-To: freebsd-drivers@freebsd.org
Delivered-To: freebsd-drivers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id EE39916A42C;
	Fri, 20 Jan 2006 07:28:03 +0000 (GMT) (envelope-from NKoch@demig.de)
Received: from server.absolute-media.de (server.absolute-media.de
	[213.239.231.9])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 3485843D48;
	Fri, 20 Jan 2006 07:28:02 +0000 (GMT) (envelope-from NKoch@demig.de)
Received: from localhost (unknown [127.0.0.1])
	by server.absolute-media.de (Postfix) with ESMTP id 2E3ECBCE2C;
	Fri, 20 Jan 2006 08:28:01 +0100 (CET)
Received: from server.absolute-media.de ([127.0.0.1])
	by localhost (server [127.0.0.1]) (amavisd-new, port 10024) with ESMTP
	id 16026-06; Fri, 20 Jan 2006 08:27:55 +0100 (CET)
Received: from firewall.demig (p508391F0.dip0.t-ipconnect.de [80.131.145.240])
	by server.absolute-media.de (Postfix) with ESMTP id 43DC2B92EE;
	Fri, 20 Jan 2006 08:27:55 +0100 (CET)
Received: from ws-ew-3 (ws-ew-3.demig.intra [192.168.1.72])
	by firewall.demig (8.13.5/8.13.4) with SMTP id k0K7OrfO015644;
	Fri, 20 Jan 2006 08:24:56 +0100 (CET) (envelope-from NKoch@demig.de)
From: "Norbert Koch" <NKoch@demig.de>
To: "Kimberly Davis" <kimblydavis@yahoo.com>,
	"John Baldwin" <jhb@freebsd.org>, <freebsd-drivers@freebsd.org>
Date: Fri, 20 Jan 2006 08:24:55 +0100
Message-ID: <000101c61d92$9ca927c0$4801a8c0@ws-ew-3.demig.intra>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook 8.5, Build 4.71.2173.0
In-Reply-To: <20060119213555.28899.qmail@web30003.mail.mud.yahoo.com>
X-MimeOLE: Produced By Microsoft MimeOLE V4.72.2120.0
Importance: Normal
X-Virus-Scanned: by amavisd-new
X-Virus-Scanned: by amavisd-new at absolute-media.de
Cc: 
Subject: RE: Interrupt Handlers and Driver to Driver Communication
X-BeenThere: freebsd-drivers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Writing device drivers for FreeBSD <freebsd-drivers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-drivers>, 
	<mailto:freebsd-drivers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-drivers>
List-Post: <mailto:freebsd-drivers@freebsd.org>
List-Help: <mailto:freebsd-drivers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-drivers>,
	<mailto:freebsd-drivers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 20 Jan 2006 07:28:04 -0000

 
> The results of that test are as follows
>  
> >nm driver1.ko | grep g_status
> 00004239 B g_status
>  
> It doesn't make sense to do that for the client_driver (driver2) 
> since the variable isn't defined there or even externed there. I 
> use the API from driver1 (driver_one_is_complete) to find out the 
> value of g_status.

So, what about 'nm driver[12].ko | grep driver_one_is_complete' ?
Does driver_one_is_complete() do a test-and-reset operation on g_status?
Did you have a look at the assembly output of this function?
What are your compiler (optimization) settings?