From owner-freebsd-usb@FreeBSD.ORG  Mon Jan 10 03:11:43 2005
Return-Path: <owner-freebsd-usb@FreeBSD.ORG>
Delivered-To: freebsd-usb@hub.freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 83AF216A4CE
	for <freebsd-usb@hub.freebsd.org>;
	Mon, 10 Jan 2005 03:11:43 +0000 (GMT)
Received: from harmony.village.org (rover.village.org [168.103.84.182])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 18EEE43D2D
	for <freebsd-usb@hub.freebsd.org>;
	Mon, 10 Jan 2005 03:11:43 +0000 (GMT)	(envelope-from imp@bsdimp.com)
Received: from localhost (warner@rover2.village.org [10.0.0.1])
	by harmony.village.org (8.13.1/8.13.1) with ESMTP id j0A38kSt028052;
	Sun, 9 Jan 2005 20:08:50 -0700 (MST)
	(envelope-from imp@bsdimp.com)
Date: Sun, 09 Jan 2005 20:09:10 -0700 (MST)
Message-Id: <20050109.200910.28786915.imp@bsdimp.com>
To: julian@elischer.org
From: "M. Warner Losh" <imp@bsdimp.com>
In-Reply-To: <41E1C8C5.4070605@elischer.org>
References: <6.1.2.0.2.20050109174427.0802c640@pop3>
	<20050109.125213.02300240.imp@bsdimp.com>
	<41E1C8C5.4070605@elischer.org>
X-Mailer: Mew version 3.3 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@hub.freebsd.org
cc: dinkevich@gmail.com
Subject: Re: stack synchronization
X-BeenThere: freebsd-usb@freebsd.org
X-Mailman-Version: 2.1.1
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: Mon, 10 Jan 2005 03:11:43 -0000

In message: <41E1C8C5.4070605@elischer.org>
            Julian Elischer <julian@elischer.org> writes:
: M. Warner Losh wrote:
: > In message: <6.1.2.0.2.20050109174427.0802c640@pop3>
: >             Boris Dinkevich <dinkevich@gmail.com> writes:
: > : Hello everyone,
: > : 
: > : When going over the usb-host stack, it appears that synchronization is done 
: > : via splusb/x.
: > : But in the 5.3 release, these functions are implemented at stubs.
: > : 
: > : How is the sync done then ?
: > : 
: > : Also, with soft_interrupts, it appears there is no need for spls, am I 
: > : correct ?
: > 
: > Giant locking.
: > 
: > I have patches to move the interrupt outside of giant, but the rest of
: > the stack is still under giant locking.
: 
: it may be worth just adding a single "usb system" lock..

well duh!  However, there's a lot of things that can trivially be done
with giant.  Locking with a usb subsystem lock takes a lot more
effort...

Warner