From owner-freebsd-usb@FreeBSD.ORG  Mon Jun 29 11:49:47 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 594EC106566C
	for <freebsd-usb@FreeBSD.org>; Mon, 29 Jun 2009 11:49:47 +0000 (UTC)
	(envelope-from sebastian.huber@embedded-brains.de)
Received: from mail.embedded-brains.de
	(host-82-135-62-35.customer.m-online.net [82.135.62.35])
	by mx1.freebsd.org (Postfix) with ESMTP id 097E18FC0A
	for <freebsd-usb@FreeBSD.org>; Mon, 29 Jun 2009 11:49:47 +0000 (UTC)
	(envelope-from sebastian.huber@embedded-brains.de)
Received: by mail.embedded-brains.de (Postfix, from userid 65534)
	id 2F8BA6F8241; Mon, 29 Jun 2009 13:29:52 +0200 (CEST)
X-Spam-Checker-Version: SpamAssassin 3.2.3 (2007-08-08) on fidibus.eb.z
X-Spam-Level: 
X-Spam-Status: No, score=-3.4 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00
	autolearn=ham version=3.2.3
Received: from [192.168.96.31] (eb0011.eb.z [192.168.96.31])
	by mail.embedded-brains.de (Postfix) with ESMTP id 7B0E16F823F
	for <freebsd-usb@FreeBSD.org>; Mon, 29 Jun 2009 13:29:49 +0200 (CEST)
Message-ID: <4A48A5AD.9040508@embedded-brains.de>
Date: Mon, 29 Jun 2009 13:29:49 +0200
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
User-Agent: Thunderbird 2.0.0.19 (X11/20081227)
MIME-Version: 1.0
To: freebsd-usb@FreeBSD.org
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
Cc: 
Subject: Potential problem with USB_THREAD_SUSPEND()?
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: Mon, 29 Jun 2009 11:49:47 -0000

Hi,

USB_THREAD_SUSPEND(p) is defined as {kproc|kthread}_suspend(p, 0).  This means
that it will wait until the corresponding thread recognizes its suspend request
and suspends itself.  It seems that {kproc|kthread}_suspend_check() will be
used nowhere in the USB system.  Thus the USB_THREAD_SUSPEND() will block
forever in most cases? It is only used in usb_proc_drain() during cold boot.

Have a nice day!

-- 
Sebastian Huber, Embedded Brains GmbH

Address : Obere Lagerstr. 30, D-82178 Puchheim, Germany
Phone   : +49 89 18 90 80 79-6
Fax     : +49 89 18 90 80 79-9
E-Mail  : sebastian.huber@embedded-brains.de
PGP     : Public key available on request

Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.