From owner-freebsd-usb@FreeBSD.ORG  Wed Jan 30 16:10:48 2008
Return-Path: <owner-freebsd-usb@FreeBSD.ORG>
Delivered-To: usb@FREEBSD.ORG
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id C83DC16A419
	for <usb@FREEBSD.ORG>; Wed, 30 Jan 2008 16:10:48 +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 77A7013C45B
	for <usb@FREEBSD.ORG>; Wed, 30 Jan 2008 16:10:48 +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 m0UG99pY084739;
	Wed, 30 Jan 2008 09:09:09 -0700 (MST) (envelope-from imp@bsdimp.com)
Date: Wed, 30 Jan 2008 09:09:53 -0700 (MST)
Message-Id: <20080130.090953.1708805666.imp@bsdimp.com>
To: raj@semihalf.com
From: "M. Warner Losh" <imp@bsdimp.com>
In-Reply-To: <47A095D5.2060801@semihalf.com>
References: <47A095D5.2060801@semihalf.com>
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: usb@FREEBSD.ORG
Subject: Re: USB transfer coherency problems with write-allocate caches
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: Wed, 30 Jan 2008 16:10:48 -0000

In message: <47A095D5.2060801@semihalf.com>
            Rafal Jaworowski <raj@semihalf.com> writes:
: Doing a BUS_DMASYNC_PREREAD in usbd_start_transfer() fixes the problems, see
: this patch:
: 
: http://people.freebsd.org/~raj/patches/misc/usbdi-bus_dma-fix.diff
: 
: I'd like to hear comments from people knowing other architectures if they have
: any comments/objections.

I think that this fix looks good to me...

Warner