From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757950AbXKZQ6Q (ORCPT ); Mon, 26 Nov 2007 11:58:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754280AbXKZQ57 (ORCPT ); Mon, 26 Nov 2007 11:57:59 -0500 Received: from mx1.redhat.com ([66.187.233.31]:47999 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754153AbXKZQ56 (ORCPT ); Mon, 26 Nov 2007 11:57:58 -0500 Message-ID: <474AF9D9.8070209@redhat.com> Date: Mon, 26 Nov 2007 11:52:41 -0500 From: Chris Snook User-Agent: Thunderbird 2.0.0.9 (X11/20071115) MIME-Version: 1.0 To: Jay Cliburn CC: greg@kroah.com, chrisw@sous-sol.org, kronos.it@gmail.com, linux-kernel@vger.kernel.org, stable@kernel.org Subject: Re: [2.6.22.y][PATCH] atl1: disable broken 64-bit DMA References: <20071124191518.GA3672@osprey.hogchain.net> In-Reply-To: <20071124191518.GA3672@osprey.hogchain.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Jay Cliburn wrote: > atl1: disable broken 64-bit DMA > > [ Upstream commit: 5f08e46b621a769e52a9545a23ab1d5fb2aec1d4 ] > > The L1 network chip can DMA to 64-bit addresses, but multiple descriptor > rings share a single register for the high 32 bits of their address, so > only a single, aligned, 4 GB physical address range can be used at a time. > As a result, we need to confine the driver to a 32-bit DMA mask, otherwise > we see occasional data corruption errors in systems containing 4 or more > gigabytes of RAM. > > Signed-off-by: Jay Cliburn > Cc: Luca Tettamanti > Cc: Chris Snook Acked-By: Chris Snook