From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751353AbWFYCn0 (ORCPT ); Sat, 24 Jun 2006 22:43:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751356AbWFYCn0 (ORCPT ); Sat, 24 Jun 2006 22:43:26 -0400 Received: from rwcrmhc15.comcast.net ([216.148.227.155]:23750 "EHLO rwcrmhc15.comcast.net") by vger.kernel.org with ESMTP id S1751353AbWFYCnZ (ORCPT ); Sat, 24 Jun 2006 22:43:25 -0400 Subject: Re: [linux-pm] [PATCH] get USB suspend to work again on 2.6.17-mm1 From: Jim Gettys Reply-To: jg@laptop.org To: David Brownell Cc: Greg KH , Mattia Dongili , Jiri Slaby , linux-pm@osdl.org, linux-kernel@vger.kernel.org, linux-usb-devel@lists.sourceforge.net In-Reply-To: <200606222034.44085.david-b@pacbell.net> References: <20060622202952.GA14135@kroah.com> <200606221624.03182.david-b@pacbell.net> <20060622235112.GA30484@kroah.com> <200606222034.44085.david-b@pacbell.net> Content-Type: text/plain Organization: OLPC Date: Sat, 24 Jun 2006 22:42:57 -0400 Message-Id: <1151203377.15365.389.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.6.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2006-06-22 at 20:34 -0700, David Brownell wrote: > Under what scenario could it possibly be legitimate to suspend a > usb device -- or interface, or anything else -- with its children > remaining active? The ability to guarantee that could _never_ happen > was one of the fundamental motivations for the driver model ... > I'm not sure this directly applies, but.... The Marvell wireless chip we're using this generation in the OLPC machine is interfaced via USB. Not ideal, but there's no other game in town to let us keep the mesh network up while the main machine is STR. We intend to leave the Marvell chip on (it can forward packets in the mesh network, and/or wake up the CPU if there are inbound packets for the machine that matter), and turn off the USB interface it is attached to. Regards, - Jim -- Jim Gettys One Laptop Per Child