From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264153AbUHJKJU (ORCPT ); Tue, 10 Aug 2004 06:09:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264113AbUHJKJU (ORCPT ); Tue, 10 Aug 2004 06:09:20 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.31.123]:21187 "EHLO atrey.karlin.mff.cuni.cz") by vger.kernel.org with ESMTP id S263893AbUHJKIr (ORCPT ); Tue, 10 Aug 2004 06:08:47 -0400 Date: Tue, 10 Aug 2004 12:08:46 +0200 From: Pavel Machek To: Benjamin Herrenschmidt Cc: Patrick Mochel , Linux Kernel list , David Brownell Subject: Re: [RFC] Fix Device Power Management States Message-ID: <20040810100846.GD9034@atrey.karlin.mff.cuni.cz> References: <20040809113829.GB9793@elf.ucw.cz> <1092098630.14100.73.camel@gaston> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1092098630.14100.73.camel@gaston> User-Agent: Mutt/1.5.6i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > > > Aha, so you are saying these do not need to be done in hardware order? > > > > AFAICT, no. > > As stated in my previous mail, I don't agree here... there are > dependencies that cannot be dealt otherwise. USB was an example > (ieee1394 is another), IDE is one, SCSI, i2c, whatever ... > > Of course, if we consider those "bus" drivers not to have class > and thus not to be stopped and only the "leaf" devices to get stopped, > that may work... I'm not sure we are not missing something there > though... Stopping only leafs is *not* enough as usb host controllers do DMA. Pavel -- Horseback riding is like software... ...vgf orggre jura vgf serr.