Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934531AbZFOVJR (ORCPT ); Mon, 15 Jun 2009 17:09:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S934487AbZFOVI7 (ORCPT ); Mon, 15 Jun 2009 17:08:59 -0400 Received: from iolanthe.rowland.org ([192.131.102.54]:54296 "HELO iolanthe.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S934479AbZFOVI4 (ORCPT ); Mon, 15 Jun 2009 17:08:56 -0400 Date: Mon, 15 Jun 2009 17:08:56 -0400 (EDT) From: Alan Stern X-X-Sender: stern@iolanthe.rowland.org To: "Rafael J. Wysocki" cc: Oliver Neukum , Magnus Damm , , ACPI Devel Maling List , Ingo Molnar , LKML , Greg KH Subject: Re: [patch update] PM: Introduce core framework for run-time PM of I/O devices In-Reply-To: <200906150057.32424.rjw@sisk.pl> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1905 Lines: 44 On Mon, 15 Jun 2009, Rafael J. Wysocki wrote: > On Sunday 14 June 2009, Rafael J. Wysocki wrote: > > On Sunday 14 June 2009, Rafael J. Wysocki wrote: > > > Hi, > > > > > > Below is the current version of my "run-time PM for I/O devices" patch. > > > > > > I've done my best to address the comments received during the recent > > > discussions, but at the same time I've tried to make the patch only contain > > > the most essential things. For this reason, for example, the sysfs interface > > > is not there and it's going to be added in a separate patch. > > > > > > Please let me know if you want me to change anything in this patch or to add > > > anything new to it. [Magnus, I remember you wanted something like > > > ->runtime_wakeup() along with ->runtime_idle(), but I'm not sure it's really > > > necessary. Please let me know if you have any particular usage scenario for > > > it.] > > Appended is an update of the patch addressing the today's comments from Magnus. This is really looking very good. I'll do a more detailed review later. (In particular, I have not checked the details of the rather intricate state machine transitions.) For now, a couple of things struck my eye: Shouldn't the calls to complete() really be complete_all()? There might be more than one thread waiting for a suspend or resume callback to finish. Since pm_runtime_resume() takes care of powering up the parent, there's no need for pm_request_resume() to worry about it also. The documentation should mention that the runtime_suspend method is supposed to enable remote wakeup if it as available and if device_may_wakeup(dev) is true. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/