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From: Alan Stern <stern@rowland.harvard.edu>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Linux-pm mailing list <linux-pm@lists.linux-foundation.org>,
	Kernel development list <linux-kernel@vger.kernel.org>,
	Alexey Starikovskiy <astarikovskiy@suse.de>
Subject: Re: [linux-pm] Fundamental flaw in system suspend, exposed by freezer removal
Date: Mon, 3 Mar 2008 18:12:31 -0500 (EST)	[thread overview]
Message-ID: <Pine.LNX.4.44L0.0803031808150.8280-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <200803032356.35275.rjw@sisk.pl>

On Mon, 3 Mar 2008, Rafael J. Wysocki wrote:

> > > Perhaps it's better to include dpm_sysfs_add() into device_pm_add(), since we
> > > are going the make the return a result anyway?
> > 
> > Yes.
> 
> Okay, I'll prepare a patch for that, on top of the one introducing the
> 'sleeping' field into 'struct dev_pm_info' (posting in a while).

While you're at it, could you add a field to indicate whether 
begin_sleep() has been called?  It would help prevent multiple calls to 
that method when a race does occur, and it could be useful for drivers 
as well.

> The question remains what we're going to do with the drivers without pm_ops
> pointers in the long run (in the short run we will use the legacy callbacks in
> that cases, if defined).

One possibility is to unbind those drivers at the start of a sleep
transition and reprobe them at the end.  Another possibility is to
ignore the lack of PM support and hope it doesn't cause any problems.

Alan Stern


  reply	other threads:[~2008-03-03 23:12 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-25 15:39 Alan Stern
2008-02-25 19:46 ` [linux-pm] " Alan Stern
2008-02-25 22:25   ` Rafael J. Wysocki
2008-02-25 23:37     ` Alan Stern
2008-02-26  0:07       ` Rafael J. Wysocki
2008-02-26 15:49         ` Alan Stern
2008-02-26 23:17           ` Rafael J. Wysocki
2008-02-27 16:03             ` Alan Stern
2008-02-27 19:50               ` Rafael J. Wysocki
2008-02-27 20:15                 ` Alan Stern
2008-02-28 22:49                 ` Alan Stern
2008-02-29  0:01                   ` Rafael J. Wysocki
2008-02-29 14:26                   ` Rafael J. Wysocki
2008-02-29 15:53                     ` Alan Stern
2008-02-29 17:02                       ` Rafael J. Wysocki
2008-02-29 18:42                         ` Alan Stern
2008-02-29 21:57                           ` Rafael J. Wysocki
2008-02-29 22:46                             ` Alan Stern
2008-03-01  0:13                               ` Rafael J. Wysocki
2008-03-01 15:30                                 ` Alan Stern
2008-03-02 13:37                                   ` Rafael J. Wysocki
2008-03-02 16:22                                     ` Alan Stern
2008-03-02 19:11                                       ` Rafael J. Wysocki
2008-03-03  3:54                                         ` Alan Stern
2008-03-03 16:32                                           ` Rafael J. Wysocki
2008-03-03 17:43                                             ` Alan Stern
2008-03-03 20:47                                               ` Rafael J. Wysocki
2008-03-03 22:48                                                 ` Alan Stern
2008-03-03 22:56                                                   ` Rafael J. Wysocki
2008-03-03 23:12                                                     ` Alan Stern [this message]
2008-03-03 23:18                                                       ` Rafael J. Wysocki
2008-02-26  7:13     ` David Brownell
2008-02-26  8:25       ` David Newall
2008-02-26  9:16         ` David Brownell
2008-02-26 13:36           ` David Newall
2008-02-26 15:58             ` Alan Stern
2008-02-25 22:24 ` Rafael J. Wysocki
2008-02-27 20:36 ` Benjamin Herrenschmidt

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