From: Oliver Neukum <oliver@neukum.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
linux-pm@lists.linux-foundation.org,
Alexey Starikovskiy <astarikovskiy@suse.de>,
Johannes Berg <johannes@sipsolutions.net>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [linux-pm] [RFC][PATCH] PM: Introduce new top level suspend and hibernation callbacks (rev. 2)
Date: Tue, 25 Mar 2008 15:24:33 +0100 [thread overview]
Message-ID: <200803251524.34147.oliver@neukum.org> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0803251011110.4838-100000@iolanthe.rowland.org>
Am Dienstag, 25. März 2008 15:19:45 schrieb Alan Stern:
> On Tue, 25 Mar 2008, Oliver Neukum wrote:
>
> > Am Dienstag, 25. März 2008 14:06:15 schrieb Rafael J. Wysocki:
> > > On Tuesday, 25 of March 2008, Oliver Neukum wrote:
> >
> > > > A device that cannot wake up is unusable. Shouldn't the pm core disconnect()
> > > > such a device?
>
> It's not safe for the PM core to do such things unilaterally. The
> decision to unregister a device should be made by the driver or the
> subsystem.
Why? You can trigger it from user space via sysfs and in many cases
suspending to disk will disconnect all devices on a bus, so I'd say a
failure to resume is just a limited subcase of a device vanishing during
sleep.
Regards
Oliver
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WARNING: multiple messages have this Message-ID (diff)
From: Oliver Neukum <oliver@neukum.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
linux-pm@lists.linux-foundation.org,
Alexey Starikovskiy <astarikovskiy@suse.de>,
Johannes Berg <johannes@sipsolutions.net>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [linux-pm] [RFC][PATCH] PM: Introduce new top level suspend and hibernation callbacks (rev. 2)
Date: Tue, 25 Mar 2008 15:24:33 +0100 [thread overview]
Message-ID: <200803251524.34147.oliver@neukum.org> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0803251011110.4838-100000@iolanthe.rowland.org>
Am Dienstag, 25. März 2008 15:19:45 schrieb Alan Stern:
> On Tue, 25 Mar 2008, Oliver Neukum wrote:
>
> > Am Dienstag, 25. März 2008 14:06:15 schrieb Rafael J. Wysocki:
> > > On Tuesday, 25 of March 2008, Oliver Neukum wrote:
> >
> > > > A device that cannot wake up is unusable. Shouldn't the pm core disconnect()
> > > > such a device?
>
> It's not safe for the PM core to do such things unilaterally. The
> decision to unregister a device should be made by the driver or the
> subsystem.
Why? You can trigger it from user space via sysfs and in many cases
suspending to disk will disconnect all devices on a bus, so I'd say a
failure to resume is just a limited subcase of a device vanishing during
sleep.
Regards
Oliver
next prev parent reply other threads:[~2008-03-25 14:24 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-21 0:01 [RFC][PATCH] PM: Introduce new top level suspend and hibernation callbacks (rev. 2) Rafael J. Wysocki
2008-03-21 0:01 ` Rafael J. Wysocki
2008-03-21 0:21 ` Johannes Berg
2008-03-21 0:21 ` [linux-pm] " Johannes Berg
2008-03-21 0:26 ` Rafael J. Wysocki
2008-03-21 0:26 ` [linux-pm] " Rafael J. Wysocki
2008-03-25 9:49 ` Oliver Neukum
2008-03-25 9:49 ` [linux-pm] " Oliver Neukum
2008-03-25 13:06 ` Rafael J. Wysocki
2008-03-25 13:06 ` [linux-pm] " Rafael J. Wysocki
2008-03-25 13:15 ` Oliver Neukum
2008-03-25 13:15 ` [linux-pm] " Oliver Neukum
2008-03-25 13:15 ` Oliver Neukum
2008-03-25 14:19 ` Alan Stern
2008-03-25 14:19 ` Alan Stern
2008-03-25 14:24 ` Oliver Neukum
2008-03-25 14:24 ` Oliver Neukum [this message]
2008-03-25 14:24 ` [linux-pm] " Oliver Neukum
2008-03-25 14:33 ` Alan Stern
2008-03-25 14:33 ` [linux-pm] " Alan Stern
2008-03-25 14:33 ` Alan Stern
2008-03-25 19:48 ` Oliver Neukum
2008-03-25 19:48 ` [linux-pm] " Oliver Neukum
2008-03-25 19:48 ` Oliver Neukum
2008-03-25 20:41 ` Rafael J. Wysocki
2008-03-25 20:41 ` [linux-pm] " Rafael J. Wysocki
2008-03-25 20:41 ` Rafael J. Wysocki
2008-03-25 20:49 ` Oliver Neukum
2008-03-25 20:49 ` [linux-pm] " Oliver Neukum
2008-03-25 20:49 ` Oliver Neukum
2008-03-25 20:56 ` Rafael J. Wysocki
2008-03-25 20:56 ` Rafael J. Wysocki
2008-03-26 14:10 ` Alan Stern
2008-03-26 14:10 ` [linux-pm] " Alan Stern
2008-03-26 14:10 ` Alan Stern
2008-03-26 14:24 ` Oliver Neukum
2008-03-26 14:24 ` [linux-pm] " Oliver Neukum
2008-03-26 14:24 ` Oliver Neukum
2008-03-26 14:40 ` Alan Stern
2008-03-26 14:40 ` [linux-pm] " Alan Stern
2008-03-26 14:40 ` Alan Stern
2008-03-26 15:42 ` Oliver Neukum
2008-03-26 15:42 ` Oliver Neukum
2008-03-26 16:36 ` Alan Stern
2008-03-26 16:36 ` [linux-pm] " Alan Stern
2008-03-26 16:36 ` Alan Stern
2008-03-26 20:46 ` Rafael J. Wysocki
2008-03-27 2:48 ` Alan Stern
2008-03-27 2:48 ` Alan Stern
2008-03-27 2:48 ` Alan Stern
2008-03-26 20:46 ` Rafael J. Wysocki
2008-03-26 15:42 ` Oliver Neukum
2008-03-25 20:56 ` Rafael J. Wysocki
2008-03-25 14:19 ` Alan Stern
2008-03-21 1:21 ` Alan Stern
2008-03-21 2:14 ` Rafael J. Wysocki
2008-03-21 2:14 ` Rafael J. Wysocki
2008-03-21 2:53 ` Alan Stern
2008-03-22 22:17 ` Rafael J. Wysocki
2008-03-22 22:17 ` Rafael J. Wysocki
2008-03-22 23:28 ` Alan Stern
2008-03-22 23:28 ` Alan Stern
2008-03-22 23:44 ` Rafael J. Wysocki
2008-03-23 2:07 ` Alan Stern
2008-03-23 18:41 ` Rafael J. Wysocki
2008-03-23 18:41 ` Rafael J. Wysocki
2008-03-23 2:07 ` Alan Stern
2008-03-22 23:44 ` Rafael J. Wysocki
2008-03-21 2:53 ` Alan Stern
2008-03-21 1:21 ` Alan Stern
2008-03-21 8:15 ` Sam Ravnborg
2008-03-23 21:16 ` Rafael J. Wysocki
2008-03-23 21:16 ` Rafael J. Wysocki
2008-03-21 8:15 ` Sam Ravnborg
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