linux-kernel - Re: [linux-pm] [GIT PULL] PM updates for 2.6.33

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Message-ID: <1260126276.13057.13.camel@studio>
Date:	Sun, 06 Dec 2009 13:04:36 -0600
From:	Victor Lowther <victor.lowther@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] [GIT PULL] PM updates for 2.6.33

On Sun, 2009-12-06 at 10:23 -0500, Alan Stern wrote:
> On Sat, 5 Dec 2009, Linus Torvalds wrote:
> That's ridiculous.  Having gone to all the trouble of building a device
> tree, one which is presumably still almost entirely correct, why go to
> all the trouble of tearing it down only to rebuild it again?  (Note:
> I'm talking about resume-from-RAM here, not resume-from-hibernation.)

There should be nothing special or privileged at all about the device
tree that gets built at boot time.

Consider the scenario of the laptop user with a docking station.
Adding, removing, and rewriting vast swaths of the device tree across
suspend/resume and hibernate/thaw is very easy to do when you are
plugging a laptop into one or more docking stations.

> Instead what we do is verify that the devices we remember from before
> the suspend are still there, and then asynchronously handle new devices
> which have been plugged in during the meantime.  Doing this involves
> relatively little extra or new code; most of the routines are shared
> with the runtime PM and device reset paths.

Devices can vanish across suspend to RAM just as easily as they can be
added.

> 
> _______________________________________________
> linux-pm mailing list
> linux-pm@...ts.linux-foundation.org
> https://lists.linux-foundation.org/mailman/listinfo/linux-pm

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