Subject: Re: Resume only part of device tree?
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Nigel Cunningham <ncunningham@users.sourceforge.net>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
In-Reply-To: <1078344202.3203.22.camel@calvin.wpcb.org.au>
References: <1078344202.3203.22.camel@calvin.wpcb.org.au>
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Date: Thu, 04 Mar 2004 09:40:23 +1100
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On Thu, 2004-03-04 at 07:03, Nigel Cunningham wrote:
> Hi all.
> 
> Is there any existing code in the device model that supports resuming a
> part of the device tree? For Suspend2, I'm wanting to resume storage
> devices (and their parents) part way through resuming, and other drivers
> later.

What is your exact goal ? Not resuming all devices when writing the
state to the swap partition ?

You really need to resume it all at this point. However, the optimisation
that can be done is for some drivers to not put the HW to sleep on a
swsusp transition, only freeze the state. I did something like that in
IDE though that doesn't always work well due our "state" paremeter passed
down to drivers not beeing consistent.

Ben.


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