linux-kernel - Re: [RFC][PATCH] PM: Introduce new top level suspend and hibernation callbacks (rev. 6)

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Message-Id: <1207038460.10388.214.camel@pasglop>
Date:	Tue, 01 Apr 2008 19:27:40 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Nigel Cunningham <ncunningham@...a.org.au>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg KH <greg@...ah.com>, Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	David Brownell <david-b@...bell.net>,
	Pavel Machek <pavel@....cz>, Oliver Neukum <oliver@...kum.org>
Subject: Re: [RFC][PATCH] PM: Introduce new top level suspend and
	hibernation callbacks (rev. 6)


On Tue, 2008-04-01 at 19:15 +1100, Nigel Cunningham wrote:
> > + *   However, drivers may NOT assume anything about the availability of the
> > + *   user space at that time and it is not correct to request firmware from
> > + *   within @prepare() (it's too late to do that).
> 
> That doesn't sound good. It would be good to be able to get drivers to
> request firmware early in the process.

Agreed. Prepare() should still allow request_firmware and full userspace
communication / helper usage.

> > + * @complete: Undo the changes made by @prepare().  This method is executed for
> > + *   all kinds of resume transitions, following one of the resume callbacks:
> > + *   @resume(), @thaw(), @restore().  Also called if the state transition
> > + *   fails before the driver's suspend callback (@suspend(), @freeze(),
> > + *   @poweroff()) can be executed (e.g. if the suspend callback fails for one
> > + *   of the other devices that the PM core has unsucessfully attempted to

Ben.


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