linux-kernel - Re: [PATCH 0/11] ACPI: Fixes and cleanups related to iomaps management

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Date:	Sun, 23 Jan 2011 21:35:32 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Jeff Chua <jeff.chua.linux@...il.com>, Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
	platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH 0/11] ACPI: Fixes and cleanups related to iomaps management

On Sunday, January 23, 2011, Henrique de Moraes Holschuh wrote:
> On Sat, 22 Jan 2011, Rafael J. Wysocki wrote:
> > > I discovered CONFIG_THINKPAD_ACPI caused suspend-to-disk to hang. I
> > > need the Thinkpad ACPI to control the fan and bluetooth. It looks like
> > > the thinkpad acpi is trying acquire locks while suspending.  Disabling
> > > cmos, light, led and hotkeys makes suspend-to-disk works again.
> > 
> > Well, we should tell the thinkpad_acpi maintainer about that, then (CCed).
> 
> What are the requirements re. mutexes for sleep-to-disk versus sleep-to-ram?

No difference.  Basically, there are two differences between suspend and
hibernation, as far as drivers are concerned:
(1) It's better to use the ->freeze()/->thaw() and ->poweroff()/->restore()
    callbacks for hibernation.
(2) It may be _much_ more difficult to get free memory during hibernation
    (so theoretically attempts to get memory during hibernation are more likely
    to block).

> Did something change in that area that caused the driver to hang?  A pointer
> to the ML threads, documentation, or patchset/git commit with those changes
> would be enough answer, and I will pursue it from there.

I'm not aware of any such changes.

Besides, the problem reported by Jeff seems to be caused by CPU hotplug.

Thanks,
Rafael
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