linux-kernel - Re: [PATCH 1/3] PCI: Rework default handling of suspend and resume

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Message-Id: <200812062250.43445.rjw@sisk.pl>
Date:	Sat, 6 Dec 2008 22:50:42 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <greg@...ah.com>, Ingo Molnar <mingo@...e.hu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Takashi Iwai <tiwai@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH 1/3] PCI: Rework default handling of suspend and resume

On Saturday, 6 of December 2008, Alan Cox wrote:
> > prefer it to go next.  After it's been merged, I'm going to add the mandatory
> > suspend-resume things (save state and go to a low power state on suspend,
> > restore state on resume) to the new framework in a separete patch.
> > 
> > Is this plan acceptable?
> 
> I have at least two drivers I look after where if you put the device into
> D3 you lost. We survive because on a successful suspend/resume sequence
> the BIOS puts it back coming out of suspend but that means we must not
> put those devices into D3 ourselves ever - including during a suspend
> before we are 100% comitted to the suspend completing or reboot.

We can mark them as devices not to put into D3.  There already is a
mechanism for that in place.

Thanks,
Rafael
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