linux-kernel - Re: What should PCI core do during suspend-resume? (was: Re: 2.6.29-rc3: tg3 dead after resume)

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Date:	Sat, 31 Jan 2009 17:06:47 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Parag Warudkar <parag.lkml@...il.com>,
	Matt Carlson <mcarlson@...adcom.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: What should PCI core do during suspend-resume? (was: Re:
 2.6.29-rc3: tg3 dead after resume)

On Sun, 1 Feb 2009, Rafael J. Wysocki wrote:
> 
> All this leads to the conclusion that we should put devices into low power
> states with interrupts off and this seems to imply that we'll need to make the
> AML interpreter allow us to run AML with interrupts off.

How many devices actually have the _PS3 method (or whatever it is that we 
end up executing)? We might be able to simply flag it, and say "ok, if we 
have a _PS3 method, we'll have to suspend early, otherwise we can leave it 
for a late suspend".

Definitely not perfect, but perhaps a way to get the safe thing on 99% of 
all cases, and have to live with the horrid ACPI rules on some things.

I thought the _DSW thing is common for setting up wakeup, but _PSx is not. 
But I have not looked at many ACPI tables in my life. I try to active 
avoid it if I at all humanly can.

			Linus
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