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

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Message-ID: <alpine.LFD.2.00.0812062157590.3425@nehalem.linux-foundation.org>
Date:	Sat, 6 Dec 2008 22:00:59 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Arjan van de Ven <arjan@...radead.org>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	Takashi Iwai <tiwai@...e.de>, Greg KH <greg@...ah.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [linux-pm] [PATCH 1/3] PCI: Rework default handling of suspend
 and resume

On Sat, 6 Dec 2008, Arjan van de Ven wrote:
> 
> the problem is that the system bios can have reassigned interrupts
> after resume, and afaik we need to re-evaluate the ACPI methods to
> get the new mapping.
> So we need to unregister + re-register to make that happen

Can you give actual examples of real life situations?

Because quite frankly, it sounds less and less likely for any relevant 
hardware. It's a non-issue for MSI, for example. And it's a non-issue for 
any sane interrupt source I can think of.

In other words, I've heard that claim before - and I just don't believe 
it. I've never heard a realistic explanation of why it would happen for a 
normal PCI driver. And I still claim that it's a very odd and special case 
if it does.

And btw, I'm talking suspend, not hibernate. 

			Linus
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