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

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Date:	Sat, 6 Dec 2008 15:25:45 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.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 14:24:55 -0800 (PST)
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 
> 
> On Sat, 6 Dec 2008, Rafael J. Wysocki wrote:
> > 
> > However, I'm not quite sure about the freeing and requesting IRQs
> > during suspend and resume.  Many drivers do that, many others
> > don't.  Still, apparently some drivers don't work correctly after
> > resume if this is not done. So, if that should generally be done, I
> > also think that moving it to the core might be a good idea.
> 
> I'd suggest against it.
> 
> A lot of drivers that want to disable (or unregister) interrupts
> almost certainly want to do it simply because they are not ready and
> willing to handle any interrupts after having run their "suspend()"
> function. 

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
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