linux-kernel - Re: [PATCH 3/3] Sound (HDA Intel): Restore PCI configuration space with interrupts off

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Date:	Thu, 11 Dec 2008 21:27:36 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg KH <greg@...ah.com>, Ingo Molnar <mingo@...e.hu>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH 3/3] Sound (HDA Intel): Restore PCI configuration space with interrupts off

At Thu, 11 Dec 2008 21:03:16 +0100,
Rafael J. Wysocki wrote:
> 
> On Thursday, 11 of December 2008, Takashi Iwai wrote:
> > At Sun, 07 Dec 2008 10:47:56 +0100,
> > I wrote:
> > > 
> > > At Sat, 6 Dec 2008 20:45:35 -0800,
> > > Jesse Barnes wrote:
> > > > 
> > > > On Saturday, December 6, 2008 6:09 am Rafael J. Wysocki wrote:
> > > > > From: Rafael J. Wysocki <rjw@...k.pl>
> > > > > Subject: Sound (HDA Intel): Restore PCI configuration space with interrupts
> > > > > off
> > > > >
> > > > > Move the restoration of the standard PCI configuration registers
> > > > > in the snd_hda_intel driver to a ->resume_early() callback executed
> > > > > with interrupts disabled, since doing that with interrupts enabled
> > > > > may lead to problems in some cases.
> > > > >
> > > > > This patch addresses the regression from 2.6.26 tracked as
> > > > > http://bugzilla.kernel.org/show_bug.cgi?id=12121 .
> > > > 
> > > > Since I only applied 1 and 2 you'll need to send this one through Takashi.
> > > 
> > > OK, I merged it to for-next branch now.
> > > It should appear in the linux-next tree of tomorrow.
> > 
> > There is no build errors at least on linux-next, but I guess the
> > testing about PM has been rarely done on linux-next kernel...
> > 
> > BTW, Rafael, is this particular patch (against hda_intel.c) works in
> > general or dependent on other two patches?
> 
> It should be safe without the other patches too.

OK, but this alone doesn't make much sense without others, right?

I'm asking this because I'm not pretty sure how this should be handled.
Certainly it must be in 2.6.29, but about for 2.6.28...


thanks,

Takashi
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