linux-kernel - Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

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Message-ID: <20071217002827.GG5692@elf.ucw.cz>
Date:	Mon, 17 Dec 2007 01:28:27 +0100
From:	Pavel Machek <pavel@....cz>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Ingo Molnar <mingo@...e.hu>, unlisted-recipients: no@...is.elte.hu,
	To-header@...is.elte.hu, on@...is.elte.hu, "input <"@elvis.elte.hu,
	; Rene Herman <rene.herman@...access.nl>,
	Paul Rolland <rol@...917.net>,
	"H. Peter Anvin" <hpa@...or.com>, Krzysztof Halasa <khc@...waw.pl>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, rol@...be.net
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64
	with MCP51 laptops

On Mon 2007-12-17 00:03:01, Alan Cox wrote:
> On Sun, 16 Dec 2007 22:26:33 +0100
> Pavel Machek <pavel@....cz> wrote:
> 
> > On Fri 2007-12-14 15:33:28, Ingo Molnar wrote:
> > > 
> > > * Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> > > 
> > > > There is another reason we can't just do a dumb changeover - two 
> > > > actually
> > > > 
> > > > #1: Some drivers are using inb_p/outb_p in PCI cases which are going 
> > > > #to cause PCI posting changes. Most are probably just wrong in the 
> > > > #first place but they need hand checking
> > > 
> > > hm, any intelligent way to force PCI posting? I guess not.
> > > 
> > > here's a list of candidate drivers (match the out*_p() pattern and do 
> > > pci)
> > > 
> > > ./char/epca.c 
> > > ./char/sonypi.c
> > > ./scsi/megaraid.c
> > > ./ide/pci/serverworks.c
> > > ./ide/pci/cmd640.c
> > > ./input/mouse/pc110pad.c
> 
> You are missing some watchdogs at least ?

I snipped them, I only wanted to comment that pc110pad.c looks like
legitimate use of outb_p().
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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