linux-kernel - Re: [PATCH] x86: fix iommu=nodac parameter handling

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Message-Id: <20091105134306W.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 5 Nov 2009 13:44:45 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mingo@...e.hu
Cc:	tj@...nel.org, joerg.roedel@....com, jbarnes@...tuousgeek.org,
	dwmw2@...radead.org, fujita.tomonori@....ntt.co.jp, x86@...nel.org,
	tglx@...utronix.de, hpa@...or.com, athena@...w.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: fix iommu=nodac parameter handling

On Wed, 4 Nov 2009 13:28:27 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Tejun Heo <tj@...nel.org> wrote:
> 
> > nodac should forbid dac instead of enabling it.  Fix it.
> > 
> > Signed-off-by: Tejun Heo <tj@...nel.org>
> > Cc: Matteo Frigo <athena@...w.org>
> > Cc: stable@...nel.org
> > ---
> > This was posted several months ago in a two patch series.  The second
> > one was rejected by Alan and with that the first one got lost too
> > although it's an apparent bug fix.  Matteo hit this bug recently and
> > reminded me about this patch.  So, regenerated and reposting.
> > 
> > Thanks.
> > 
> >  arch/x86/kernel/pci-dma.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
> > index d20009b..8cf3996 100644
> > --- a/arch/x86/kernel/pci-dma.c
> > +++ b/arch/x86/kernel/pci-dma.c
> > @@ -216,7 +216,7 @@ static __init int iommu_setup(char *p)
> >  		if (!strncmp(p, "allowdac", 8))
> >  			forbid_dac = 0;
> >  		if (!strncmp(p, "nodac", 5))
> > -			forbid_dac = -1;
> > +			forbid_dac = 1;
> >  		if (!strncmp(p, "usedac", 6)) {
> >  			forbid_dac = -1;
> >  			return 1;
> 
> (Cc:-ed more interested parties.)

Looks fine to me.
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