linux-kernel - Re: [PATCH] pci: enable MSI on 8132

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Message-Id: <20090218111510.b720aacb.akpm@linux-foundation.org>
Date:	Wed, 18 Feb 2009 11:15:10 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	david@...g.hm, matthew@....cx, yinghai@...nel.org,
	jbarnes@...tuousgeek.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, DL-MPTFusionLinux@....com,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci: enable MSI on 8132

On Wed, 18 Feb 2009 18:38:04 +0000
James Bottomley <James.Bottomley@...senPartnership.com> wrote:

> On Wed, 2009-02-18 at 10:04 -0800, Andrew Morton wrote:
> > On Wed, 18 Feb 2009 04:27:28 -0800 (PST) david@...g.hm wrote:
> > 
> > > On Wed, 18 Feb 2009, Matthew Wilcox wrote:
> > > 
> > > > On Tue, Feb 17, 2009 at 08:40:09PM -0800, Yinghai Lu wrote:
> > > >>
> > > >> Impact: workaround BIOS that doesn't enable that bit
> > > >>
> > > >> David reported that LSI sas doesn't work with MSI.
> > > >> it turns out that BIOS doesn't enable HT MSI
> > > >> 8132 does support HT MSI.
> > > >> add quirk to enable it
> > > >>
> > > >> Reported-by: David Lang <david@...g.hm>
> > > >> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> > > >
> > > > Reviewed-by: Matthew Wilcox <willy@...ux.intel.com>
> > > >
> > > > Jesse, I think this should go into Linus' tree sooner rather than later.
> > > 
> > > please forward to -stable as well. this is a regression since the card 
> > > works with older kernels.
> > > 
> > 
> > Which kernel version introduced the regression?
> 
> Technically, it's not a regression.  The MSI problem has always been
> there, it was just exposed when the SAS card switched to using MSI by
> default.  It's fixed by the bridge quirk  ... of course it's unclear how
> many more bridges with problems there are.
> 
> > Do we not need mpt-fix-enable-lsi-sas-to-use-msi-as-default.patch as
> > well, to fix this regression?
> 
> No ... it's a separate issue.  MSI was enabled for fusion SAS in 2.6.26;
> the problem msi patch which the above corrects actually has the effect
> of disabling MSI for fusion and went into 2.6.29-rc2, which isn't a
> kernel that's been tested here.

<scratches head>

So it should be the case that _either_ of
mpt-fix-enable-lsi-sas-to-use-msi-as-default.patch and
pci-enable-msi-on-8132.patch would fix David's machine?

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