[Bug 11045] Bug in MPT Fusion 2.6.26-rc7 unbootable

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http://bugzilla.kernel.org/show_bug.cgi?id=11045





------- Comment #12 from anonymous@kernel-bugs.osdl.org  2008-07-09 01:19 -------
Reply-To: sathya.prakash@lsi.com

This may  be a problem due to enabling MSI for SPI controllers. I have posted
another message in the list providing the correction patch which is already in
scsi-misc tree. 
If the problem is gone with changing the module parameter mpt_msi_enable=0 or
by applying the patch http://marc.info/?l=linux-scsi&m=121131228827682&w=4 then
it might be due to MSI enabling.


On Tue, Jul 08, 2008 at 05:57:35PM -0400, James Bottomley wrote:
> On Tue, 2008-07-08 at 14:47 -0700, Andrew Morton wrote:
> > On Tue, 8 Jul 2008 14:56:53 -0600 Bjorn Helgaas <bjorn.helgaas@hp.com> wrote:
> >
> > > On Tuesday 08 July 2008 11:23:33 am James Bottomley wrote:
> > > > On Tue, 2008-07-08 at 10:51 -0600, Bjorn Helgaas wrote:
> > > > > Which ACPI screw up is that?  And what's the usual recipe?
> > > >
> > > > The usual screw up where subtle ACPI breakage from release to release
> > > > causes some IRQs to get misrouted.
> > > >
> > > > Usually you start with noacpi and cycle through the pci routing options
> > >
> > > Don't worry, I wasn't trying to talk you out of an ACPI bug report;
> > > I just wanted to get enough specifics so I could see whether it was
> > > something I could fix.
> > >
> > > > If you actually read this bug report, you'll see there was a message
> > > >
> > > > ACPI: Resource is not an IRQ entry
> > > >
> > > > Just before the fusion IRQ failed to get delivered, so I think it's a
> > > > good indicator that there *are* ACPI problems ...
> > >
> > > These messages also happen with 2.6.25, where the MPT Fusion driver
> > > worked, so Kurk opened a separate bugzilla,
> > >   http://bugzilla.kernel.org/show_bug.cgi?id=11049
> > > for them.
> > >
> > > Yakui Zhao thinks the messages are harmless because they're
> > > related to interrupt link devices that we don't use in IOAPIC mode,
> > > and given that the driver works in 2.6.25, that seems plausible
> > > to me.
> > >
> > > Regardless, the messages are alarming and annoying.  I'd like
> > > to understand them better, but I'll pursue that in the 11049
> > > bugzilla.
> > >
> >
> > Let us not forget the other part of this report:
> >
> > BUG: unable to handle kernel NULL pointer dereference at 0000034c
> > IP: [<f885cc5e>] :mptspi:mptspi_dv_renegotiate_work+0xa/0x9f
> > Oops: 0000 [#1] SMP
> 
> That's fixed in the scsi-rc-fixes tree ... but it's a symptom, not a
> cause.  If essential storage is on this adapter, the system will still
> be unbootable.
> 
> James
> 
> 
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