Re: [PATCH] pci: Workaround Stratus broken PCIE hierarchy

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> Bjorn,
> 
> > 
> > Is this problem a regression?  If so, what commit caused it?
> > f07852d6442, which introduced only_one_child()?
> 
> That's a tough question to answer.  AFAICT the broken (HARDWARE
> broken) Stratus systems only enumerated properly by chance.  Did
> they work prior to f07852d6?  From what jparadis told me, yes.  Is
> it a regression? ... depends on how you look at it.

Yes, that is the commit that caused the problem.  

> > Does Windows work on this system?
> 
> I don't know.  jparadis?  Any clue?

Windows works just fine on this system, probably because they 
don't optimize the PCIE scan in this way...

> > Is this something that could be fixed by a firmware upgrade?  If
> > so,
> > is there a Stratus/NEC bug report?
> 
> Hmmm, the idea of a FW upgrade somehow fixing this never occurred to
> me.  jparadis?  Is that possible?

I seriously doubt it, but I can ask the hardware folks at Stratus.
I believe that at least some of this topology is baked in...

> > Is there a Red Hat bugzilla URL you could include?
> 
> Only happens upstream.

Well, to be fair, we actually saw this behavior beginning with 
Fedora 14, but never pursued the matter until now.  I suppose
we could have filed a Fedora bug, but we wanted to root-cause the
problem first.

--jim

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