Re: [PATCH 0/2] ACPI: return error in acpi_pci_irq_enable when there is no irq

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

On Fri, Sep 13, 2013 at 05:55:40PM -0600, Bjorn Helgaas wrote:
> On Fri, Sep 13, 2013 at 5:43 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > On Friday, September 13, 2013 08:52:18 AM Prarit Bhargava wrote:
> >>
> >> Rafael, is this in your queue?
> >
> > No, it is not, because Bjorn wanted to debug this issue deeper as far as I
> > could understand.
> >
> > Bjorn?
> 
> Yes.  Yinghai pointed out a possible issue ("some USB3 host controller
> does not have intx configured, but still work with MSI?").  I can't
> explain to you right now what that means, but I did look at it enough
> to think that there indeed might be a problem there.
> 
> So I asked [1] for a bugzilla with more info (dmesg, acpidump) so
> somebody could look at it.  Actually, I was hoping Heikki or Prarit
> would look into it and address Yinghai's concern.  Maybe there's no
> problem there, but we should at least look and explain *why* it's not
> a problem.  And I would really like a kernel.org bugzilla with the
> info, in case this change turns out to have unintended consequences
> and we have to debug it again later.

I'll ask Sarah (xHCI maintaner) for help in case she knows something
and create a bug for this if needed.

I don't understand much about PCI, I need to study it a bit. Why would
it be a problem to get the xHCI working with only MSI?

Thanks,

-- 
heikki