dom0 kernel fails to recognize DVD drive on piix controller

[Olaf Hering <olaf@aepfle.de>]

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On my Fujitsu Esprimo Mobile M9400 laptop the upstream dom0 kernel does
not find the DVD drive. The DVD drive is found with native kernels and
also with xenlinux based kernels, like 4.1 based openSUSE Leap.

[    6.242286] ata_piix 0000:00:1f.1: version 2.13
[    6.242625] xen: registering gsi 19 triggering 0 polarity 1
[    6.242635] Already setup the GSI :19
[    6.250792] ata_piix: probe of 0000:00:1f.1 failed with error -22

After some investigation it turned out that irq_to_desc() returns
nothing for the piix PCI device, as a result EINVAL is returned.
The callchain is like:
 piix_init_one
  ata_pci_sff_activate_host (legacy_mode case)
   devm_request_threaded_irq
    irq_to_desc

This happens with 4.4, 4.5 and 4.6 based dom0 kernels.

Any idea whats happening here, where to look further?

I'm attaching a collection of logfiles, like dmesg, lspci and the used
debug patch, along with the used .config for the dom0 kernel.

Thanks,

Olaf

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