On Tuesday, September 26, 2017 10:25:08 PM CEST Bjorn Helgaas wrote: > On Thu, Sep 14, 2017 at 04:50:14PM +0200, Vitaly Kuznetsov wrote: > > Hyper-V instances support PCI pass-through which is implemented through > > PV pci-hyperv driver. When a device is passed through a new root PCI bus > > is created in the guest. The bus sits on top of VMBus and has no > > associated information in ACPI. acpi_pci_add_bus() in this case proceeds > > all the way to acpi_evaluate_dsm() with reports > > > > ACPI: \: failed to evaluate _DSM (0x1001) > > > > While acpi_pci_slot_enumerate() and acpiphp_enumerate_slots() are protected > > against ACPI_HANDLE() being NULL and do nothing acpi_evaluate_dsm() is not > > and gives us the error. It seems the correct fix is to not do anything in > > acpi_pci_add_bus() in such cases. > > > > Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx> > > Applied to pci/acpi for v4.15, thanks! > > Rafael, let me know if you have any objections or if you'd rather take > it yourself. No objections, all is fine. Thanks, Rafael
