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. > --- > drivers/pci/pci-acpi.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c > index a8da543b3814..4708eb9df71b 100644 > --- a/drivers/pci/pci-acpi.c > +++ b/drivers/pci/pci-acpi.c > @@ -624,7 +624,7 @@ void acpi_pci_add_bus(struct pci_bus *bus) > union acpi_object *obj; > struct pci_host_bridge *bridge; > > - if (acpi_pci_disabled || !bus->bridge) > + if (acpi_pci_disabled || !bus->bridge || !ACPI_HANDLE(bus->bridge)) > return; > > acpi_pci_slot_enumerate(bus); > -- > 2.13.5 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html
