On Wed, 2013-11-27 at 02:02 +0100, Rafael J. Wysocki wrote: > On Tuesday, November 26, 2013 05:33:28 PM Toshi Kani wrote: > > On Wed, 2013-11-27 at 01:27 +0100, Rafael J. Wysocki wrote: > > > On Tuesday, November 26, 2013 05:00:42 PM Toshi Kani wrote: > > > > On Mon, 2013-11-25 at 01:09 +0100, Rafael J. Wysocki wrote: > > > > > Hi, > > > > > > > > > > The following series of four patches (on top of current linux-pm.git/bleeding-edge) > > > > > rework child device lookup in drivers/acpi/glue.c and related things: > > > > > > > > > > [1/4] ACPI / bind: Simplify child device lookup > > > > > [2/4] PCI/ ACPI: Use acpi_find_child_device() for child device lookup > > > > > [3/4] ACPI / bind: Redefine acpi_get_child() > > > > > [4/4] ACPI / bind: Redefine acpi_preset_companion() > > > > > > > > This patchset caused the attached panic during boot on a system. > > > > acpi_pci_find_device() called acpi_find_child_device() with > > > > ACPI_COMPANION(dev->parent) being a NULL pointer when scanning bus 0xf. > > > > > > > > This bus 0xf seems to be a chipset internal bus, which is not intended > > > > for the OS to use. Therefore, ACPI does not list its PCI bridge device. > > > > > > > > # lspci -tv > > > > : > > > > +-[0000:0f]-+-08.0 Intel Corporation Ivytown QPI Link 0 > > > > | +-08.2 Intel Corporation Ivytown QPI Link 0 > > > > : > > > > > > > > However, pcibios_fixup_peer_bridges(), called from pci_subsys_init(), > > > > finds this bus as it scans all the buses from 0 to pcibios_last_bus. > > > > Hence, this dev->parent does not have an associated ACPI device object. > > > > > > Thanks for the report! > > > > > > I've dropped the patches from bleeding-edge for now. > > > > > > Does "[1/4] ACPI / bind: Simplify child device lookup" alone work on that > > > system? > > > > Yes, the system boots fine with 1/4 alone. > > Thanks! > > Can you please check if the following modified [2/4] also works on top of it? Yes, it works fine. Thanks for the quick fix! -Toshi -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
