On Sat, Sep 10, 2016 at 11:03:29PM +0800, Rui Wang wrote:
> From b37d806c78e5eea70dbb890c1e3dbb8b7e5038e6 Mon Sep 17 00:00:00 2001
> From: Rui Wang <rui.y.wang@xxxxxxxxx>
> Date: Sat, 10 Sep 2016 10:56:34 -0400
> Subject: [PATCH] x86/ioapic: Ignore root bridges without a companion ACPI device
>
> Some PCI root bridges don't have a corresponding ACPI device.
Please say here that this is can be the case on some old platforms. Mine
is a couple of years old dell workstation box.
> Don't call acpi_ioapic_add() on these bridges because they can't
> support ioapic hotplug.
Right, exactly.
> Signed-off-by: Rui Wang <rui.y.wang@xxxxxxxxx>
> ---
> drivers/pci/setup-bus.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index ec538d3..2b05ac6 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -1852,10 +1852,15 @@ dump:
> void __init pci_assign_unassigned_resources(void)
> {
> struct pci_bus *root_bus;
> + acpi_handle root_handle;
>
> list_for_each_entry(root_bus, &pci_root_buses, node) {
> pci_assign_unassigned_root_bus_resources(root_bus);
> - acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
> + root_handle = ACPI_HANDLE(root_bus->bridge);
> +
> + /* make sure the root bridge has a companion ACPI device */
> + if (root_handle)
> + acpi_ioapic_add(root_handle);
Just do:
if (ACPI_HANDLE(root_bus->bridge))
acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
no need for the local variable - gcc is smart enough to fetch it only
once :)
Anyway, I'll run it later to verify.
Thanks.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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