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    SubjectRe: ACPI hotplug panic with current git head
    James Bottomley wrote:
    > On Fri, 2009-01-16 at 15:07 +0900, Kenji Kaneshige wrote:
    >>> It looks like acpi_pci_get_bridge_handle() is returning NULL, so this is
    >>> the fix that works for me.
    >>>
    >> I'm sorry for troubling you, and thank you for your patience.
    >>
    >> The patch seems to avoid the kernel panic, but I still don't know
    >> why acpi_pci_get_bridge_handle() returns NULL here. I assumed
    >> it should return non-NULL value here. So I'd like to investigate
    >> it more.
    >
    > Sure, Len and I couldn't work out why it was returning NULL on this box
    > (other than that perhaps it doesn't have an ACPI entry). The two
    > offending busses which trigger this are the two internal ones (which
    > aren't hotplug). The layout of the box is:
    >
    > sparkweed:~# lspci -t
    > -+-[0000:0c]---00.0
    > +-[0000:0a]---00.0
    > +-[0000:08]---00.0
    > +-[0000:06]---00.0
    > +-[0000:04]---00.0
    > +-[0000:02]---00.0
    > +-[0000:01]-+-00.0
    > | +-01.0
    > | +-01.1
    > | \-02.0
    > \-[0000:00]-+-00.0
    > +-01.0
    > +-03.0
    > +-03.1
    > +-03.2
    > +-0f.0
    > +-0f.1
    > \-0f.3
    > sparkweed:~# lspci
    > 00:00.0 Host bridge: IBM Calgary PCI-X Host Bridge (rev 02)
    > 00:01.0 VGA compatible controller: ATI Technologies Inc Radeon RV100 QY
    > [Radeon 7000/VE]
    > 00:03.0 USB Controller: NEC Corporation USB (rev 43)
    > 00:03.1 USB Controller: NEC Corporation USB (rev 43)
    > 00:03.2 USB Controller: NEC Corporation USB 2.0 (rev 04)
    > 00:0f.0 Host bridge: Broadcom CSB6 South Bridge (rev a0)
    > 00:0f.1 IDE interface: Broadcom CSB6 RAID/IDE Controller (rev a0)
    > 00:0f.3 ISA bridge: Broadcom GCLE-2 Host Bridge
    > 01:00.0 Host bridge: IBM Calgary PCI-X Host Bridge (rev 02)
    > 01:01.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5704
    > Gigabit Ethernet (rev 10)
    > 01:01.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5704
    > Gigabit Ethernet (rev 10)
    > 01:02.0 SCSI storage controller: Adaptec AIC-9410W SAS (Razor ASIC
    > non-RAID) (rev 08)
    > 02:00.0 Host bridge: IBM Calgary PCI-X Host Bridge (rev 02)
    > 04:00.0 Host bridge: IBM Calgary PCI-X Host Bridge (rev 02)
    > 06:00.0 Host bridge: IBM Calgary PCI-X Host Bridge (rev 02)
    > 08:00.0 Host bridge: IBM Calgary PCI-X Host Bridge (rev 02)
    > 0a:00.0 Host bridge: IBM Calgary PCI-X Host Bridge (rev 02)
    > 0c:00.0 Host bridge: IBM Calgary PCI-X Host Bridge (rev 02)
    >
    > And when I annotate the problem, the two busses returning NULL are
    > 0000:00 and 0000:01
    >

    Thank you very much for the information. It seems there are
    something special in the data structure of host bridge for
    0000:00 and 0000:01.

    I'm making a debug patch now and will send it to you as soon
    as possible. I'm sorry to trouble you, but could you try it
    later.

    Thanks,
    Kenji Kaneshige




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