Re: ACPI hotplug panic with current git head

[James Bottomley <James.Bottomley@HansenPartnership.com>]

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

James