powerpc: Fix pciconfig_iobase system call on PCI-Express powermac

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X has been failing to start on my quad G5 powermac since commit
1fd0f52583 ("powerpc: Fix domain numbers
in /proc on 64-bit") went in.  The reason is that the change allows X
to see the PCI-PCI bridge above the video card (previously it was
obscured by the fact that there were two "00" directories in
/proc/bus/pci), and the pciconfig_iobase system call on the bridge is
failing because of a hack that we have to return information about the
AGP bus when X asks about bus 0.  This machine doesn't have an AGP bus
(it has PCI Express) and so the pciconfig_iobase call is returning -1,
which ultimately causes X to fail to start.

This fixes it by checking that we have an AGP bridge before
redirecting the pciconfig_iobase call to return information about the
AGP bus.  With this, X starts successfully both on a quad G5 with
PCI Express and on an older dual G5 with AGP.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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Paul Mackerras 2008-12-28 14:12:57 +00:00 • committed by Benjamin Herrenschmidt

parent 1d5bc03a81

commit 16124f10df

1 changed files with 7 additions and 2 deletions

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arch/powerpc/kernel/pci_64.c

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