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PCI: clear bridge resource range if BIOS assigned bad one

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Yannick found that video does not work with 2.6.34.  The cause of this
bug was that the BIOS had assigned the wrong range to the PCI bridge
above the video device.  Before 2.6.34 the kernel would have shrunk
the size of the bridge window, but since
  d65245c PCI: don't shrink bridge resources
the kernel will avoid shrinking BIOS ranges.

So zero out the old range if we fail to claim it at boot time; this will
cause us to allocate a new range at startup, restoring the 2.6.34
behavior.

Fixes regression https://bugzilla.kernel.org/show_bug.cgi?id=16009.

Reported-by: Yannick <[email protected]>
Acked-by: Bjorn Helgaas <[email protected]>
Signed-off-by: Yinghai Lu <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>
This commit is contained in:
Yinghai Lu 2010-06-03 13:43:03 -07:00 • committed by Jesse Barnes
commit 837c4ef13c
4 changed files with 5 additions and 0 deletions
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1
arch/mn10300/unit-asb2305/pci-asb2305.c
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@ -117,6 +117,7 @@ static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
* Invalidate the resource to prevent
* child resource allocations in this
* range. */
r->start = r->end = 0;
r->flags = 0;
}
}