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authorYinghai Lu <yinghai.lu@oracle.com>2010-06-03 13:43:03 -0700
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-06-11 13:24:51 -0700
commit837c4ef13c44296bb763a0ca0e84a076592474cf (patch)
treec075b7e0b5218c19700e730db72f1119d65fc54f /arch/microblaze/pci
parenta7ef7d1f5e898984c479e8c41ca702141bbadc78 (diff)
downloadvexpress-lsk-837c4ef13c44296bb763a0ca0e84a076592474cf.tar.gz
PCI: clear bridge resource range if BIOS assigned bad one
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 <yannick.roehlly@free.fr> Acked-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'arch/microblaze/pci')
-rw-r--r--arch/microblaze/pci/pci-common.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c
index 9cb782b8e03..23be25fec4d 100644
--- a/arch/microblaze/pci/pci-common.c
+++ b/arch/microblaze/pci/pci-common.c
@@ -1277,6 +1277,7 @@ void pcibios_allocate_bus_resources(struct pci_bus *bus)
printk(KERN_WARNING "PCI: Cannot allocate resource region "
"%d of PCI bridge %d, will remap\n", i, bus->number);
clear_resource:
+ res->start = res->end = 0;
res->flags = 0;
}