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Subject[patch 2.6.13-rc2] yet another fix for setup-bus.c/x86 merge
There is a slight disagreement between setup-bus.c code and traditional
x86 PCI setup wrt which recourses are invalid vs resources that are
free for further allocations.
Precisely, in the setup-bus.c, if we failed to allocate some resource,
we nullify "start" and "flags" fields, but *not* the "end" one.
But x86 pcibios_enable_resources() does the following check:
if (!r->start && r->end) {
printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", pci_name(dev));
return -EINVAL;
which means that the device owning the offending resource cannot be
enabled.
In particular, this breaks cardbus behind the normal decode p2p bridge -
the cardbus code from setup-bus.c requests rather large IO and MEM windows,
and if it fails, the socket is completely unavailable. Which is wrong, as
the yenta code is capable to allocate smaller windows.

Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>

--- 2.6.13-rc2/drivers/pci/setup-bus.c Thu Jul 7 01:30:58 2005
+++ linux/drivers/pci/setup-bus.c Thu Jul 7 01:32:43 2005
@@ -74,6 +74,7 @@ pbus_assign_resources_sorted(struct pci_
idx = res - &list->dev->resource[0];
if (pci_assign_resource(list->dev, idx)) {
res->start = 0;
+ res->end = 0;
res->flags = 0;
}
tmp = list;
-
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