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 <[EMAIL PROTECTED]>
--- 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;
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
