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PCI: remove transparent bridge sizing

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Remove transparent bridge sizing.

Due to code in pci_read_bridge_bases() [drivers/pci/probe.c] the child
bus of a transparent bridge already has access to the parent bus
resources so transparent bridge sizing appears unnecessary.  The bridge
sizing includes alignment and granularity adjustments that can cause
significantly more memory to be reserved from the parant bus than
required by devices on the child bus and allotted by _CRS.

Signed-off-by: Gary Hade <gary.hade@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Gary Hade 2007-10-03 15:55:51 -07:00 committed by Greg Kroah-Hartman
parent ecb3908046
commit 8fa5913d54
1 changed files with 5 additions and 0 deletions
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5
drivers/pci/setup-bus.c
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@ -472,7 +472,12 @@ void pci_bus_size_bridges(struct pci_bus *bus)
break; break;
case PCI_CLASS_BRIDGE_PCI: case PCI_CLASS_BRIDGE_PCI:
/* don't size subtractive decoding (transparent)
* PCI-to-PCI bridges */
if (bus->self->transparent)
break;
pci_bridge_check_ranges(bus); pci_bridge_check_ranges(bus);
/* fall through */
default: default:
pbus_size_io(bus); pbus_size_io(bus);
/* If the bridge supports prefetchable range, size it /* If the bridge supports prefetchable range, size it