[PATCH 10/18] PCI: Add pci_bus_extend/shrink_top()

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extend or shrink bus and parent buses top (subordinate)

extended range is verified safe range, and stop at recorded parent_res.

Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
 drivers/pci/probe.c |   36 ++++++++++++++++++++++++++++++++++++
 1 files changed, 36 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index e09f9b2..c03d3ff 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -648,6 +648,42 @@ static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
+static void __devinit pci_bus_update_top(struct pci_bus *parent,
+		 long size, struct resource *parent_res)
+	struct resource *res;
+	if (!size)
+		return;
+	while (parent) {
+		res = &parent->busn_res;
+		if (res == parent_res)
+			break;
+		res->end += size;
+		parent->subordinate += size;
+		pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS,
+					 parent->subordinate);
+		dev_printk(KERN_DEBUG, &parent->dev,
+				"busn_res: %s %02lx to %pR\n",
+				(size > 0) ? "extended" : "shrunk",
+				abs(size), res);
+		parent = parent->parent;
+	}
+static void __devinit pci_bus_extend_top(struct pci_bus *parent,
+		 long size, struct resource *parent_res)
+	pci_bus_update_top(parent, size, parent_res);
+static void __devinit pci_bus_shrink_top(struct pci_bus *parent,
+		 long size, struct resource *parent_res)
+	pci_bus_update_top(parent, -size, parent_res);
  * If it's a bridge, configure it and scan the bus behind it.
  * For CardBus bridges, we don't scan behind as the devices will

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