PCI: Add pci_bus_replace_busn_res()

It will use replace_resource to put bus's busn_res in the resource tree.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 84a307e27197ff..b1da241a8f0d65 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -835,6 +835,21 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
 	return child;
 }
 
+static void pci_bus_replace_busn_res(struct pci_bus *b,
+					 struct resource *busn_res)
+{
+	struct resource *res = &b->busn_res;
+
+	/* busn_res must be registered already*/
+	if (!busn_res->parent)
+		return;
+
+	replace_resource(busn_res, res);
+
+	dev_printk(KERN_DEBUG, &b->dev, "busn_res: %pR is updated under %pR\n",
+			res, res->parent);
+}
+
 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
 {
 	struct pci_bus *child;