[PATCH] PCI Hotplug: create pci_remove_bus()

The following patch implements a pci_remove_bus() that can be used by
hotplug drivers for the removal of root buses.  It also defines a
release function that frees the device struct for pci_bus->bridge when a
root bus class device is unregistered.
Signed-off-by: John Rose <johnrose@austin.ibm.com>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/pci/probe.c

@@ -571,6 +571,11 @@ static int pci_cfg_space_size(struct pci_dev *dev)
 	return PCI_CFG_SPACE_SIZE;
 }
 
+static void pci_release_bus_bridge_dev(struct device *dev)
+{
+	kfree(dev);
+}
+
 /*
  * Read the config data for a PCI device, sanity-check it
  * and fill in the dev structure...
@@ -772,6 +777,7 @@ struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, int bus,
 
 	memset(dev, 0, sizeof(*dev));
 	dev->parent = parent;
+	dev->release = pci_release_bus_bridge_dev;
 	sprintf(dev->bus_id, "pci%04x:%02x", pci_domain_nr(b), bus);
 	device_register(dev);
 	b->bridge = get_device(dev);

drivers/pci/remove.c

@@ -59,6 +59,18 @@ int pci_remove_device_safe(struct pci_dev *dev)
 }
 EXPORT_SYMBOL(pci_remove_device_safe);
 
+void pci_remove_bus(struct pci_bus *b)
+{
+	pci_proc_detach_bus(b);
+
+	spin_lock(&pci_bus_lock);
+	list_del(&b->node);
+	spin_unlock(&pci_bus_lock);
+
+	class_device_unregister(&b->class_dev);
+}
+EXPORT_SYMBOL(pci_remove_bus);
+
 /**
  * pci_remove_bus_device - remove a PCI device and any children
  * @dev: the device to remove
@@ -77,13 +89,7 @@ void pci_remove_bus_device(struct pci_dev *dev)
 		struct pci_bus *b = dev->subordinate;
 
 		pci_remove_behind_bridge(dev);
-		pci_proc_detach_bus(b);
-
-		spin_lock(&pci_bus_lock);
-		list_del(&b->node);
-		spin_unlock(&pci_bus_lock);
-
-		class_device_unregister(&b->class_dev);
+		pci_remove_bus(b);
 		dev->subordinate = NULL;
 	}
 

include/linux/pci.h

@@ -712,7 +712,7 @@ struct resource *pci_find_parent_resource(const struct pci_dev *dev, struct reso
 int pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge);
 extern struct pci_dev *pci_dev_get(struct pci_dev *dev);
 extern void pci_dev_put(struct pci_dev *dev);
-
+extern void pci_remove_bus(struct pci_bus *b);
 extern void pci_remove_bus_device(struct pci_dev *dev);
 
 /* Generic PCI functions exported to card drivers */