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SubjectRe: [PATCH] PCI hotplug changes for 2.5.63
From
Date
ChangeSet 1.1022.1.8, 2003/02/24 16:28:58-08:00, rmk@arm.linux.org.uk

[PATCH] PCI: Make hot unplugging of PCI buses work

Here's the updated patch:

- Scott spotted a leak my handling of procfs wrt buses.
- I've also killed pci_remove_device() entirely - it is now inlined.
- After one of Alan's mails, I decided that pci_remove_behind_bridge()
is a much better name than pci_remove_all_bus_devices()


diff -Nru a/drivers/pci/hotplug.c b/drivers/pci/hotplug.c
--- a/drivers/pci/hotplug.c Mon Feb 24 17:15:33 2003
+++ b/drivers/pci/hotplug.c Mon Feb 24 17:15:33 2003
@@ -10,6 +10,7 @@
#define DBG(x...)
#endif

+static void pci_free_resources(struct pci_dev *dev);

#ifdef CONFIG_HOTPLUG
int pci_hotplug (struct device *dev, char **envp, int num_envp,
@@ -185,7 +186,13 @@
{
if (pci_dev_driver(dev))
return -EBUSY;
- pci_remove_device(dev);
+ device_unregister(&dev->dev);
+ list_del(&dev->bus_list);
+ list_del(&dev->global_list);
+ pci_free_resources(dev);
+#ifdef CONFIG_PROC_FS
+ pci_proc_detach_device(dev);
+#endif
return 0;
}
EXPORT_SYMBOL(pci_remove_device_safe);
@@ -233,15 +240,33 @@
}

/**
- * pci_remove_device - remove a pci device
+ * pci_remove_bus_device - remove a PCI device and any children
* @dev: the device to remove
*
- * Delete the device structure from the device lists,
- * remove the /proc entry, and notify userspace (/sbin/hotplug).
+ * Remove a PCI device from the device lists, informing the drivers
+ * that the device has been removed. We also remove any subordinate
+ * buses and children in a depth-first manner.
+ *
+ * For each device we remove, delete the device structure from the
+ * device lists, remove the /proc entry, and notify userspace
+ * (/sbin/hotplug).
*/
-void
-pci_remove_device(struct pci_dev *dev)
+void pci_remove_bus_device(struct pci_dev *dev)
{
+ if (dev->subordinate) {
+ struct pci_bus *b = dev->subordinate;
+
+ pci_remove_behind_bridge(dev);
+
+#ifdef CONFIG_PROC_FS
+ pci_proc_detach_bus(b);
+#endif
+
+ list_del(&b->node);
+ kfree(b);
+ dev->subordinate = NULL;
+ }
+
device_unregister(&dev->dev);
list_del(&dev->bus_list);
list_del(&dev->global_list);
@@ -249,9 +274,33 @@
#ifdef CONFIG_PROC_FS
pci_proc_detach_device(dev);
#endif
+
+ kfree(dev);
+}
+
+/**
+ * pci_remove_behind_bridge - remove all devices behind a PCI bridge
+ * @dev: PCI bridge device
+ *
+ * Remove all devices on the bus, except for the parent bridge.
+ * This also removes any child buses, and any devices they may
+ * contain in a depth-first manner.
+ */
+void pci_remove_behind_bridge(struct pci_dev *dev)
+{
+ struct list_head *l, *n;
+
+ if (dev->subordinate) {
+ list_for_each_safe(l, n, &dev->subordinate->devices) {
+ struct pci_dev *dev = pci_dev_b(l);
+
+ pci_remove_bus_device(dev);
+ }
+ }
}

#ifdef CONFIG_HOTPLUG
EXPORT_SYMBOL(pci_insert_device);
-EXPORT_SYMBOL(pci_remove_device);
+EXPORT_SYMBOL(pci_remove_bus_device);
+EXPORT_SYMBOL(pci_remove_behind_bridge);
#endif
diff -Nru a/include/linux/pci.h b/include/linux/pci.h
--- a/include/linux/pci.h Mon Feb 24 17:15:33 2003
+++ b/include/linux/pci.h Mon Feb 24 17:15:33 2003
@@ -645,7 +645,8 @@
int pci_register_driver(struct pci_driver *);
void pci_unregister_driver(struct pci_driver *);
void pci_insert_device(struct pci_dev *, struct pci_bus *);
-void pci_remove_device(struct pci_dev *);
+void pci_remove_bus_device(struct pci_dev *);
+void pci_remove_behind_bridge(struct pci_dev *);
struct pci_driver *pci_dev_driver(const struct pci_dev *);
const struct pci_device_id *pci_match_device(const struct pci_device_id *ids, const struct pci_dev *dev);
unsigned int pci_do_scan_bus(struct pci_bus *bus);
-
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