[PATCH] PCI Hotplug: fix core problem with kobject lifespans.

Added needed release function, now all pci hotplug drivers need to implement
it...

drivers/pci/hotplug/pci_hotplug.h

@@ -51,6 +51,8 @@ struct hotplug_slot_attribute {
 	ssize_t (*show)(struct hotplug_slot *, char *);
 	ssize_t (*store)(struct hotplug_slot *, const char *, size_t);
 };
+#define to_hotplug_attr(n) container_of(n, struct hotplug_slot_attribute, attr);
+
 /**
  * struct hotplug_slot_ops -the callbacks that the hotplug pci core can use
  * @owner: The module owner of this structure
@@ -130,12 +132,14 @@ struct hotplug_slot {
 	char				*name;
 	struct hotplug_slot_ops		*ops;
 	struct hotplug_slot_info	*info;
+	void (*release) (struct hotplug_slot *slot);
 	void				*private;
 
 	/* Variables below this are for use only by the hotplug pci core. */
 	struct list_head		slot_list;
 	struct kobject			kobj;
 };
+#define to_hotplug_slot(n) container_of(n, struct hotplug_slot, kobj)
 
 extern int pci_hp_register		(struct hotplug_slot *slot);
 extern int pci_hp_deregister		(struct hotplug_slot *slot);

drivers/pci/hotplug/pci_hotplug_core.c

@@ -74,20 +74,16 @@ static struct subsystem hotplug_slots_subsys;
 static ssize_t hotplug_slot_attr_show(struct kobject *kobj,
 		struct attribute *attr, char *buf)
 {
-	struct hotplug_slot *slot=container_of(kobj,
-			struct hotplug_slot,kobj);
-	struct hotplug_slot_attribute *attribute =
-		container_of(attr, struct hotplug_slot_attribute, attr);
+	struct hotplug_slot *slot = to_hotplug_slot(kobj);
+	struct hotplug_slot_attribute *attribute = to_hotplug_attr(attr);
 	return attribute->show ? attribute->show(slot, buf) : 0;
 }
 
 static ssize_t hotplug_slot_attr_store(struct kobject *kobj,
 		struct attribute *attr, const char *buf, size_t len)
 {
-	struct hotplug_slot *slot=container_of(kobj,
-			struct hotplug_slot,kobj);
-	struct hotplug_slot_attribute *attribute =
-		container_of(attr, struct hotplug_slot_attribute, attr);
+	struct hotplug_slot *slot = to_hotplug_slot(kobj);
+	struct hotplug_slot_attribute *attribute = to_hotplug_attr(attr);
 	return attribute->store ? attribute->store(slot, buf, len) : 0;
 }
 
@@ -96,8 +92,16 @@ static struct sysfs_ops hotplug_slot_sysfs_ops = {
 	.store = hotplug_slot_attr_store,
 };
 
+static void hotplug_slot_release(struct kobject *kobj)
+{
+	struct hotplug_slot *slot = to_hotplug_slot(kobj);
+	if (slot->release)
+		slot->release(slot);
+}
+
 static struct kobj_type hotplug_slot_ktype = {
-	.sysfs_ops = &hotplug_slot_sysfs_ops
+	.sysfs_ops = &hotplug_slot_sysfs_ops,
+	.release = &hotplug_slot_release,
 };
 
 static decl_subsys(hotplug_slots, &hotplug_slot_ktype, NULL);