diff -Nru a/drivers/base/class_simple.c b/drivers/base/class_simple.c
--- a/drivers/base/class_simple.c	Sun Feb  8 20:45:44 2004
+++ b/drivers/base/class_simple.c	Sun Feb  8 20:45:44 2004
@@ -170,6 +170,24 @@
 EXPORT_SYMBOL(class_simple_device_add);
 
 /**
+ * class_simple_set_hotplug - set the hotplug callback in the embedded struct class
+ * @cs: pointer to the struct class_simple to hold the pointer
+ * @hotplug: function pointer to the hotplug function
+ *
+ * Implement and set a hotplug function to add environment variables specific to this 
+ * class on the hotplug event.
+ */
+int class_simple_set_hotplug(struct class_simple *cs, 
+	int (*hotplug)(struct class_device *dev, char **envp, int num_envp, char *buffer, int buffer_size))
+{
+	if ((cs == NULL) || (IS_ERR(cs)))
+		return -ENODEV;
+	cs->class.hotplug = hotplug;
+	return 0;
+}
+EXPORT_SYMBOL(class_simple_set_hotplug);
+
+/**
  * class_simple_device_remove - removes a class device that was created with class_simple_device_add()
  * @dev: the dev_t of the device that was previously registered.
  *
diff -Nru a/drivers/base/core.c b/drivers/base/core.c
--- a/drivers/base/core.c	Sun Feb  8 20:45:44 2004
+++ b/drivers/base/core.c	Sun Feb  8 20:45:44 2004
@@ -76,7 +76,6 @@
 static void device_release(struct kobject * kobj)
 {
 	struct device * dev = to_dev(kobj);
-	struct completion * c = dev->complete;
 
 	if (dev->release)
 		dev->release(dev);
@@ -86,8 +85,6 @@
 			dev->bus_id);
 		WARN_ON(1);
 	}
-	if (c)
-		complete(c);
 }
 
 static struct kobj_type ktype_device = {
@@ -355,25 +352,6 @@
 
 
 /**
- *	device_unregister_wait - Unregister device and wait for it to be freed.
- *	@dev: Device to unregister.
- *
- *	For the cases where the caller needs to wait for all references to
- *	be dropped from the device before continuing (e.g. modules with
- *	statically allocated devices), this function uses a completion struct
- *	to wait, along with a matching complete() in device_release() above.
- */
-
-void device_unregister_wait(struct device * dev)
-{
-	struct completion c;
-	init_completion(&c);
-	dev->complete = &c;
-	device_unregister(dev);
-	wait_for_completion(&c);
-}
-
-/**
  *	device_for_each_child - device child iterator.
  *	@dev:	parent struct device.
  *	@data:	data for the callback.
@@ -421,7 +399,6 @@
 
 EXPORT_SYMBOL(device_del);
 EXPORT_SYMBOL(device_unregister);
-EXPORT_SYMBOL(device_unregister_wait);
 EXPORT_SYMBOL(get_device);
 EXPORT_SYMBOL(put_device);
 EXPORT_SYMBOL(device_find);
diff -Nru a/drivers/char/tty_io.c b/drivers/char/tty_io.c
--- a/drivers/char/tty_io.c	Sun Feb  8 20:45:45 2004
+++ b/drivers/char/tty_io.c	Sun Feb  8 20:45:45 2004
@@ -2264,7 +2264,6 @@
 	if (driver->refcount)
 		return -EBUSY;
 
-	cdev_unmap(MKDEV(driver->major, driver->minor_start), driver->num);
 	unregister_chrdev_region(MKDEV(driver->major, driver->minor_start),
 				driver->num);
 
diff -Nru a/drivers/ieee1394/amdtp.c b/drivers/ieee1394/amdtp.c
--- a/drivers/ieee1394/amdtp.c	Sun Feb  8 20:45:45 2004
+++ b/drivers/ieee1394/amdtp.c	Sun Feb  8 20:45:45 2004
@@ -1308,7 +1308,6 @@
 
         hpsb_unregister_highlevel(&amdtp_highlevel);
 	devfs_remove("amdtp");
-	cdev_unmap(IEEE1394_AMDTP_DEV, 16);
 	cdev_del(&amdtp_cdev);
 
 	HPSB_INFO("Unloaded AMDTP driver");
diff -Nru a/drivers/ieee1394/dv1394.c b/drivers/ieee1394/dv1394.c
--- a/drivers/ieee1394/dv1394.c	Sun Feb  8 20:45:45 2004
+++ b/drivers/ieee1394/dv1394.c	Sun Feb  8 20:45:45 2004
@@ -2609,7 +2609,6 @@
 	hpsb_unregister_protocol(&dv1394_driver);
 
 	hpsb_unregister_highlevel(&dv1394_highlevel);
-	cdev_unmap(IEEE1394_DV1394_DEV, 16);
 	cdev_del(&dv1394_cdev);
 	devfs_remove("ieee1394/dv");
 }
diff -Nru a/drivers/ieee1394/raw1394.c b/drivers/ieee1394/raw1394.c
--- a/drivers/ieee1394/raw1394.c	Sun Feb  8 20:45:44 2004
+++ b/drivers/ieee1394/raw1394.c	Sun Feb  8 20:45:44 2004
@@ -2682,7 +2682,6 @@
 static void __exit cleanup_raw1394(void)
 {
 	hpsb_unregister_protocol(&raw1394_driver);
-	cdev_unmap(IEEE1394_RAW1394_DEV, 1);
 	cdev_del(&raw1394_cdev);
         devfs_remove(RAW1394_DEVICE_NAME);
         hpsb_unregister_highlevel(&raw1394_highlevel);
diff -Nru a/drivers/ieee1394/video1394.c b/drivers/ieee1394/video1394.c
--- a/drivers/ieee1394/video1394.c	Sun Feb  8 20:45:44 2004
+++ b/drivers/ieee1394/video1394.c	Sun Feb  8 20:45:44 2004
@@ -1447,7 +1447,6 @@
 	hpsb_unregister_highlevel(&video1394_highlevel);
 
 	devfs_remove(VIDEO1394_DRIVER_NAME);
-	cdev_unmap(IEEE1394_VIDEO1394_DEV, 16);
 	cdev_del(&video1394_cdev);
 
 	PRINT_G(KERN_INFO, "Removed " VIDEO1394_DRIVER_NAME " module");
diff -Nru a/drivers/scsi/sg.c b/drivers/scsi/sg.c
--- a/drivers/scsi/sg.c	Sun Feb  8 20:45:44 2004
+++ b/drivers/scsi/sg.c	Sun Feb  8 20:45:44 2004
@@ -1521,7 +1521,6 @@
 	if (sdp) {
 		sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic");
 		class_simple_device_remove(MKDEV(SCSI_GENERIC_MAJOR, k));
-		cdev_unmap(MKDEV(SCSI_GENERIC_MAJOR, k), 1);
 		cdev_del(sdp->cdev);
 		sdp->cdev = NULL;
 		devfs_remove("%s/generic", scsidp->devfs_name);
diff -Nru a/drivers/scsi/st.c b/drivers/scsi/st.c
--- a/drivers/scsi/st.c	Sun Feb  8 20:45:45 2004
+++ b/drivers/scsi/st.c	Sun Feb  8 20:45:45 2004
@@ -3946,8 +3946,6 @@
 				if (cdev == STm->cdevs[j])
 					cdev = NULL;
 				sysfs_remove_link(&STm->cdevs[j]->kobj, "device");
-				cdev_unmap(MKDEV(SCSI_TAPE_MAJOR,
-						 TAPE_MINOR(dev_num, mode, j)), 1);
 				cdev_del(STm->cdevs[j]);
 			}
 		}
@@ -3990,8 +3988,6 @@
 				for (j=0; j < 2; j++) {
 					sysfs_remove_link(&tpnt->modes[mode].cdevs[j]->kobj,
 							  "device");
-					cdev_unmap(MKDEV(SCSI_TAPE_MAJOR,
-							 TAPE_MINOR(i, mode, j)), 1);
 					cdev_del(tpnt->modes[mode].cdevs[j]);
 					tpnt->modes[mode].cdevs[j] = NULL;
 				}
diff -Nru a/fs/char_dev.c b/fs/char_dev.c
--- a/fs/char_dev.c	Sun Feb  8 20:45:44 2004
+++ b/fs/char_dev.c	Sun Feb  8 20:45:44 2004
@@ -240,7 +240,6 @@
 int unregister_chrdev(unsigned int major, const char *name)
 {
 	struct char_device_struct *cd;
-	cdev_unmap(MKDEV(major, 0), 256);
 	cd = __unregister_chrdev_region(major, 0, 256);
 	if (cd && cd->cdev)
 		cdev_del(cd->cdev);
@@ -347,16 +346,19 @@
 	err = kobj_map(cdev_map, dev, count, NULL, exact_match, exact_lock, p);
 	if (err)
 		kobject_del(&p->kobj);
+	p->dev = dev;
+	p->count = count;
 	return err;
 }
 
-void cdev_unmap(dev_t dev, unsigned count)
+static void cdev_unmap(dev_t dev, unsigned count)
 {
 	kobj_unmap(cdev_map, dev, count);
 }
 
 void cdev_del(struct cdev *p)
 {
+	cdev_unmap(p->dev, p->count);
 	kobject_del(&p->kobj);
 	kobject_put(&p->kobj);
 }
@@ -458,6 +460,5 @@
 EXPORT_SYMBOL(cdev_put);
 EXPORT_SYMBOL(cdev_del);
 EXPORT_SYMBOL(cdev_add);
-EXPORT_SYMBOL(cdev_unmap);
 EXPORT_SYMBOL(register_chrdev);
 EXPORT_SYMBOL(unregister_chrdev);
diff -Nru a/include/linux/cdev.h b/include/linux/cdev.h
--- a/include/linux/cdev.h	Sun Feb  8 20:45:45 2004
+++ b/include/linux/cdev.h	Sun Feb  8 20:45:45 2004
@@ -7,6 +7,8 @@
 	struct module *owner;
 	struct file_operations *ops;
 	struct list_head list;
+	dev_t dev;
+	unsigned int count;
 };
 
 void cdev_init(struct cdev *, struct file_operations *);
@@ -20,8 +22,6 @@
 int cdev_add(struct cdev *, dev_t, unsigned);
 
 void cdev_del(struct cdev *);
-
-void cdev_unmap(dev_t, unsigned);
 
 void cd_forget(struct inode *);
 
diff -Nru a/include/linux/device.h b/include/linux/device.h
--- a/include/linux/device.h	Sun Feb  8 20:45:45 2004
+++ b/include/linux/device.h	Sun Feb  8 20:45:45 2004
@@ -253,6 +253,8 @@
 extern void class_simple_destroy(struct class_simple *cs);
 extern struct class_device *class_simple_device_add(struct class_simple *cs, dev_t dev, struct device *device, const char *fmt, ...)
 	__attribute__((format(printf,4,5)));
+extern int class_simple_set_hotplug(struct class_simple *, 
+	int (*hotplug)(struct class_device *dev, char **envp, int num_envp, char *buffer, int buffer_size));
 extern void class_simple_device_remove(dev_t dev);
 
 
@@ -263,7 +265,6 @@
 	struct list_head children;
 	struct device 	* parent;
 
-	struct completion * complete;	/* Notification for freeing device. */
 	struct kobject kobj;
 	char	bus_id[BUS_ID_SIZE];	/* position on parent bus */
 
@@ -311,7 +312,6 @@
  */
 extern int device_register(struct device * dev);
 extern void device_unregister(struct device * dev);
-extern void device_unregister_wait(struct device * dev);
 extern void device_initialize(struct device * dev);
 extern int device_add(struct device * dev);
 extern void device_del(struct device * dev);
diff -Nru a/lib/kobject.c b/lib/kobject.c
--- a/lib/kobject.c	Sun Feb  8 20:45:45 2004
+++ b/lib/kobject.c	Sun Feb  8 20:45:45 2004
@@ -630,6 +630,9 @@
 EXPORT_SYMBOL(kobject_unregister);
 EXPORT_SYMBOL(kobject_get);
 EXPORT_SYMBOL(kobject_put);
+EXPORT_SYMBOL(kobject_add);
+EXPORT_SYMBOL(kobject_del);
+EXPORT_SYMBOL(kobject_rename);
 EXPORT_SYMBOL(kobject_hotplug);
 
 EXPORT_SYMBOL(kset_register);