diff --git a/drivers/isdn/capi/capidrv.c b/drivers/isdn/capi/capidrv.c
index 52118a9..de11764 100644
--- a/drivers/isdn/capi/capidrv.c
+++ b/drivers/isdn/capi/capidrv.c
@@ -2209,19 +2209,24 @@ static int capidrv_delcontr(u16 contr)
 }
 
 
-static void lower_callback(unsigned int cmd, u32 contr, void *data)
+static int
+lower_callback(struct notifier_block *nb, unsigned long val, void *v)
 {
+	capi_profile profile;
+	u32 contr = (long)v;
 
-	switch (cmd) {
-	case KCI_CONTRUP:
+	switch (val) {
+	case CAPICTR_UP:
 		printk(KERN_INFO "capidrv: controller %hu upn", contr);
-		(void) capidrv_addcontr(contr, (capi_profile *) data);
+		if (capi20_get_profile(contr, &profile) == CAPI_NOERROR)
+			(void) capidrv_addcontr(contr, &profile);
 		break;
-	case KCI_CONTRDOWN:
+	case CAPICTR_DOWN:
 		printk(KERN_INFO "capidrv: controller %hu downn", contr);
 		(void) capidrv_delcontr(contr);
 		break;
 	}
+	return NOTIFY_OK;
 }
 
 /*
@@ -2283,6 +2288,10 @@ static void __exit proc_exit(void)
     }
 }
 
+static struct notifier_block capictr_nb = {
+	.notifier_call = lower_callback,
+};
+
 static int __init capidrv_init(void)
 {
 	capi_profile profile;
@@ -2299,7 +2308,7 @@ static int __init capidrv_init(void)
 		return -EIO;
 	}
 
-	capi20_set_callback(&global.ap, lower_callback);
+	register_capictr_notifier(&capictr_nb);
 
 	errcode = capi20_get_profile(0, &profile);
 	if (errcode != CAPI_NOERROR) {
@@ -2321,6 +2330,7 @@ static int __init capidrv_init(void)
 
 static void __exit capidrv_exit(void)
 {
+	unregister_capictr_notifier(&capictr_nb);
 	capi20_release(&global.ap);
 
 	proc_exit();
diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c
index 3fcc95b..0fda05d 100644
--- a/drivers/isdn/capi/kcapi.c
+++ b/drivers/isdn/capi/kcapi.c
@@ -44,12 +44,10 @@ module_param(showcapimsgs, uint, 0);
 
 /* ------------------------------------------------------------- */
 
-struct capi_notifier {
+struct capictr_event {
 	struct work_struct work;
-	unsigned int cmd;
+	unsigned int type;
 	u32 controller;
-	u16 applid;
-	u32 ncci;
 };
 
 /* ------------------------------------------------------------- */
@@ -71,6 +69,8 @@ struct capi_ctr *capi_controller[CAPI_MAXCONTR];
 
 static int ncontrollers;
 
+static BLOCKING_NOTIFIER_HEAD(ctr_notifier_list);
+
 /* -------- controller ref counting -------------------------------------- */
 
 static inline struct capi_ctr *
@@ -165,8 +165,6 @@ static void release_appl(struct capi_ctr *ctr, u16 applid)
 	capi_ctr_put(ctr);
 }
 
-/* -------- KCI_CONTRUP --------------------------------------- */
-
 static void notify_up(u32 contr)
 {
 	struct capi20_appl *ap;
@@ -188,16 +186,11 @@ static void notify_up(u32 contr)
 			if (!ap || ap->release_in_progress)
 				continue;
 			register_appl(ctr, applid, &ap->rparam);
-			if (ap->callback && !ap->release_in_progress)
-				ap->callback(KCI_CONTRUP, contr,
-					     &ctr->profile);
 		}
 	} else
 		printk(KERN_WARNING "%s: invalid contr %dn", __func__, contr);
 }
 
-/* -------- KCI_CONTRDOWN ------------------------------------- */
-
 static void ctr_down(struct capi_ctr *ctr)
 {
 	struct capi20_appl *ap;
@@ -215,11 +208,8 @@ static void ctr_down(struct capi_ctr *ctr)
 
 	for (applid = 1; applid <= CAPI_MAXAPPL; applid++) {
 		ap = get_capi_appl_by_nr(applid);
-		if (ap && !ap->release_in_progress) {
-			if (ap->callback)
-				ap->callback(KCI_CONTRDOWN, ctr->cnr, NULL);
+		if (ap && !ap->release_in_progress)
 			capi_ctr_put(ctr);
-		}
 	}
 }
 
@@ -237,45 +227,63 @@ static void notify_down(u32 contr)
 		printk(KERN_WARNING "%s: invalid contr %dn", __func__, contr);
 }
 
-static void notify_handler(struct work_struct *work)
+static int
+notify_handler(struct notifier_block *nb, unsigned long val, void *v)
 {
-	struct capi_notifier *np =
-		container_of(work, struct capi_notifier, work);
+	u32 contr = (long)v;
 
-	switch (np->cmd) {
-	case KCI_CONTRUP:
-		notify_up(np->controller);
+	switch (val) {
+	case CAPICTR_UP:
+		notify_up(contr);
 		break;
-	case KCI_CONTRDOWN:
-		notify_down(np->controller);
+	case CAPICTR_DOWN:
+		notify_down(contr);
 		break;
 	}
+	return NOTIFY_OK;
+}
+
+static void do_notify_work(struct work_struct *work)
+{
+	struct capictr_event *event =
+		container_of(work, struct capictr_event, work);
 
-	kfree(np);
+	blocking_notifier_call_chain(&ctr_notifier_list, event->type,
+				     (void *)(long)event->controller);
+	kfree(event);
 }
 
 /*
  * The notifier will result in adding/deleteing of devices. Devices can
  * only removed in user process, not in bh.
  */
-static int notify_push(unsigned int cmd, u32 controller, u16 applid, u32 ncci)
+static int notify_push(unsigned int event_type, u32 controller)
 {
-	struct capi_notifier *np = kmalloc(sizeof(*np), GFP_ATOMIC);
+	struct capictr_event *event = kmalloc(sizeof(*event), GFP_ATOMIC);
 
-	if (!np)
+	if (!event)
 		return -ENOMEM;
 
-	INIT_WORK(&np->work, notify_handler);
-	np->cmd = cmd;
-	np->controller = controller;
-	np->applid = applid;
-	np->ncci = ncci;
+	INIT_WORK(&event->work, do_notify_work);
+	event->type = event_type;
+	event->controller = controller;
 
-	schedule_work(&np->work);
+	schedule_work(&event->work);
 	return 0;
 }
 
-	
+int register_capictr_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&ctr_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_capictr_notifier);
+
+int unregister_capictr_notifier(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_unregister(&ctr_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_capictr_notifier);
+
 /* -------- Receiver ------------------------------------------ */
 
 static void recv_handler(struct work_struct *work)
@@ -401,7 +409,7 @@ void capi_ctr_ready(struct capi_ctr *ctr)
 	printk(KERN_NOTICE "kcapi: controller [%03d] "%s" ready.n",
 	       ctr->cnr, ctr->name);
 
-	notify_push(KCI_CONTRUP, ctr->cnr, 0, 0);
+	notify_push(CAPICTR_UP, ctr->cnr);
 }
 
 EXPORT_SYMBOL(capi_ctr_ready);
@@ -418,7 +426,7 @@ void capi_ctr_down(struct capi_ctr *ctr)
 {
 	printk(KERN_NOTICE "kcapi: controller [%03d] down.n", ctr->cnr);
 
-	notify_push(KCI_CONTRDOWN, ctr->cnr, 0, 0);
+	notify_push(CAPICTR_DOWN, ctr->cnr);
 }
 
 EXPORT_SYMBOL(capi_ctr_down);
@@ -637,7 +645,6 @@ u16 capi20_register(struct capi20_appl *ap)
 	ap->nrecvdatapkt = 0;
 	ap->nsentctlpkt = 0;
 	ap->nsentdatapkt = 0;
-	ap->callback = NULL;
 	mutex_init(&ap->recv_mtx);
 	skb_queue_head_init(&ap->recv_queue);
 	INIT_WORK(&ap->recv_work, recv_handler);
@@ -1141,30 +1148,6 @@ int capi20_manufacturer(unsigned int cmd, void __user *data)
 
 EXPORT_SYMBOL(capi20_manufacturer);
 
-/* temporary hack */
-
-/**
- * capi20_set_callback() - set CAPI application notification callback function
- * @ap:		CAPI application descriptor structure.
- * @callback:	callback function (NULL to remove).
- *
- * If not NULL, the callback function will be called to notify the
- * application of the addition or removal of a controller.
- * The first argument (cmd) will tell whether the controller was added
- * (KCI_CONTRUP) or removed (KCI_CONTRDOWN).
- * The second argument (contr) will be the controller number.
- * For cmd==KCI_CONTRUP the third argument (data) will be a pointer to the
- * new controller's capability profile structure.
- */
-
-void capi20_set_callback(struct capi20_appl *ap,
-			 void (*callback) (unsigned int cmd, __u32 contr, void *data))
-{
-	ap->callback = callback;
-}
-
-EXPORT_SYMBOL(capi20_set_callback);
-
 /* ------------------------------------------------------------- */
 /* -------- Init & Cleanup ------------------------------------- */
 /* ------------------------------------------------------------- */
@@ -1173,10 +1156,17 @@ EXPORT_SYMBOL(capi20_set_callback);
  * init / exit functions
  */
 
+static struct notifier_block capictr_nb = {
+	.notifier_call = notify_handler,
+	.priority = INT_MAX,
+};
+
 static int __init kcapi_init(void)
 {
 	int err;
 
+	register_capictr_notifier(&capictr_nb);
+
 	err = cdebug_init();
 	if (!err)
 		kcapi_proc_init();
diff --git a/include/linux/kernelcapi.h b/include/linux/kernelcapi.h
index a53e932..9c26839 100644
--- a/include/linux/kernelcapi.h
+++ b/include/linux/kernelcapi.h
@@ -48,9 +48,7 @@ typedef struct kcapi_carddef {
 #include <linux/list.h>
 #include <linux/skbuff.h>
 #include <linux/workqueue.h>
-
-#define	KCI_CONTRUP	0	/* arg: struct capi_profile */
-#define	KCI_CONTRDOWN	1	/* arg: NULL */
+#include <linux/notifier.h>
 
 struct capi20_appl {
 	u16 applid;
@@ -67,11 +65,6 @@ struct capi20_appl {
 	struct sk_buff_head recv_queue;
 	struct work_struct recv_work;
 	int release_in_progress;
-
-	/* ugly hack to allow for notification of added/removed
-	 * controllers. The Right Way (tm) is known. XXX
-	 */
-	void (*callback) (unsigned int cmd, __u32 contr, void *data);
 };
 
 u16 capi20_isinstalled(void);
@@ -84,11 +77,11 @@ u16 capi20_get_serial(u32 contr, u8 serial[CAPI_SERIAL_LEN]);
 u16 capi20_get_profile(u32 contr, struct capi_profile *profp);
 int capi20_manufacturer(unsigned int cmd, void __user *data);
 
-/* temporary hack XXX */
-void capi20_set_callback(struct capi20_appl *ap, 
-			 void (*callback) (unsigned int cmd, __u32 contr, void *data));
-
+#define CAPICTR_UP			0
+#define CAPICTR_DOWN			1
 
+int register_capictr_notifier(struct notifier_block *nb);
+int unregister_capictr_notifier(struct notifier_block *nb);
 
 #define CAPI_NOERROR                      0x0000
 
