diff --git a/drivers/isdn/hardware/mISDN/core.c b/drivers/isdn/hardware/mISDN/core.c
index 30bc309..611a448 100644
--- a/drivers/isdn/hardware/mISDN/core.c
+++ b/drivers/isdn/hardware/mISDN/core.c
@@ -106,7 +106,8 @@ mISDNd(void *data)
 			hhe=mISDN_HEADEXT_P(skb);
 			switch (hhe->addr) {
 				case MGR_FUNCTION:
-					err=hhe->func.ctrl(hhe->data[0], hhe->prim, skb->data);
+					err = hhe->func.ctrl(hhe->data[0], hhe->prim,
+						skb->len ? skb->data : NULL);
 					if (err) {
 						printk(KERN_WARNING "mISDNd: addr(%x) prim(%x) failed err(%x)\n",
 							hhe->addr, hhe->prim, err);
@@ -423,7 +424,8 @@ set_stack_req(mISDNstack_t *st, mISDN_pid_t *pid)
 	mISDN_pid_t	*npid;
 	u_char		*pbuf = NULL;
 
-	skb = alloc_skb(sizeof(mISDN_pid_t) + pid->maxplen, GFP_ATOMIC);
+	if (!(skb = alloc_skb(sizeof(mISDN_pid_t) + pid->maxplen, GFP_ATOMIC)))
+		return(-ENOMEM);
 	hhe = mISDN_HEADEXT_P(skb);
 	hhe->prim = MGR_SETSTACK_NW | REQUEST;
 	hhe->addr = MGR_FUNCTION;
@@ -438,6 +440,26 @@ set_stack_req(mISDNstack_t *st, mISDN_pid_t *pid)
 	return(0);
 }
 
+static int
+queue_ctrl_ready(mISDNstack_t *st, void *arg)
+{
+	struct sk_buff	*skb;
+	mISDN_headext_t	*hhe;
+
+	if (!(skb = alloc_skb(4, GFP_ATOMIC)))
+		return(-ENOMEM);
+	if (arg) /* maybe changed for future enhancements */
+		return(-EINVAL);
+	hhe = mISDN_HEADEXT_P(skb);
+	hhe->prim = MGR_CTRLREADY | INDICATION;
+	hhe->addr = MGR_FUNCTION;
+	hhe->data[0] = st;
+	hhe->func.ctrl = do_for_all_layers;
+	skb_queue_tail(&mISDN_thread.workq, skb);
+	wake_up_interruptible(&mISDN_thread.waitq);
+	return(0);
+}
+
 int
 mISDN_alloc_entity(int *entity)
 {
@@ -540,7 +562,7 @@ static int central_manager(void *data, u_int prim, void *arg) {
 	    case MGR_ADDIF | REQUEST:
 		return(add_if(data, prim, arg));
 	    case MGR_CTRLREADY | INDICATION:
-		return(do_for_all_layers(st, prim, arg));
+	    	return(queue_ctrl_ready(st, arg));
 	    case MGR_ADDSTPARA | REQUEST:
 	    case MGR_CLRSTPARA | REQUEST:
 		return(change_stack_para(st, prim, arg));
diff --git a/drivers/isdn/hardware/mISDN/core.h b/drivers/isdn/hardware/mISDN/core.h
index d62294d..9cb4999 100644
--- a/drivers/isdn/hardware/mISDN/core.h
+++ b/drivers/isdn/hardware/mISDN/core.h
@@ -43,7 +43,7 @@ extern int		get_stack_cnt(void);
 extern mISDNstack_t	*get_stack4id(u_int);
 extern mISDNstack_t	*new_stack(mISDNstack_t *, mISDNinstance_t *);
 extern int		release_stack(mISDNstack_t *);
-extern int		do_for_all_layers(mISDNstack_t *, u_int, void *);
+extern int		do_for_all_layers(void *, u_int, void *);
 extern int		change_stack_para(mISDNstack_t *, u_int, mISDN_stPara_t *);
 extern void		release_stacks(mISDNobject_t *);
 extern int		copy_pid(mISDN_pid_t *, mISDN_pid_t *, u_char *);
diff --git a/drivers/isdn/hardware/mISDN/stack.c b/drivers/isdn/hardware/mISDN/stack.c
index 2805566..1e6e1d4 100644
--- a/drivers/isdn/hardware/mISDN/stack.c
+++ b/drivers/isdn/hardware/mISDN/stack.c
@@ -303,8 +303,9 @@ release_layers(mISDNstack_t *st, u_int prim)
 }
 
 int
-do_for_all_layers(mISDNstack_t *st, u_int prim, void *arg)
+do_for_all_layers(void *data, u_int prim, void *arg)
 {
+	mISDNstack_t	*st = data;
 	mISDNinstance_t *inst;
 	mISDNlayer_t    *layer, *nl;
 	int		cnt = 0;