X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fisdn%2Fcapi%2Fcapi.c;h=9d4750a0aececda9aa09e0759fa90fad19814d77;hb=42651b5c1aabf5eb60fbe98375ba127f4f6eb943;hp=623412e22c141bd1c3041411143386fe01bfb2aa;hpb=b8f433dc5cd9b910c12ef5cca351bf720d3e68c1;p=safe%2Fjmp%2Flinux-2.6

diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 623412e..9d4750a 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -45,7 +45,6 @@ MODULE_DESCRIPTION("CAPI4Linux: Userspace /dev/capi20 interface");
 MODULE_AUTHOR("Carsten Paeth");
 MODULE_LICENSE("GPL");
 
-#undef _DEBUG_REFCOUNT		/* alloc/free and open/close debug */
 #undef _DEBUG_TTYFUNCS		/* call to tty_driver */
 #undef _DEBUG_DATAFLOW		/* data flow */
 
@@ -60,10 +59,8 @@ module_param_named(major, capi_major, uint, 0);
 #define CAPINC_NR_PORTS		32
 #define CAPINC_MAX_PORTS	256
 
-static int capi_ttymajor = 191;
 static int capi_ttyminors = CAPINC_NR_PORTS;
 
-module_param_named(ttymajor, capi_ttymajor, uint, 0);
 module_param_named(ttyminors, capi_ttyminors, uint, 0);
 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 
@@ -79,14 +76,14 @@ struct capidev;
 struct capincci;
 struct capiminor;
 
-struct datahandle_queue {
+struct ackqueue_entry {
 	struct list_head	list;
 	u16			datahandle;
 };
 
 struct capiminor {
-	struct list_head list;
-	struct capincci  *nccip;
+	struct kref kref;
+
 	unsigned int      minor;
 	struct dentry *capifs_dentry;
 
@@ -95,11 +92,10 @@ struct capiminor {
 	u16		 datahandle;
 	u16		 msgid;
 
-	struct tty_struct *tty;
+	struct tty_port port;
 	int                ttyinstop;
 	int                ttyoutstop;
 	struct sk_buff    *ttyskb;
-	atomic_t           ttyopencount;
 
 	struct sk_buff_head inqueue;
 	int                 inbytes;
@@ -122,7 +118,7 @@ struct capiminor {
 static DEFINE_SPINLOCK(workaround_lock);
 
 struct capincci {
-	struct capincci *next;
+	struct list_head list;
 	u32		 ncci;
 	struct capidev	*cdev;
 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
@@ -139,9 +135,9 @@ struct capidev {
 	struct sk_buff_head recvqueue;
 	wait_queue_head_t recvwait;
 
-	struct capincci *nccis;
+	struct list_head nccis;
 
-	struct mutex ncci_list_mtx;
+	struct mutex lock;
 };
 
 /* -------- global variables ---------------------------------------- */
@@ -151,14 +147,16 @@ static LIST_HEAD(capidev_list);
 
 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 
-static DEFINE_RWLOCK(capiminor_list_lock);
-static LIST_HEAD(capiminor_list);
+static DEFINE_SPINLOCK(capiminors_lock);
+static struct capiminor **capiminors;
+
+static struct tty_driver *capinc_tty_driver;
 
 /* -------- datahandles --------------------------------------------- */
 
 static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 {
-	struct datahandle_queue *n;
+	struct ackqueue_entry *n;
 	unsigned long flags;
 
 	n = kmalloc(sizeof(*n), GFP_ATOMIC);
@@ -177,7 +175,7 @@ static int capiminor_add_ack(struct capiminor *mp, u16 datahandle)
 
 static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 {
-	struct datahandle_queue *p, *tmp;
+	struct ackqueue_entry *p, *tmp;
 	unsigned long flags;
 
 	spin_lock_irqsave(&mp->ackqlock, flags);
@@ -196,7 +194,7 @@ static int capiminor_del_ack(struct capiminor *mp, u16 datahandle)
 
 static void capiminor_del_all_ack(struct capiminor *mp)
 {
-	struct datahandle_queue *p, *tmp;
+	struct ackqueue_entry *p, *tmp;
 	unsigned long flags;
 
 	spin_lock_irqsave(&mp->ackqlock, flags);
@@ -211,88 +209,104 @@ static void capiminor_del_all_ack(struct capiminor *mp)
 
 /* -------- struct capiminor ---------------------------------------- */
 
+static const struct tty_port_operations capiminor_port_ops; /* we have none */
+
 static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci)
 {
-	struct capiminor *mp, *p;
-	unsigned int minor = 0;
-	unsigned long flags;
+	struct capiminor *mp;
+	struct device *dev;
+	unsigned int minor;
 
-	mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
+	mp = kzalloc(sizeof(*mp), GFP_KERNEL);
   	if (!mp) {
   		printk(KERN_ERR "capi: can't alloc capiminor\n");
 		return NULL;
 	}
 
+	kref_init(&mp->kref);
+
 	mp->ap = ap;
 	mp->ncci = ncci;
 	mp->msgid = 0;
-	atomic_set(&mp->ttyopencount,0);
 	INIT_LIST_HEAD(&mp->ackqueue);
 	spin_lock_init(&mp->ackqlock);
 
 	skb_queue_head_init(&mp->inqueue);
 	skb_queue_head_init(&mp->outqueue);
 
-	/* Allocate the least unused minor number.
-	 */
-	write_lock_irqsave(&capiminor_list_lock, flags);
-	if (list_empty(&capiminor_list))
-		list_add(&mp->list, &capiminor_list);
-	else {
-		list_for_each_entry(p, &capiminor_list, list) {
-			if (p->minor > minor)
-				break;
-			minor++;
-		}
-		
-		if (minor < capi_ttyminors) {
-			mp->minor = minor;
-			list_add(&mp->list, p->list.prev);
+	tty_port_init(&mp->port);
+	mp->port.ops = &capiminor_port_ops;
+
+	/* Allocate the least unused minor number. */
+	spin_lock(&capiminors_lock);
+	for (minor = 0; minor < capi_ttyminors; minor++)
+		if (!capiminors[minor]) {
+			capiminors[minor] = mp;
+			break;
 		}
-	}
-		write_unlock_irqrestore(&capiminor_list_lock, flags);
+	spin_unlock(&capiminors_lock);
 
-	if (!(minor < capi_ttyminors)) {
+	if (minor == capi_ttyminors) {
 		printk(KERN_NOTICE "capi: out of minors\n");
-			kfree(mp);
-		return NULL;
+		goto err_out1;
 	}
 
+	mp->minor = minor;
+
+	dev = tty_register_device(capinc_tty_driver, minor, NULL);
+	if (IS_ERR(dev))
+		goto err_out2;
+
 	return mp;
+
+err_out2:
+	spin_lock(&capiminors_lock);
+	capiminors[minor] = NULL;
+	spin_unlock(&capiminors_lock);
+
+err_out1:
+	kfree(mp);
+	return NULL;
 }
 
-static void capiminor_free(struct capiminor *mp)
+static void capiminor_destroy(struct kref *kref)
 {
-	unsigned long flags;
-
-	write_lock_irqsave(&capiminor_list_lock, flags);
-	list_del(&mp->list);
-	write_unlock_irqrestore(&capiminor_list_lock, flags);
+	struct capiminor *mp = container_of(kref, struct capiminor, kref);
 
 	kfree_skb(mp->ttyskb);
-	mp->ttyskb = NULL;
 	skb_queue_purge(&mp->inqueue);
 	skb_queue_purge(&mp->outqueue);
 	capiminor_del_all_ack(mp);
 	kfree(mp);
 }
 
-static struct capiminor *capiminor_find(unsigned int minor)
+static struct capiminor *capiminor_get(unsigned int minor)
 {
-	struct list_head *l;
-	struct capiminor *p = NULL;
+	struct capiminor *mp;
 
-	read_lock(&capiminor_list_lock);
-	list_for_each(l, &capiminor_list) {
-		p = list_entry(l, struct capiminor, list);
-		if (p->minor == minor)
-			break;
-	}
-	read_unlock(&capiminor_list_lock);
-	if (l == &capiminor_list)
-		return NULL;
+	spin_lock(&capiminors_lock);
+	mp = capiminors[minor];
+	if (mp)
+		kref_get(&mp->kref);
+	spin_unlock(&capiminors_lock);
+
+	return mp;
+}
+
+static inline void capiminor_put(struct capiminor *mp)
+{
+	kref_put(&mp->kref, capiminor_destroy);
+}
 
-	return p;
+static void capiminor_free(struct capiminor *mp)
+{
+	tty_unregister_device(capinc_tty_driver, mp->minor);
+
+	spin_lock(&capiminors_lock);
+	capiminors[mp->minor] = NULL;
+	spin_unlock(&capiminors_lock);
+
+	capiminor_put(mp);
 }
 
 /* -------- struct capincci ----------------------------------------- */
@@ -300,45 +314,50 @@ static struct capiminor *capiminor_find(unsigned int minor)
 static void capincci_alloc_minor(struct capidev *cdev, struct capincci *np)
 {
 	struct capiminor *mp;
+	dev_t device;
 
 	if (!(cdev->userflags & CAPIFLAG_HIGHJACKING))
 		return;
 
 	mp = np->minorp = capiminor_alloc(&cdev->ap, np->ncci);
 	if (mp) {
-		mp->nccip = np;
-#ifdef _DEBUG_REFCOUNT
-		printk(KERN_DEBUG "set mp->nccip\n");
-#endif
-		mp->capifs_dentry =
-			capifs_new_ncci(mp->minor,
-					MKDEV(capi_ttymajor, mp->minor));
+		device = MKDEV(capinc_tty_driver->major, mp->minor);
+		mp->capifs_dentry = capifs_new_ncci(mp->minor, device);
 	}
 }
 
 static void capincci_free_minor(struct capincci *np)
 {
 	struct capiminor *mp = np->minorp;
+	struct tty_struct *tty;
 
 	if (mp) {
 		capifs_free_ncci(mp->capifs_dentry);
-		if (mp->tty) {
-			mp->nccip = NULL;
-#ifdef _DEBUG_REFCOUNT
-			printk(KERN_DEBUG "reset mp->nccip\n");
-#endif
-			tty_hangup(mp->tty);
-		} else {
-			capiminor_free(mp);
+
+		tty = tty_port_tty_get(&mp->port);
+		if (tty) {
+			tty_vhangup(tty);
+			tty_kref_put(tty);
 		}
+
+		capiminor_free(mp);
 	}
 }
 
 static inline unsigned int capincci_minor_opencount(struct capincci *np)
 {
 	struct capiminor *mp = np->minorp;
+	unsigned int count = 0;
+	struct tty_struct *tty;
 
-	return mp ? atomic_read(&mp->ttyopencount) : 0;
+	if (mp) {
+		tty = tty_port_tty_get(&mp->port);
+		if (tty) {
+			count = tty->count;
+			tty_kref_put(tty);
+		}
+	}
+	return count;
 }
 
 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
@@ -356,9 +375,9 @@ static inline unsigned int capincci_minor_opencount(struct capincci *np)
 
 static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 {
-	struct capincci *np, **pp;
+	struct capincci *np;
 
-	np = kzalloc(sizeof(*np), GFP_ATOMIC);
+	np = kzalloc(sizeof(*np), GFP_KERNEL);
 	if (!np)
 		return NULL;
 	np->ncci = ncci;
@@ -366,79 +385,31 @@ static struct capincci *capincci_alloc(struct capidev *cdev, u32 ncci)
 
 	capincci_alloc_minor(cdev, np);
 
-	for (pp=&cdev->nccis; *pp; pp = &(*pp)->next)
-		;
-	*pp = np;
-        return np;
+	list_add_tail(&np->list, &cdev->nccis);
+
+	return np;
 }
 
 static void capincci_free(struct capidev *cdev, u32 ncci)
 {
-	struct capincci *np, **pp;
+	struct capincci *np, *tmp;
 
-	pp=&cdev->nccis;
-	while (*pp) {
-		np = *pp;
+	list_for_each_entry_safe(np, tmp, &cdev->nccis, list)
 		if (ncci == 0xffffffff || np->ncci == ncci) {
-			*pp = (*pp)->next;
 			capincci_free_minor(np);
+			list_del(&np->list);
 			kfree(np);
-			if (*pp == NULL) return;
-		} else {
-			pp = &(*pp)->next;
 		}
-	}
 }
 
 static struct capincci *capincci_find(struct capidev *cdev, u32 ncci)
 {
-	struct capincci *p;
-
-	for (p=cdev->nccis; p ; p = p->next) {
-		if (p->ncci == ncci)
-			break;
-	}
-	return p;
-}
-
-/* -------- struct capidev ------------------------------------------ */
-
-static struct capidev *capidev_alloc(void)
-{
-	struct capidev *cdev;
-
-	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
-	if (!cdev)
-		return NULL;
-
-	mutex_init(&cdev->ncci_list_mtx);
-	skb_queue_head_init(&cdev->recvqueue);
-	init_waitqueue_head(&cdev->recvwait);
-
-	mutex_lock(&capidev_list_lock);
-	list_add_tail(&cdev->list, &capidev_list);
-	mutex_unlock(&capidev_list_lock);
-
-        return cdev;
-}
-
-static void capidev_free(struct capidev *cdev)
-{
-	mutex_lock(&capidev_list_lock);
-	list_del(&cdev->list);
-	mutex_unlock(&capidev_list_lock);
-
-	if (cdev->ap.applid) {
-		capi20_release(&cdev->ap);
-		cdev->ap.applid = 0;
-	}
-	skb_queue_purge(&cdev->recvqueue);
-
-	mutex_lock(&cdev->ncci_list_mtx);
-	capincci_free(cdev, 0xffffffff);
-	mutex_unlock(&cdev->ncci_list_mtx);
+	struct capincci *np;
 
-	kfree(cdev);
+	list_for_each_entry(np, &cdev->nccis, list)
+		if (np->ncci == ncci)
+			return np;
+	return NULL;
 }
 
 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
@@ -465,65 +436,86 @@ gen_data_b3_resp_for(struct capiminor *mp, struct sk_buff *skb)
 
 static int handle_recv_skb(struct capiminor *mp, struct sk_buff *skb)
 {
+	unsigned int datalen = skb->len - CAPIMSG_LEN(skb->data);
+	struct tty_struct *tty;
 	struct sk_buff *nskb;
-	int datalen;
 	u16 errcode, datahandle;
 	struct tty_ldisc *ld;
-	
-	datalen = skb->len - CAPIMSG_LEN(skb->data);
-	if (mp->tty == NULL)
-	{
+	int ret = -1;
+
+	tty = tty_port_tty_get(&mp->port);
+	if (!tty) {
 #ifdef _DEBUG_DATAFLOW
 		printk(KERN_DEBUG "capi: currently no receiver\n");
 #endif
 		return -1;
 	}
 	
-	ld = tty_ldisc_ref(mp->tty);
-	if (ld == NULL)
-		return -1;
+	ld = tty_ldisc_ref(tty);
+	if (!ld) {
+		/* fatal error, do not requeue */
+		ret = 0;
+		kfree_skb(skb);
+		goto deref_tty;
+	}
+
 	if (ld->ops->receive_buf == NULL) {
 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 		printk(KERN_DEBUG "capi: ldisc has no receive_buf function\n");
 #endif
-		goto bad;
+		/* fatal error, do not requeue */
+		goto free_skb;
 	}
 	if (mp->ttyinstop) {
 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 		printk(KERN_DEBUG "capi: recv tty throttled\n");
 #endif
-		goto bad;
+		goto deref_ldisc;
 	}
-	if (mp->tty->receive_room < datalen) {
+
+	if (tty->receive_room < datalen) {
 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 		printk(KERN_DEBUG "capi: no room in tty\n");
 #endif
-		goto bad;
+		goto deref_ldisc;
 	}
-	if ((nskb = gen_data_b3_resp_for(mp, skb)) == NULL) {
+
+	nskb = gen_data_b3_resp_for(mp, skb);
+	if (!nskb) {
 		printk(KERN_ERR "capi: gen_data_b3_resp failed\n");
-		goto bad;
+		goto deref_ldisc;
 	}
-	datahandle = CAPIMSG_U16(skb->data,CAPIMSG_BASELEN+4);
+
+	datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN + 4);
+
 	errcode = capi20_put_message(mp->ap, nskb);
-	if (errcode != CAPI_NOERROR) {
+
+	if (errcode == CAPI_NOERROR) {
+		skb_pull(skb, CAPIMSG_LEN(skb->data));
+#ifdef _DEBUG_DATAFLOW
+		printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
+					datahandle, skb->len);
+#endif
+		ld->ops->receive_buf(tty, skb->data, NULL, skb->len);
+	} else {
 		printk(KERN_ERR "capi: send DATA_B3_RESP failed=%x\n",
 				errcode);
 		kfree_skb(nskb);
-		goto bad;
+
+		if (errcode == CAPI_SENDQUEUEFULL)
+			goto deref_ldisc;
 	}
-	(void)skb_pull(skb, CAPIMSG_LEN(skb->data));
-#ifdef _DEBUG_DATAFLOW
-	printk(KERN_DEBUG "capi: DATA_B3_RESP %u len=%d => ldisc\n",
-				datahandle, skb->len);
-#endif
-	ld->ops->receive_buf(mp->tty, skb->data, NULL, skb->len);
+
+free_skb:
+	ret = 0;
 	kfree_skb(skb);
+
+deref_ldisc:
 	tty_ldisc_deref(ld);
-	return 0;
-bad:
-	tty_ldisc_deref(ld);
-	return -1;
+
+deref_tty:
+	tty_kref_put(tty);
+	return ret;
 }
 
 static void handle_minor_recv(struct capiminor *mp)
@@ -542,16 +534,22 @@ static void handle_minor_recv(struct capiminor *mp)
 
 static int handle_minor_send(struct capiminor *mp)
 {
+	struct tty_struct *tty;
 	struct sk_buff *skb;
 	u16 len;
 	int count = 0;
 	u16 errcode;
 	u16 datahandle;
 
-	if (mp->tty && mp->ttyoutstop) {
+	tty = tty_port_tty_get(&mp->port);
+	if (!tty)
+		return 0;
+
+	if (mp->ttyoutstop) {
 #if defined(_DEBUG_DATAFLOW) || defined(_DEBUG_TTYFUNCS)
 		printk(KERN_DEBUG "capi: send: tty stopped\n");
 #endif
+		tty_kref_put(tty);
 		return 0;
 	}
 
@@ -574,6 +572,7 @@ static int handle_minor_send(struct capiminor *mp)
 		if (capiminor_add_ack(mp, datahandle) < 0) {
 			skb_pull(skb, CAPI_DATA_B3_REQ_LEN);
 			skb_queue_head(&mp->outqueue, skb);
+			tty_kref_put(tty);
 			return count;
 		}
 		errcode = capi20_put_message(mp->ap, skb);
@@ -600,6 +599,7 @@ static int handle_minor_send(struct capiminor *mp)
 		mp->outbytes -= len;
 		kfree_skb(skb);
 	}
+	tty_kref_put(tty);
 	return count;
 }
 
@@ -610,42 +610,36 @@ static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 {
 	struct capidev *cdev = ap->private;
 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
+	struct tty_struct *tty;
 	struct capiminor *mp;
 	u16 datahandle;
 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 	struct capincci *np;
-	u32 ncci;
 	unsigned long flags;
 
+	mutex_lock(&cdev->lock);
+
 	if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_CONF) {
 		u16 info = CAPIMSG_U16(skb->data, 12); // Info field
-		if ((info & 0xff00) == 0) {
-			mutex_lock(&cdev->ncci_list_mtx);
+		if ((info & 0xff00) == 0)
 			capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
-			mutex_unlock(&cdev->ncci_list_mtx);
-		}
 	}
-	if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND) {
-		mutex_lock(&cdev->ncci_list_mtx);
+	if (CAPIMSG_CMD(skb->data) == CAPI_CONNECT_B3_IND)
 		capincci_alloc(cdev, CAPIMSG_NCCI(skb->data));
-		mutex_unlock(&cdev->ncci_list_mtx);
-	}
+
 	spin_lock_irqsave(&workaround_lock, flags);
 	if (CAPIMSG_COMMAND(skb->data) != CAPI_DATA_B3) {
 		skb_queue_tail(&cdev->recvqueue, skb);
 		wake_up_interruptible(&cdev->recvwait);
-		spin_unlock_irqrestore(&workaround_lock, flags);
-		return;
+		goto unlock_out;
 	}
-	ncci = CAPIMSG_CONTROL(skb->data);
-	for (np = cdev->nccis; np && np->ncci != ncci; np = np->next)
-		;
+
+	np = capincci_find(cdev, CAPIMSG_CONTROL(skb->data));
 	if (!np) {
 		printk(KERN_ERR "BUG: capi_signal: ncci not found\n");
 		skb_queue_tail(&cdev->recvqueue, skb);
 		wake_up_interruptible(&cdev->recvwait);
-		spin_unlock_irqrestore(&workaround_lock, flags);
-		return;
+		goto unlock_out;
 	}
 
 #ifndef CONFIG_ISDN_CAPI_MIDDLEWARE
@@ -658,8 +652,7 @@ static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 	if (!mp) {
 		skb_queue_tail(&cdev->recvqueue, skb);
 		wake_up_interruptible(&cdev->recvwait);
-		spin_unlock_irqrestore(&workaround_lock, flags);
-		return;
+		goto unlock_out;
 	}
 	if (CAPIMSG_SUBCOMMAND(skb->data) == CAPI_IND) {
 		datahandle = CAPIMSG_U16(skb->data, CAPIMSG_BASELEN+4+4+2);
@@ -681,8 +674,11 @@ static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 #endif
 		kfree_skb(skb);
 		(void)capiminor_del_ack(mp, datahandle);
-		if (mp->tty)
-			tty_wakeup(mp->tty);
+		tty = tty_port_tty_get(&mp->port);
+		if (tty) {
+			tty_wakeup(tty);
+			tty_kref_put(tty);
+		}
 		(void)handle_minor_send(mp);
 
 	} else {
@@ -692,7 +688,9 @@ static void capi_recv_message(struct capi20_appl *ap, struct sk_buff *skb)
 	}
 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
 
+unlock_out:
 	spin_unlock_irqrestore(&workaround_lock, flags);
+	mutex_unlock(&cdev->lock);
 }
 
 /* -------- file_operations for capidev ----------------------------- */
@@ -703,24 +701,19 @@ capi_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 	struct capidev *cdev = (struct capidev *)file->private_data;
 	struct sk_buff *skb;
 	size_t copied;
+	int err;
 
 	if (!cdev->ap.applid)
 		return -ENODEV;
 
-	if ((skb = skb_dequeue(&cdev->recvqueue)) == NULL) {
-
+	skb = skb_dequeue(&cdev->recvqueue);
+	if (!skb) {
 		if (file->f_flags & O_NONBLOCK)
 			return -EAGAIN;
-
-		for (;;) {
-			interruptible_sleep_on(&cdev->recvwait);
-			if ((skb = skb_dequeue(&cdev->recvqueue)) != NULL)
-				break;
-			if (signal_pending(current))
-				break;
-		}
-		if (skb == NULL)
-			return -ERESTARTNOHAND;
+		err = wait_event_interruptible(cdev->recvwait,
+				(skb = skb_dequeue(&cdev->recvqueue)));
+		if (err)
+			return err;
 	}
 	if (skb->len > count) {
 		skb_queue_head(&cdev->recvqueue, skb);
@@ -770,9 +763,9 @@ capi_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos
 	CAPIMSG_SETAPPID(skb->data, cdev->ap.applid);
 
 	if (CAPIMSG_CMD(skb->data) == CAPI_DISCONNECT_B3_RESP) {
-		mutex_lock(&cdev->ncci_list_mtx);
+		mutex_lock(&cdev->lock);
 		capincci_free(cdev, CAPIMSG_NCCI(skb->data));
-		mutex_unlock(&cdev->ncci_list_mtx);
+		mutex_unlock(&cdev->lock);
 	}
 
 	cdev->errcode = capi20_put_message(&cdev->ap, skb);
@@ -805,30 +798,35 @@ capi_ioctl(struct inode *inode, struct file *file,
 	   unsigned int cmd, unsigned long arg)
 {
 	struct capidev *cdev = file->private_data;
-	struct capi20_appl *ap = &cdev->ap;
 	capi_ioctl_struct data;
 	int retval = -EINVAL;
 	void __user *argp = (void __user *)arg;
 
 	switch (cmd) {
 	case CAPI_REGISTER:
-		{
-			if (ap->applid)
-				return -EEXIST;
+		mutex_lock(&cdev->lock);
 
-			if (copy_from_user(&cdev->ap.rparam, argp,
-					   sizeof(struct capi_register_params)))
-				return -EFAULT;
-			
-			cdev->ap.private = cdev;
-			cdev->ap.recv_message = capi_recv_message;
-			cdev->errcode = capi20_register(ap);
-			if (cdev->errcode) {
-				ap->applid = 0;
-				return -EIO;
-			}
+		if (cdev->ap.applid) {
+			retval = -EEXIST;
+			goto register_out;
+		}
+		if (copy_from_user(&cdev->ap.rparam, argp,
+				   sizeof(struct capi_register_params))) {
+			retval = -EFAULT;
+			goto register_out;
+		}
+		cdev->ap.private = cdev;
+		cdev->ap.recv_message = capi_recv_message;
+		cdev->errcode = capi20_register(&cdev->ap);
+		retval = (int)cdev->ap.applid;
+		if (cdev->errcode) {
+			cdev->ap.applid = 0;
+			retval = -EIO;
 		}
-		return (int)ap->applid;
+
+register_out:
+		mutex_unlock(&cdev->lock);
+		return retval;
 
 	case CAPI_GET_VERSION:
 		{
@@ -927,94 +925,104 @@ capi_ioctl(struct inode *inode, struct file *file,
 		return 0;
 
 	case CAPI_SET_FLAGS:
-	case CAPI_CLR_FLAGS:
-		{
-			unsigned userflags;
-			if (copy_from_user(&userflags, argp,
-					   sizeof(userflags)))
-				return -EFAULT;
-			if (cmd == CAPI_SET_FLAGS)
-				cdev->userflags |= userflags;
-			else
-				cdev->userflags &= ~userflags;
-		}
-		return 0;
+	case CAPI_CLR_FLAGS: {
+		unsigned userflags;
+
+		if (copy_from_user(&userflags, argp, sizeof(userflags)))
+			return -EFAULT;
 
+		mutex_lock(&cdev->lock);
+		if (cmd == CAPI_SET_FLAGS)
+			cdev->userflags |= userflags;
+		else
+			cdev->userflags &= ~userflags;
+		mutex_unlock(&cdev->lock);
+		return 0;
+	}
 	case CAPI_GET_FLAGS:
 		if (copy_to_user(argp, &cdev->userflags,
 				 sizeof(cdev->userflags)))
 			return -EFAULT;
 		return 0;
 
-	case CAPI_NCCI_OPENCOUNT:
-		{
-			struct capincci *nccip;
-			unsigned ncci;
-			int count = 0;
-			if (copy_from_user(&ncci, argp, sizeof(ncci)))
-				return -EFAULT;
+	case CAPI_NCCI_OPENCOUNT: {
+		struct capincci *nccip;
+		unsigned ncci;
+		int count = 0;
 
-			mutex_lock(&cdev->ncci_list_mtx);
-			if ((nccip = capincci_find(cdev, (u32) ncci)) == NULL) {
-				mutex_unlock(&cdev->ncci_list_mtx);
-				return 0;
-			}
-			count += capincci_minor_opencount(nccip);
-			mutex_unlock(&cdev->ncci_list_mtx);
-			return count;
-		}
-		return 0;
+		if (copy_from_user(&ncci, argp, sizeof(ncci)))
+			return -EFAULT;
+
+		mutex_lock(&cdev->lock);
+		nccip = capincci_find(cdev, (u32)ncci);
+		if (nccip)
+			count = capincci_minor_opencount(nccip);
+		mutex_unlock(&cdev->lock);
+		return count;
+	}
 
 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
-	case CAPI_NCCI_GETUNIT:
-		{
-			struct capincci *nccip;
-			struct capiminor *mp;
-			unsigned ncci;
-			int unit = 0;
-			if (copy_from_user(&ncci, argp,
-					   sizeof(ncci)))
-				return -EFAULT;
-			mutex_lock(&cdev->ncci_list_mtx);
-			nccip = capincci_find(cdev, (u32) ncci);
-			if (!nccip || (mp = nccip->minorp) == NULL) {
-				mutex_unlock(&cdev->ncci_list_mtx);
-				return -ESRCH;
-			}
-			unit = mp->minor;
-			mutex_unlock(&cdev->ncci_list_mtx);
-			return unit;
+	case CAPI_NCCI_GETUNIT: {
+		struct capincci *nccip;
+		struct capiminor *mp;
+		unsigned ncci;
+		int unit = -ESRCH;
+
+		if (copy_from_user(&ncci, argp, sizeof(ncci)))
+			return -EFAULT;
+
+		mutex_lock(&cdev->lock);
+		nccip = capincci_find(cdev, (u32)ncci);
+		if (nccip) {
+			mp = nccip->minorp;
+			if (mp)
+				unit = mp->minor;
 		}
-		return 0;
+		mutex_unlock(&cdev->lock);
+		return unit;
+	}
 #endif /* CONFIG_ISDN_CAPI_MIDDLEWARE */
+
+	default:
+		return -EINVAL;
 	}
-	return -EINVAL;
 }
 
-static int
-capi_open(struct inode *inode, struct file *file)
+static int capi_open(struct inode *inode, struct file *file)
 {
-	int ret;
-	
-	lock_kernel();
-	if (file->private_data)
-		ret = -EEXIST;
-	else if ((file->private_data = capidev_alloc()) == NULL)
-		ret = -ENOMEM;
-	else
-		ret = nonseekable_open(inode, file);
-	unlock_kernel();
-	return ret;
+	struct capidev *cdev;
+
+	cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
+	if (!cdev)
+		return -ENOMEM;
+
+	mutex_init(&cdev->lock);
+	skb_queue_head_init(&cdev->recvqueue);
+	init_waitqueue_head(&cdev->recvwait);
+	INIT_LIST_HEAD(&cdev->nccis);
+	file->private_data = cdev;
+
+	mutex_lock(&capidev_list_lock);
+	list_add_tail(&cdev->list, &capidev_list);
+	mutex_unlock(&capidev_list_lock);
+
+	return nonseekable_open(inode, file);
 }
 
-static int
-capi_release(struct inode *inode, struct file *file)
+static int capi_release(struct inode *inode, struct file *file)
 {
-	struct capidev *cdev = (struct capidev *)file->private_data;
+	struct capidev *cdev = file->private_data;
 
-	capidev_free(cdev);
-	file->private_data = NULL;
-	
+	mutex_lock(&capidev_list_lock);
+	list_del(&cdev->list);
+	mutex_unlock(&capidev_list_lock);
+
+	if (cdev->ap.applid)
+		capi20_release(&cdev->ap);
+	skb_queue_purge(&cdev->recvqueue);
+	capincci_free(cdev, 0xffffffff);
+
+	kfree(cdev);
 	return 0;
 }
 
@@ -1033,59 +1041,57 @@ static const struct file_operations capi_fops =
 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
 /* -------- tty_operations for capincci ----------------------------- */
 
-static int capinc_tty_open(struct tty_struct * tty, struct file * file)
+static int
+capinc_tty_install(struct tty_driver *driver, struct tty_struct *tty)
 {
-	struct capiminor *mp;
-	unsigned long flags;
+	int idx = tty->index;
+	struct capiminor *mp = capiminor_get(idx);
+	int ret = tty_init_termios(tty);
+
+	if (ret == 0) {
+		tty_driver_kref_get(driver);
+		tty->count++;
+		tty->driver_data = mp;
+		driver->ttys[idx] = tty;
+	} else
+		capiminor_put(mp);
+	return ret;
+}
 
-	if ((mp = capiminor_find(iminor(file->f_path.dentry->d_inode))) == NULL)
-		return -ENXIO;
-	if (mp->nccip == NULL)
-		return -ENXIO;
+static void capinc_tty_cleanup(struct tty_struct *tty)
+{
+	struct capiminor *mp = tty->driver_data;
+	tty->driver_data = NULL;
+	capiminor_put(mp);
+}
+
+static int capinc_tty_open(struct tty_struct *tty, struct file *filp)
+{
+	struct capiminor *mp = tty->driver_data;
+	unsigned long flags;
+	int err;
 
-	tty->driver_data = (void *)mp;
+	err = tty_port_open(&mp->port, tty, filp);
+	if (err)
+		return err;
 
 	spin_lock_irqsave(&workaround_lock, flags);
-	if (atomic_read(&mp->ttyopencount) == 0)
-		mp->tty = tty;
-	atomic_inc(&mp->ttyopencount);
-#ifdef _DEBUG_REFCOUNT
-	printk(KERN_DEBUG "capinc_tty_open ocount=%d\n", atomic_read(&mp->ttyopencount));
-#endif
 	handle_minor_recv(mp);
 	spin_unlock_irqrestore(&workaround_lock, flags);
 	return 0;
 }
 
-static void capinc_tty_close(struct tty_struct * tty, struct file * file)
+static void capinc_tty_close(struct tty_struct *tty, struct file *filp)
 {
-	struct capiminor *mp;
+	struct capiminor *mp = tty->driver_data;
 
-	mp = (struct capiminor *)tty->driver_data;
-	if (mp)	{
-		if (atomic_dec_and_test(&mp->ttyopencount)) {
-#ifdef _DEBUG_REFCOUNT
-			printk(KERN_DEBUG "capinc_tty_close lastclose\n");
-#endif
-			tty->driver_data = NULL;
-			mp->tty = NULL;
-		}
-#ifdef _DEBUG_REFCOUNT
-		printk(KERN_DEBUG "capinc_tty_close ocount=%d\n", atomic_read(&mp->ttyopencount));
-#endif
-		if (mp->nccip == NULL)
-			capiminor_free(mp);
-	}
-
-#ifdef _DEBUG_REFCOUNT
-	printk(KERN_DEBUG "capinc_tty_close\n");
-#endif
+	tty_port_close(&mp->port, tty, filp);
 }
 
-static int capinc_tty_write(struct tty_struct * tty,
+static int capinc_tty_write(struct tty_struct *tty,
 			    const unsigned char *buf, int count)
 {
-	struct capiminor *mp = (struct capiminor *)tty->driver_data;
+	struct capiminor *mp = tty->driver_data;
 	struct sk_buff *skb;
 	unsigned long flags;
 
@@ -1093,13 +1099,6 @@ static int capinc_tty_write(struct tty_struct * tty,
 	printk(KERN_DEBUG "capinc_tty_write(count=%d)\n", count);
 #endif
 
-	if (!mp || !mp->nccip) {
-#ifdef _DEBUG_TTYFUNCS
-		printk(KERN_DEBUG "capinc_tty_write: mp or mp->ncci NULL\n");
-#endif
-		return 0;
-	}
-
 	spin_lock_irqsave(&workaround_lock, flags);
 	skb = mp->ttyskb;
 	if (skb) {
@@ -1121,14 +1120,13 @@ static int capinc_tty_write(struct tty_struct * tty,
 	skb_queue_tail(&mp->outqueue, skb);
 	mp->outbytes += skb->len;
 	(void)handle_minor_send(mp);
-	(void)handle_minor_recv(mp);
 	spin_unlock_irqrestore(&workaround_lock, flags);
 	return count;
 }
 
 static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
 {
-	struct capiminor *mp = (struct capiminor *)tty->driver_data;
+	struct capiminor *mp = tty->driver_data;
 	struct sk_buff *skb;
 	unsigned long flags;
 	int ret = 1;
@@ -1137,13 +1135,6 @@ static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
 	printk(KERN_DEBUG "capinc_put_char(%u)\n", ch);
 #endif
 
-	if (!mp || !mp->nccip) {
-#ifdef _DEBUG_TTYFUNCS
-		printk(KERN_DEBUG "capinc_tty_put_char: mp or mp->ncci NULL\n");
-#endif
-		return 0;
-	}
-
 	spin_lock_irqsave(&workaround_lock, flags);
 	skb = mp->ttyskb;
 	if (skb) {
@@ -1172,7 +1163,7 @@ static int capinc_tty_put_char(struct tty_struct *tty, unsigned char ch)
 
 static void capinc_tty_flush_chars(struct tty_struct *tty)
 {
-	struct capiminor *mp = (struct capiminor *)tty->driver_data;
+	struct capiminor *mp = tty->driver_data;
 	struct sk_buff *skb;
 	unsigned long flags;
 
@@ -1180,13 +1171,6 @@ static void capinc_tty_flush_chars(struct tty_struct *tty)
 	printk(KERN_DEBUG "capinc_tty_flush_chars\n");
 #endif
 
-	if (!mp || !mp->nccip) {
-#ifdef _DEBUG_TTYFUNCS
-		printk(KERN_DEBUG "capinc_tty_flush_chars: mp or mp->ncci NULL\n");
-#endif
-		return;
-	}
-
 	spin_lock_irqsave(&workaround_lock, flags);
 	skb = mp->ttyskb;
 	if (skb) {
@@ -1201,14 +1185,9 @@ static void capinc_tty_flush_chars(struct tty_struct *tty)
 
 static int capinc_tty_write_room(struct tty_struct *tty)
 {
-	struct capiminor *mp = (struct capiminor *)tty->driver_data;
+	struct capiminor *mp = tty->driver_data;
 	int room;
-	if (!mp || !mp->nccip) {
-#ifdef _DEBUG_TTYFUNCS
-		printk(KERN_DEBUG "capinc_tty_write_room: mp or mp->ncci NULL\n");
-#endif
-		return 0;
-	}
+
 	room = CAPINC_MAX_SENDQUEUE-skb_queue_len(&mp->outqueue);
 	room *= CAPI_MAX_BLKSIZE;
 #ifdef _DEBUG_TTYFUNCS
@@ -1219,13 +1198,8 @@ static int capinc_tty_write_room(struct tty_struct *tty)
 
 static int capinc_tty_chars_in_buffer(struct tty_struct *tty)
 {
-	struct capiminor *mp = (struct capiminor *)tty->driver_data;
-	if (!mp || !mp->nccip) {
-#ifdef _DEBUG_TTYFUNCS
-		printk(KERN_DEBUG "capinc_tty_chars_in_buffer: mp or mp->ncci NULL\n");
-#endif
-		return 0;
-	}
+	struct capiminor *mp = tty->driver_data;
+
 #ifdef _DEBUG_TTYFUNCS
 	printk(KERN_DEBUG "capinc_tty_chars_in_buffer = %d nack=%d sq=%d rq=%d\n",
 			mp->outbytes, mp->nack,
@@ -1254,62 +1228,61 @@ static void capinc_tty_set_termios(struct tty_struct *tty, struct ktermios * old
 #endif
 }
 
-static void capinc_tty_throttle(struct tty_struct * tty)
+static void capinc_tty_throttle(struct tty_struct *tty)
 {
-	struct capiminor *mp = (struct capiminor *)tty->driver_data;
+	struct capiminor *mp = tty->driver_data;
 #ifdef _DEBUG_TTYFUNCS
 	printk(KERN_DEBUG "capinc_tty_throttle\n");
 #endif
-	if (mp)
-		mp->ttyinstop = 1;
+	mp->ttyinstop = 1;
 }
 
-static void capinc_tty_unthrottle(struct tty_struct * tty)
+static void capinc_tty_unthrottle(struct tty_struct *tty)
 {
-	struct capiminor *mp = (struct capiminor *)tty->driver_data;
+	struct capiminor *mp = tty->driver_data;
 	unsigned long flags;
+
 #ifdef _DEBUG_TTYFUNCS
 	printk(KERN_DEBUG "capinc_tty_unthrottle\n");
 #endif
-	if (mp) {
-		spin_lock_irqsave(&workaround_lock, flags);
-		mp->ttyinstop = 0;
-		handle_minor_recv(mp);
-		spin_unlock_irqrestore(&workaround_lock, flags);
-	}
+	spin_lock_irqsave(&workaround_lock, flags);
+	mp->ttyinstop = 0;
+	handle_minor_recv(mp);
+	spin_unlock_irqrestore(&workaround_lock, flags);
 }
 
 static void capinc_tty_stop(struct tty_struct *tty)
 {
-	struct capiminor *mp = (struct capiminor *)tty->driver_data;
+	struct capiminor *mp = tty->driver_data;
+
 #ifdef _DEBUG_TTYFUNCS
 	printk(KERN_DEBUG "capinc_tty_stop\n");
 #endif
-	if (mp) {
-		mp->ttyoutstop = 1;
-	}
+	mp->ttyoutstop = 1;
 }
 
 static void capinc_tty_start(struct tty_struct *tty)
 {
-	struct capiminor *mp = (struct capiminor *)tty->driver_data;
+	struct capiminor *mp = tty->driver_data;
 	unsigned long flags;
+
 #ifdef _DEBUG_TTYFUNCS
 	printk(KERN_DEBUG "capinc_tty_start\n");
 #endif
-	if (mp) {
-		spin_lock_irqsave(&workaround_lock, flags);
-		mp->ttyoutstop = 0;
-		(void)handle_minor_send(mp);
-		spin_unlock_irqrestore(&workaround_lock, flags);
-	}
+	spin_lock_irqsave(&workaround_lock, flags);
+	mp->ttyoutstop = 0;
+	(void)handle_minor_send(mp);
+	spin_unlock_irqrestore(&workaround_lock, flags);
 }
 
 static void capinc_tty_hangup(struct tty_struct *tty)
 {
+	struct capiminor *mp = tty->driver_data;
+
 #ifdef _DEBUG_TTYFUNCS
 	printk(KERN_DEBUG "capinc_tty_hangup\n");
 #endif
+	tty_port_hangup(&mp->port);
 }
 
 static int capinc_tty_break_ctl(struct tty_struct *tty, int state)
@@ -1341,8 +1314,6 @@ static void capinc_tty_send_xchar(struct tty_struct *tty, char ch)
 #endif
 }
 
-static struct tty_driver *capinc_tty_driver;
-
 static const struct tty_operations capinc_ops = {
 	.open = capinc_tty_open,
 	.close = capinc_tty_close,
@@ -1362,25 +1333,34 @@ static const struct tty_operations capinc_ops = {
 	.flush_buffer = capinc_tty_flush_buffer,
 	.set_ldisc = capinc_tty_set_ldisc,
 	.send_xchar = capinc_tty_send_xchar,
+	.install = capinc_tty_install,
+	.cleanup = capinc_tty_cleanup,
 };
 
-static int capinc_tty_init(void)
+static int __init capinc_tty_init(void)
 {
 	struct tty_driver *drv;
-	
+	int err;
+
 	if (capi_ttyminors > CAPINC_MAX_PORTS)
 		capi_ttyminors = CAPINC_MAX_PORTS;
 	if (capi_ttyminors <= 0)
 		capi_ttyminors = CAPINC_NR_PORTS;
 
-	drv = alloc_tty_driver(capi_ttyminors);
-	if (!drv)
+	capiminors = kzalloc(sizeof(struct capi_minor *) * capi_ttyminors,
+			     GFP_KERNEL);
+	if (!capiminors)
 		return -ENOMEM;
 
+	drv = alloc_tty_driver(capi_ttyminors);
+	if (!drv) {
+		kfree(capiminors);
+		return -ENOMEM;
+	}
 	drv->owner = THIS_MODULE;
 	drv->driver_name = "capi_nc";
 	drv->name = "capi";
-	drv->major = capi_ttymajor;
+	drv->major = 0;
 	drv->minor_start = 0;
 	drv->type = TTY_DRIVER_TYPE_SERIAL;
 	drv->subtype = SERIAL_TYPE_NORMAL;
@@ -1389,24 +1369,27 @@ static int capinc_tty_init(void)
 	drv->init_termios.c_oflag = OPOST | ONLCR;
 	drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 	drv->init_termios.c_lflag = 0;
-	drv->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_RESET_TERMIOS;
+	drv->flags =
+		TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS |
+		TTY_DRIVER_DYNAMIC_DEV;
 	tty_set_operations(drv, &capinc_ops);
-	if (tty_register_driver(drv)) {
+
+	err = tty_register_driver(drv);
+	if (err) {
 		put_tty_driver(drv);
+		kfree(capiminors);
 		printk(KERN_ERR "Couldn't register capi_nc driver\n");
-		return -1;
+		return err;
 	}
 	capinc_tty_driver = drv;
 	return 0;
 }
 
-static void capinc_tty_exit(void)
+static void __exit capinc_tty_exit(void)
 {
-	struct tty_driver *drv = capinc_tty_driver;
-	int retval;
-	if ((retval = tty_unregister_driver(drv)))
-		printk(KERN_ERR "capi: failed to unregister capi_nc driver (%d)\n", retval);
-	put_tty_driver(drv);
+	tty_unregister_driver(capinc_tty_driver);
+	put_tty_driver(capinc_tty_driver);
+	kfree(capiminors);
 }
 
 #else /* !CONFIG_ISDN_CAPI_MIDDLEWARE */
@@ -1464,18 +1447,15 @@ static const struct file_operations capi20_proc_fops = {
  */
 static int capi20ncci_proc_show(struct seq_file *m, void *v)
 {
-        struct capidev *cdev;
-        struct capincci *np;
-	struct list_head *l;
+	struct capidev *cdev;
+	struct capincci *np;
 
 	mutex_lock(&capidev_list_lock);
-	list_for_each(l, &capidev_list) {
-		cdev = list_entry(l, struct capidev, list);
-		for (np=cdev->nccis; np; np = np->next) {
-			seq_printf(m, "%d 0x%x\n",
-				       cdev->ap.applid,
-				       np->ncci);
-		}
+	list_for_each_entry(cdev, &capidev_list, list) {
+		mutex_lock(&cdev->lock);
+		list_for_each_entry(np, &cdev->nccis, list)
+			seq_printf(m, "%d 0x%x\n", cdev->ap.applid, np->ncci);
+		mutex_unlock(&cdev->lock);
 	}
 	mutex_unlock(&capidev_list_lock);
 	return 0;