TTY: HVC, use count from tty_port

Now, count is used from tty_port and protected by tty_port->lock.

n_outbuf is left unprotected in hvc_hangup now, because there is no
point to hold any lock, since other uses are unprotected too.

Signed-off-by: Jiri Slaby <[e-mail]>
Cc: [e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/hvc/hvc_console.c

···
 	if (!(hp = hvc_get_by_index(tty->index)))
 		return -ENODEV;
 
-	spin_lock_irqsave(&hp->lock, flags);
+	spin_lock_irqsave(&hp->port.lock, flags);
 	/* Check and then increment for fast path open. */
-	if (hp->count++ > 0) {
+	if (hp->port.count++ > 0) {
+		spin_unlock_irqrestore(&hp->port.lock, flags);
+		/* FIXME why taking a reference here? */
 		tty_kref_get(tty);
-		spin_unlock_irqrestore(&hp->lock, flags);
 		hvc_kick();
 		return 0;
 	} /* else count == 0 */
+	spin_unlock_irqrestore(&hp->port.lock, flags);
 
 	tty->driver_data = hp;
-	spin_unlock_irqrestore(&hp->lock, flags);
-
 	tty_port_tty_set(&hp->port, tty);
 
 	if (hp->ops->notifier_add)
···
 
 	hp = tty->driver_data;
 
-	spin_lock_irqsave(&hp->lock, flags);
+	spin_lock_irqsave(&hp->port.lock, flags);
 
-	if (--hp->count == 0) {
-		spin_unlock_irqrestore(&hp->lock, flags);
+	if (--hp->port.count == 0) {
+		spin_unlock_irqrestore(&hp->port.lock, flags);
 		/* We are done with the tty pointer now. */
 		tty_port_tty_set(&hp->port, NULL);
 
···
 		 */
 		tty_wait_until_sent_from_close(tty, HVC_CLOSE_WAIT);
 	} else {
-		if (hp->count < 0)
+		if (hp->port.count < 0)
 			printk(KERN_ERR "hvc_close %X: oops, count is %d\n",
-				hp->vtermno, hp->count);
-		spin_unlock_irqrestore(&hp->lock, flags);
+				hp->vtermno, hp->port.count);
+		spin_unlock_irqrestore(&hp->port.lock, flags);
 	}
 
 	tty_kref_put(tty);
···
 	/* cancel pending tty resize work */
 	cancel_work_sync(&hp->tty_resize);
 
-	spin_lock_irqsave(&hp->lock, flags);
+	spin_lock_irqsave(&hp->port.lock, flags);
 
 	/*
 	 * The N_TTY line discipline has problems such that in a close vs
 	 * open->hangup case this can be called after the final close so prevent
 	 * that from happening for now.
 	 */
-	if (hp->count <= 0) {
-		spin_unlock_irqrestore(&hp->lock, flags);
+	if (hp->port.count <= 0) {
+		spin_unlock_irqrestore(&hp->port.lock, flags);
 		return;
 	}
 
-	temp_open_count = hp->count;
-	hp->count = 0;
-	hp->n_outbuf = 0;
-	spin_unlock_irqrestore(&hp->lock, flags);
+	temp_open_count = hp->port.count;
+	hp->port.count = 0;
+	spin_unlock_irqrestore(&hp->port.lock, flags);
 	tty_port_tty_set(&hp->port, NULL);
+
+	hp->n_outbuf = 0;
 
 	if (hp->ops->notifier_hangup)
 		hp->ops->notifier_hangup(hp, hp->data);
···
 	if (!hp)
 		return -EPIPE;
 
-	if (hp->count <= 0)
+	/* FIXME what's this (unprotected) check for? */
+	if (hp->port.count <= 0)
 		return -EIO;
 
 	spin_lock_irqsave(&hp->lock, flags);

drivers/tty/hvc/hvc_console.h

···
 	struct tty_port port;
 	spinlock_t lock;
 	int index;
-	int count;
 	int do_wakeup;
 	char *outbuf;
 	int outbuf_size;