---

yaml
---
r: 4229
b: refs/heads/master
c: 7805b1b
h: refs/heads/master
i:
  4227: ac13c87
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 64e4da57964c03da9a03087a398cade81b7bb496
+refs/heads/master: 7805b1b29ffdd252dfef36aa28d7bda70cd586d3

trunk/drivers/char/hvc_console.c

@@ -192,12 +192,21 @@ void hvc_console_print(struct console *co, const char *b, unsigned count)
 
 static struct tty_driver *hvc_console_device(struct console *c, int *index)
 {
+	if (vtermnos[c->index] == -1)
+		return NULL;
+
 	*index = c->index;
 	return hvc_driver;
 }
 
 static int __init hvc_console_setup(struct console *co, char *options)
 {
+	if (co->index < 0 || co->index >= MAX_NR_HVC_CONSOLES)
+		return -ENODEV;
+
+	if (vtermnos[co->index] == -1)
+		return -ENODEV;
+
 	return 0;
 }
 
@@ -227,12 +236,21 @@ console_initcall(hvc_console_init);
  */
 int hvc_instantiate(uint32_t vtermno, int index)
 {
+	struct hvc_struct *hp;
+
 	if (index < 0 || index >= MAX_NR_HVC_CONSOLES)
 		return -1;
 
 	if (vtermnos[index] != -1)
 		return -1;
 
+	/* make sure no no tty has been registerd in this index */
+	hp = hvc_get_by_index(index);
+	if (hp) {
+		kobject_put(&hp->kobj);
+		return -1;
+	}
+
 	vtermnos[index] = vtermno;
 
 	/* reserve all indices upto and including this index */