Char: rocket, remove potential leak in module_init

if (controller && !request_region) then we leaked a tty driver struct, fix it
by adding function deinit tail with goto-ing into it (and from other fail
paths too)

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/char/rocket.c

@@ -2359,14 +2359,14 @@ static const struct tty_operations rocket_ops = {
  */
 static int __init rp_init(void)
 {
-	int retval, pci_boards_found, isa_boards_found, i;
+	int ret = -ENOMEM, pci_boards_found, isa_boards_found, i;
 
 	printk(KERN_INFO "RocketPort device driver module, version %s, %s\n",
 	       ROCKET_VERSION, ROCKET_DATE);
 
 	rocket_driver = alloc_tty_driver(MAX_RP_PORTS);
 	if (!rocket_driver)
-		return -ENOMEM;
+		goto err;
 
 	/*
 	 *  If board 1 is non-zero, there is at least one ISA configured.  If controller is 
@@ -2381,8 +2381,11 @@ static int __init rp_init(void)
 
 	/*  If an ISA card is configured, reserve the 4 byte IO space for the Mudbac controller */
 	if (controller && (!request_region(controller, 4, "Comtrol RocketPort"))) {
-		printk(KERN_INFO "Unable to reserve IO region for first configured ISA RocketPort controller 0x%lx.  Driver exiting \n", controller);
-		return -EBUSY;
+		printk(KERN_ERR "Unable to reserve IO region for first "
+			"configured ISA RocketPort controller 0x%lx.  "
+			"Driver exiting\n", controller);
+		ret = -EBUSY;
+		goto err_tty;
 	}
 
 	/*  Store ISA variable retrieved from command line or .conf file. */
@@ -2423,11 +2426,10 @@ static int __init rp_init(void)
 #endif
 	tty_set_operations(rocket_driver, &rocket_ops);
 
-	retval = tty_register_driver(rocket_driver);
-	if (retval < 0) {
-		printk(KERN_INFO "Couldn't install tty RocketPort driver (error %d)\n", -retval);
-		put_tty_driver(rocket_driver);
-		return -1;
+	ret = tty_register_driver(rocket_driver);
+	if (ret < 0) {
+		printk(KERN_ERR "Couldn't install tty RocketPort driver\n");
+		goto err_tty;
 	}
 
 #ifdef ROCKET_DEBUG_OPEN
@@ -2454,14 +2456,18 @@ static int __init rp_init(void)
 	max_board = pci_boards_found + isa_boards_found;
 
 	if (max_board == 0) {
-		printk(KERN_INFO "No rocketport ports found; unloading driver.\n");
-		del_timer_sync(&rocket_timer);
-		tty_unregister_driver(rocket_driver);
-		put_tty_driver(rocket_driver);
-		return -ENXIO;
+		printk(KERN_ERR "No rocketport ports found; unloading driver\n");
+		ret = -ENXIO;
+		goto err_ttyu;
 	}
 
 	return 0;
+err_ttyu:
+	tty_unregister_driver(rocket_driver);
+err_tty:
+	put_tty_driver(rocket_driver);
+err:
+	return ret;
 }