[PATCH] tty_driver refcounting

arch/alpha/kernel/srmcons.c converted to dynamic allocation

arch/alpha/kernel/srmcons.c

@@ -264,16 +264,9 @@ srmcons_close(struct tty_struct *tty, struct file *filp)
 }
 
 
-static struct tty_driver srmcons_driver = {
-	.driver_name	= "srm",
-	.name		= "srm",
-	.magic		= TTY_DRIVER_MAGIC,
-	.major		= 0, 	/* dynamic */
-	.minor_start	= 0,
-	.num		= MAX_SRM_CONSOLE_DEVICES,
-	.type		= TTY_DRIVER_TYPE_SYSTEM,
-	.subtype	= SYSTEM_TYPE_SYSCONS,
+static struct tty_driver *srmcons_driver;
 
+static struct tty_operations srmcons_ops = {
 	.open		= srmcons_open,
 	.close		= srmcons_close,
 	.write		= srmcons_write,
@@ -285,8 +278,25 @@ static int __init
 srmcons_init(void)
 {
 	if (srm_is_registered_console) {
-		srmcons_driver.init_termios = tty_std_termios;
-		return tty_register_driver(&srmcons_driver);
+		struct tty_driver *driver;
+		int err;
+
+		driver = alloc_tty_driver(MAX_SRM_CONSOLE_DEVICES);
+		if (!driver)
+			return -ENOMEM;
+		driver->driver_name = "srm";
+		driver->name = "srm";
+		driver->major = 0; 	/* dynamic */
+		driver->minor_start = 0;
+		driver->type = TTY_DRIVER_TYPE_SYSTEM;
+		driver->subtype = SYSTEM_TYPE_SYSCONS;
+		driver->init_termios = tty_std_termios;
+		err = tty_register_driver(driver);
+		if (err) {
+			put_tty_driver(driver);
+			return err;
+		}
+		srmcons_driver = driver;
 	}
 
 	return -ENODEV;
@@ -312,7 +322,7 @@ static struct tty_driver *
 srm_console_device(struct console *co, int *index)
 {
 	*index = co->index;
-	return &srmcons_driver;
+	return srmcons_driver;
 }
 
 static int __init