Protect tty drivers list with tty_mutex

[powerpc.git] / drivers / char / tty_io.c

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 5d405a1..7710a6a 100644 (file)
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -3770,7 +3770,9 @@ int tty_register_driver(struct tty_driver *driver)
        if (!driver->put_char)
                driver->put_char = tty_default_put_char;
        
+       mutex_lock(&tty_mutex);
        list_add(&driver->tty_drivers, &tty_drivers);
+       mutex_unlock(&tty_mutex);
        
        if ( !(driver->flags & TTY_DRIVER_DYNAMIC_DEV) ) {
                for(i = 0; i < driver->num; i++)
@@ -3796,8 +3798,9 @@ int tty_unregister_driver(struct tty_driver *driver)
 
        unregister_chrdev_region(MKDEV(driver->major, driver->minor_start),
                                driver->num);
-
+       mutex_lock(&tty_mutex);
        list_del(&driver->tty_drivers);
+       mutex_unlock(&tty_mutex);
 
        /*
         * Free the termios and termios_locked structures because