TTY: centralize fail paths in tty_register_driver
Currently, some failures are handled in if's false branches, some at
the end of tty_register_driver via goto-labels. Let us handle the
failures at the end of the functions to have the failure handling at
a single place. The only thing needed is to label the lines properly
and jump there.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index b425c79..d6e045b 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -3144,10 +3144,8 @@
dev = MKDEV(driver->major, driver->minor_start);
error = register_chrdev_region(dev, driver->num, driver->name);
}
- if (error < 0) {
- kfree(p);
- return error;
- }
+ if (error < 0)
+ goto err_free_p;
if (p) {
driver->ttys = (struct tty_struct **)p;
@@ -3160,13 +3158,8 @@
cdev_init(&driver->cdev, &tty_fops);
driver->cdev.owner = driver->owner;
error = cdev_add(&driver->cdev, dev, driver->num);
- if (error) {
- unregister_chrdev_region(dev, driver->num);
- driver->ttys = NULL;
- driver->termios = NULL;
- kfree(p);
- return error;
- }
+ if (error)
+ goto err_unreg_char;
mutex_lock(&tty_mutex);
list_add(&driver->tty_drivers, &tty_drivers);
@@ -3193,13 +3186,14 @@
list_del(&driver->tty_drivers);
mutex_unlock(&tty_mutex);
+err_unreg_char:
unregister_chrdev_region(dev, driver->num);
driver->ttys = NULL;
driver->termios = NULL;
+err_free_p:
kfree(p);
return error;
}
-
EXPORT_SYMBOL(tty_register_driver);
/*