1 files changed, 8 insertions, 39 deletions

diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 776d8a62f77c..d80e9d4c974b 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -58,7 +58,6 @@ static struct tty_ldisc_ops *tty_ldiscs[NR_LDISCS];
 int tty_register_ldisc(struct tty_ldisc_ops *new_ldisc)
 {
 	unsigned long flags;
-	int ret = 0;
 
 	if (new_ldisc->num < N_TTY || new_ldisc->num >= NR_LDISCS)
 		return -EINVAL;
@@ -67,7 +66,7 @@ int tty_register_ldisc(struct tty_ldisc_ops *new_ldisc)
 	tty_ldiscs[new_ldisc->num] = new_ldisc;
 	raw_spin_unlock_irqrestore(&tty_ldiscs_lock, flags);
 
-	return ret;
+	return 0;
 }
 EXPORT_SYMBOL(tty_register_ldisc);
 
@@ -117,7 +116,7 @@ static void put_ldops(struct tty_ldisc_ops *ldops)
 	raw_spin_unlock_irqrestore(&tty_ldiscs_lock, flags);
 }
 
-static int tty_ldisc_autoload = IS_BUILTIN(CONFIG_LDISC_AUTOLOAD);
+int tty_ldisc_autoload = IS_BUILTIN(CONFIG_LDISC_AUTOLOAD);
 
 /**
  * tty_ldisc_get	-	take a reference to an ldisc
@@ -546,6 +545,12 @@ int tty_set_ldisc(struct tty_struct *tty, int disc)
 		goto out;
 	}
 
+	if (tty->ops->ldisc_ok) {
+		retval = tty->ops->ldisc_ok(tty, disc);
+		if (retval)
+			goto out;
+	}
+
 	old_ldisc = tty->ldisc;
 
 	/* Shutdown the old discipline. */
@@ -817,39 +822,3 @@ void tty_ldisc_deinit(struct tty_struct *tty)
 		tty_ldisc_put(tty->ldisc);
 	tty->ldisc = NULL;
 }
-
-static struct ctl_table tty_table[] = {
-	{
-		.procname	= "ldisc_autoload",
-		.data		= &tty_ldisc_autoload,
-		.maxlen		= sizeof(tty_ldisc_autoload),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-		.extra1		= SYSCTL_ZERO,
-		.extra2		= SYSCTL_ONE,
-	},
-	{ }
-};
-
-static struct ctl_table tty_dir_table[] = {
-	{
-		.procname	= "tty",
-		.mode		= 0555,
-		.child		= tty_table,
-	},
-	{ }
-};
-
-static struct ctl_table tty_root_table[] = {
-	{
-		.procname	= "dev",
-		.mode		= 0555,
-		.child		= tty_dir_table,
-	},
-	{ }
-};
-
-void tty_sysctl_init(void)
-{
-	register_sysctl_table(tty_root_table);
-}