[PATCH 5/8] ldisc n_tty: add new method n_tty_inherit_ops()

[Rodolfo Giometti <giometti@linux.it>]

This new method can be used to init a new struct tty_ldisc_ops as the
default tty_ldisc_N_TTY struct.

Signed-off-by: Rodolfo Giometti <giometti@linux.it>
---
 drivers/char/n_tty.c |    9 +++++++++
 include/linux/tty.h  |    1 +
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index 2e50f4d..0f11375 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -48,6 +48,7 @@
 #include <linux/audit.h>
 #include <linux/file.h>
 #include <linux/uaccess.h>
+#include <linux/module.h>
 
 #include <asm/system.h>
 
@@ -2091,3 +2092,11 @@ struct tty_ldisc_ops tty_ldisc_N_TTY = {
 	.receive_buf     = n_tty_receive_buf,
 	.write_wakeup    = n_tty_write_wakeup
 };
+
+void n_tty_inherit_ops(struct tty_ldisc_ops *ops)
+{
+	*ops = tty_ldisc_N_TTY;
+	ops->owner = NULL;
+	ops->refcount = ops->flags = 0;
+}
+EXPORT_SYMBOL_GPL(n_tty_inherit_ops);
diff --git a/include/linux/tty.h b/include/linux/tty.h
index f0f43d0..5091438 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -485,6 +485,7 @@ extern void tty_ldisc_enable(struct tty_struct *tty);
 
 /* n_tty.c */
 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
+extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
 
 /* tty_audit.c */
 #ifdef CONFIG_AUDIT
-- 
1.6.3.3