linux-kernel - [PATCH 3/6] ldisc n_tty: add new method n_tty_inherit

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Date:	Tue, 23 Feb 2010 13:40:32 +0100
From:	Rodolfo Giometti <giometti@...ux.it>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Dave Jones <davej@...hat.com>, Sam Ravnborg <sam@...nborg.org>,
	Greg KH <greg@...ah.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Kay Sievers <kay.sievers@...y.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Christoph Hellwig <hch@...radead.org>,
	Alexander Gordeev <lasaine@....cs.msu.su>,
	Rodolfo Giometti <giometti@...ux.it>
Subject: [PATCH 3/6] ldisc n_tty: add new method n_tty_inherit_ops()

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@...ux.it>
---
 drivers/char/n_tty.c |   17 +++++++++++++++++
 include/linux/tty.h  |    1 +
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index 2e50f4d..bdae832 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 +2092,19 @@ struct tty_ldisc_ops tty_ldisc_N_TTY = {
 	.receive_buf     = n_tty_receive_buf,
 	.write_wakeup    = n_tty_write_wakeup
 };
+
+/**
+ *	n_tty_inherit_ops	-	inherit N_TTY methods
+ *	@ops: struct tty_ldisc_ops where to save N_TTY methods
+ *
+ *	Used by a generic struct tty_ldisc_ops to easily inherit N_TTY
+ *	methods.
+ */
+
+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 6abfcf5..d6cc652 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -504,6 +504,7 @@ 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

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