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From: Rodolfo Giometti on 23 Feb 2010 07:50
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(a)linux.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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Prev: [PATCH 6/6] serial amba-pl010: enable PPS support.
Next: ARM: ftrace: allow building without frame pointers