From 9f72cab1596327e1011ab4599c07b165e0fb45db Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Thu, 8 Apr 2021 14:51:32 +0200
Subject: tty: move some tty-only functions to drivers/tty/tty.h

The flow change and restricted_tty_write() logic is internal to the tty
core only, so move it out of the include/linux/tty.h file.

Cc: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20210408125134.3016837-12-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/tty/tty.h       | 17 +++++++++++++++++
 drivers/tty/tty_ioctl.c |  1 +
 2 files changed, 18 insertions(+)

(limited to 'drivers')

diff --git a/drivers/tty/tty.h b/drivers/tty/tty.h
index af997a4174c5..cf0b1346b346 100644
--- a/drivers/tty/tty.h
+++ b/drivers/tty/tty.h
@@ -40,6 +40,21 @@ enum {
 	TTY_LOCK_SLAVE,
 };
 
+/* Values for tty->flow_change */
+#define TTY_THROTTLE_SAFE	1
+#define TTY_UNTHROTTLE_SAFE	2
+
+static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
+{
+	tty->flow_change = val;
+}
+
+static inline void tty_set_flow_change(struct tty_struct *tty, int val)
+{
+	tty->flow_change = val;
+	smp_mb();
+}
+
 int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout);
 void tty_ldisc_unlock(struct tty_struct *tty);
 
@@ -57,4 +72,6 @@ static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
 }
 #endif
 
+ssize_t redirected_tty_write(struct kiocb *, struct iov_iter *);
+
 #endif
diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c
index 420e7678330f..41f7449d0464 100644
--- a/drivers/tty/tty_ioctl.c
+++ b/drivers/tty/tty_ioctl.c
@@ -21,6 +21,7 @@
 #include <linux/bitops.h>
 #include <linux/mutex.h>
 #include <linux/compat.h>
+#include "tty.h"
 
 #include <asm/io.h>
 #include <linux/uaccess.h>
-- 
cgit v1.2.3