n_tty: Factor packet mode status change for reuse

Factor the packet mode status change from n_tty_flush_buffer
for use by follow-on patch.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 14 insertions, 10 deletions

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 16793eccc6ae..7e7f6514fb53 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -223,6 +223,18 @@ static void reset_buffer_flags(struct tty_struct *tty)
         n_tty_set_room(tty);
 }
 
+static void n_tty_packet_mode_flush(struct tty_struct *tty)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&tty->ctrl_lock, flags);
+        if (tty->link->packet) {
+                tty->ctrl_status |= TIOCPKT_FLUSHREAD;
+                wake_up_interruptible(&tty->link->read_wait);
+        }
+        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+}
+
 /**
  *      n_tty_flush_buffer      -       clean input queue
  *      @tty:   terminal device
@@ -237,19 +249,11 @@ static void reset_buffer_flags(struct tty_struct *tty)
 
 static void n_tty_flush_buffer(struct tty_struct *tty)
 {
-        unsigned long flags;
         /* clear everything and unthrottle the driver */
         reset_buffer_flags(tty);
 
-        if (!tty->link)
-                return;
-
-        spin_lock_irqsave(&tty->ctrl_lock, flags);
-        if (tty->link->packet) {
-                tty->ctrl_status |= TIOCPKT_FLUSHREAD;
-                wake_up_interruptible(&tty->link->read_wait);
-        }
-        spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+        if (tty->link)
+                n_tty_packet_mode_flush(tty);
 }
 
 /**