s390/3270: readd tty3270_open

Reintroduce the tty3270_open function which has been removed by
git commit 20cda6f2 "TTY: tty3270, add tty install". Without
the open function in the tty_operations tty_open will return
-ENODEV and the 3270 tty will not work.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/s390/char/tty3270.c b/drivers/s390/char/tty3270.c
index 43ea0593bdb0..964018402b36 100644
--- a/drivers/s390/char/tty3270.c
+++ b/drivers/s390/char/tty3270.c
@@ -926,6 +926,20 @@ static int tty3270_install(struct tty_driver *driver, struct tty_struct *tty)
 }
 
 /*
+ * This routine is called whenever a 3270 tty is opened.
+ */
+static int
+tty3270_open(struct tty_struct *tty, struct file *filp)
+{
+        struct tty3270 *tp = tty->driver_data;
+        struct tty_port *port = &tp->port;
+
+        port->count++;
+        tty_port_tty_set(port, tty);
+        return 0;
+}
+
+/*
  * This routine is called when the 3270 tty is closed. We wait
  * for the remaining request to be completed. Then we clean up.
  */
@@ -1753,6 +1767,7 @@ static long tty3270_compat_ioctl(struct tty_struct *tty,
 static const struct tty_operations tty3270_ops = {
         .install = tty3270_install,
         .cleanup = tty3270_cleanup,
+        .open = tty3270_open,
         .close = tty3270_close,
         .write = tty3270_write,
         .put_char = tty3270_put_char,