tty: More driver operations

We have the lookup operation abstracted which is nice for pty cleanup but
we really want to abstract the add/remove entries as well so that we can
pull the pty code out of the tty core and create a clear defined interface
for the tty driver table.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index 0fdfa0517140..4e6490bda751 100644
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -433,8 +433,22 @@ static void pty_shutdown(struct tty_struct *tty)
         kfree(tty->termios_locked);
 }
 
+/* We have no need to install and remove our tty objects as devpts does all
+   the work for us */
+
+static int pty_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+        return 0;
+}
+
+static void pty_remove(struct tty_driver *driver, struct tty_struct *tty)
+{
+}
+
 static const struct tty_operations ptm_unix98_ops = {
         .lookup = ptm_unix98_lookup,
+        .install = pty_install,
+        .remove = pty_remove,
         .open = pty_open,
         .close = pty_close,
         .write = pty_write,
@@ -449,6 +463,8 @@ static const struct tty_operations ptm_unix98_ops = {
 
 static const struct tty_operations pty_unix98_ops = {
         .lookup = pts_unix98_lookup,
+        .install = pty_install,
+        .remove = pty_remove,
         .open = pty_open,
         .close = pty_close,
         .write = pty_write,