Revert "TTY: pty, remove superfluous ptm test"

This reverts commit 39a43af78472d32c096c85378216e1e24a8464c7.

Sasha reported that this causes problems, so revert it.

Cc: Alan Cox <alan@linux.intel.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index ddec9f3c33962d2a57c30a05ba7af9e3aa10a19f..d505837b34782fa44aa9db5965aa84682945886c 100644 (file)
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -54,7 +54,10 @@ static void pty_close(struct tty_struct *tty, struct file *filp)
        wake_up_interruptible(&tty->link->write_wait);
        if (tty->driver->subtype == PTY_TYPE_MASTER) {
                set_bit(TTY_OTHER_CLOSED, &tty->flags);
-               devpts_pty_kill(tty->link);
+#ifdef CONFIG_UNIX98_PTYS
+               if (tty->driver == ptm_driver)
+                       devpts_pty_kill(tty->link);
+#endif
                tty_unlock();
                tty_vhangup(tty->link);
                tty_lock();