tty: hide unused pty_get_peer function

TIOCGPTPEER is only used for unix98 PTYs, and we get a warning
when those are disabled:

drivers/tty/pty.c:466:12: error: 'pty_get_peer' defined but not used [-Werror=unused-function]

This moves the respective functions inside of the existing #ifdef.

Fixes: 54ebbfb16034 ("tty: add TIOCGPTPEER ioctl")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Aleksa Sarai <asarai@suse.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index d1399aac05a17e96ead10d5bd616a5a780ce9237..284749fb0f6b96d3d6d667332e569ba0d745e048 100644 (file)
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -448,48 +448,6 @@ err:
        return retval;
 }
 
-/**
- *     pty_open_peer - open the peer of a pty
- *     @tty: the peer of the pty being opened
- *
- *     Open the cached dentry in tty->link, providing a safe way for userspace
- *     to get the slave end of a pty (where they have the master fd and cannot
- *     access or trust the mount namespace /dev/pts was mounted inside).
- */
-static struct file *pty_open_peer(struct tty_struct *tty, int flags)
-{
-       if (tty->driver->subtype != PTY_TYPE_MASTER)
-               return ERR_PTR(-EIO);
-       return dentry_open(tty->link->driver_data, flags, current_cred());
-}
-
-static int pty_get_peer(struct tty_struct *tty, int flags)
-{
-       int fd = -1;
-       struct file *filp = NULL;
-       int retval = -EINVAL;
-
-       fd = get_unused_fd_flags(0);
-       if (fd < 0) {
-               retval = fd;
-               goto err;
-       }
-
-       filp = pty_open_peer(tty, flags);
-       if (IS_ERR(filp)) {
-               retval = PTR_ERR(filp);
-               goto err_put;
-       }
-
-       fd_install(fd, filp);
-       return fd;
-
-err_put:
-       put_unused_fd(fd);
-err:
-       return retval;
-}
-
 static void pty_cleanup(struct tty_struct *tty)
 {
        tty_port_put(tty->port);
@@ -646,9 +604,50 @@ static inline void legacy_pty_init(void) { }
 
 /* Unix98 devices */
 #ifdef CONFIG_UNIX98_PTYS
-
 static struct cdev ptmx_cdev;
 
+/**
+ *     pty_open_peer - open the peer of a pty
+ *     @tty: the peer of the pty being opened
+ *
+ *     Open the cached dentry in tty->link, providing a safe way for userspace
+ *     to get the slave end of a pty (where they have the master fd and cannot
+ *     access or trust the mount namespace /dev/pts was mounted inside).
+ */
+static struct file *pty_open_peer(struct tty_struct *tty, int flags)
+{
+       if (tty->driver->subtype != PTY_TYPE_MASTER)
+               return ERR_PTR(-EIO);
+       return dentry_open(tty->link->driver_data, flags, current_cred());
+}
+
+static int pty_get_peer(struct tty_struct *tty, int flags)
+{
+       int fd = -1;
+       struct file *filp = NULL;
+       int retval = -EINVAL;
+
+       fd = get_unused_fd_flags(0);
+       if (fd < 0) {
+               retval = fd;
+               goto err;
+       }
+
+       filp = pty_open_peer(tty, flags);
+       if (IS_ERR(filp)) {
+               retval = PTR_ERR(filp);
+               goto err_put;
+       }
+
+       fd_install(fd, filp);
+       return fd;
+
+err_put:
+       put_unused_fd(fd);
+err:
+       return retval;
+}
+
 static int pty_unix98_ioctl(struct tty_struct *tty,
                            unsigned int cmd, unsigned long arg)
 {