tty: add compat_ioctl

Add compat_ioctl method for tty code to allow processing of 32 bit ioctl
calls on 64 bit systems by tty core, tty drivers, and line disciplines.

Based on patch by Arnd Bergmann:
http://www.uwsg.iu.edu/hypermail/linux/kernel/0511.0/1732.html

[akpm@linux-foundation.org: make things static]
Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 16 deletions

diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index 6ac3ca4c723c..b3d4ccc33a47 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -1544,21 +1544,18 @@ static unsigned int normal_poll(struct tty_struct * tty, struct file * file, pol
 }
 
 struct tty_ldisc tty_ldisc_N_TTY = {
-        TTY_LDISC_MAGIC,        /* magic */
-        "n_tty",                /* name */
-        0,                      /* num */
-        0,                      /* flags */
-        n_tty_open,             /* open */
-        n_tty_close,            /* close */
-        n_tty_flush_buffer,     /* flush_buffer */
-        n_tty_chars_in_buffer,  /* chars_in_buffer */
-        read_chan,              /* read */
-        write_chan,             /* write */
-        n_tty_ioctl,            /* ioctl */
-        n_tty_set_termios,      /* set_termios */
-        normal_poll,            /* poll */
-        NULL,                   /* hangup */
-        n_tty_receive_buf,      /* receive_buf */
-        n_tty_write_wakeup      /* write_wakeup */
+        .magic           = TTY_LDISC_MAGIC,
+        .name            = "n_tty",
+        .open            = n_tty_open,
+        .close           = n_tty_close,
+        .flush_buffer    = n_tty_flush_buffer,
+        .chars_in_buffer = n_tty_chars_in_buffer,
+        .read            = read_chan,
+        .write           = write_chan,
+        .ioctl           = n_tty_ioctl,
+        .set_termios     = n_tty_set_termios,
+        .poll            = normal_poll,
+        .receive_buf     = n_tty_receive_buf,
+        .write_wakeup    = n_tty_write_wakeup
 };