tty: Extract various bits of ldisc code

[linux-2.6-block.git] / drivers / char / tty_io.c

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 6c817398232e45020a0e52d66c7b399efa94f028..be49d0730bb99b41b5e400ddb1c1454b800a2100 100644 (file)
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -2481,6 +2481,24 @@ static int tty_tiocmset(struct tty_struct *tty, struct file *file, unsigned int
        return tty->ops->tiocmset(tty, file, set, clear);
 }
 
+struct tty_struct *tty_pair_get_tty(struct tty_struct *tty)
+{
+       if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+           tty->driver->subtype == PTY_TYPE_MASTER)
+               tty = tty->link;
+       return tty;
+}
+EXPORT_SYMBOL(tty_pair_get_tty);
+
+struct tty_struct *tty_pair_get_pty(struct tty_struct *tty)
+{
+       if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+           tty->driver->subtype == PTY_TYPE_MASTER)
+           return tty;
+       return tty->link;
+}
+EXPORT_SYMBOL(tty_pair_get_pty);
+
 /*
  * Split this up, as gcc can choke on it otherwise..
  */
@@ -2496,11 +2514,7 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
        if (tty_paranoia_check(tty, inode, "tty_ioctl"))
                return -EINVAL;
 
-       real_tty = tty;
-       if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
-           tty->driver->subtype == PTY_TYPE_MASTER)
-               real_tty = tty->link;
-
+       real_tty = tty_pair_get_tty(tty);
 
        /*
         * Factor out some common prep work