ttyprintk: Removed unnecessary TTY ioctl callback

It turns-out, that TIOCCONS is completely handled in tty_io.c, so
the current local ioctl callback is of no real use.
Signed-off-by: Samo Pogačnik <samo_pogacnik@t-2.net>
Link: https://lore.kernel.org/r/1502946c760b1aae3ad9cffcf4ea3b9f37206585.camel@t-2.netSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/char/ttyprintk.c

@@ -109,7 +109,6 @@ static int tpk_write(struct tty_struct *tty,
 	unsigned long flags;
 	int ret;
 
-
 	/* exclusive use of tpk_printk within this tty */
 	spin_lock_irqsave(&tpkp->spinlock, flags);
 	ret = tpk_printk(buf, count);
@@ -126,27 +125,6 @@ static unsigned int tpk_write_room(struct tty_struct *tty)
 	return TPK_MAX_ROOM;
 }
 
-/*
- * TTY operations ioctl function.
- */
-static int tpk_ioctl(struct tty_struct *tty,
-			unsigned int cmd, unsigned long arg)
-{
-	struct ttyprintk_port *tpkp = tty->driver_data;
-
-	if (!tpkp)
-		return -EINVAL;
-
-	switch (cmd) {
-	/* Stop TIOCCONS */
-	case TIOCCONS:
-		return -EOPNOTSUPP;
-	default:
-		return -ENOIOCTLCMD;
-	}
-	return 0;
-}
-
 /*
  * TTY operations hangup function.
  */
@@ -176,7 +154,6 @@ static const struct tty_operations ttyprintk_ops = {
 	.close = tpk_close,
 	.write = tpk_write,
 	.write_room = tpk_write_room,
-	.ioctl = tpk_ioctl,
 	.hangup = tpk_hangup,
 };