drivers:tty:fix up ENOIOCTLCMD error handling

At commit 07d106d0, Linus pointed out that ENOIOCTLCMD should be
translated as ENOTTY to user mode.
For example:
	fd = open("/dev/tty", O_RDWR);
	ioctl(fd, -1, &argp);

then the errno should be ENOTTY but not EINVAL.

Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 41e42f1..d3bf91a 100644 (file)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2774,7 +2774,7 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
        if (ld->ops->ioctl) {
                retval = ld->ops->ioctl(tty, file, cmd, arg);
                if (retval == -ENOIOCTLCMD)
-                       retval = -EINVAL;
+                       retval = -ENOTTY;
        }
        tty_ldisc_deref(ld);
        return retval;