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    Subject[PATCH 5.10 248/530] tty: fix return value for unsupported termiox ioctls
    From: Johan Hovold <>

    [ Upstream commit 8871de06ff78e9333d86c87d7071452b690e7c9b ]

    Drivers should return -ENOTTY ("Inappropriate I/O control operation")
    when an ioctl isn't supported, while -EINVAL is used for invalid

    Support for termiox was added by commit 1d65b4a088de ("tty: Add
    termiox") in 2008 but no driver support ever followed and it was
    recently ripped out by commit e0efb3168d34 ("tty: Remove dead termiox

    Fix the return value for the unsupported termiox ioctls, which have
    always returned -EINVAL, by explicitly returning -ENOTTY rather than
    removing them completely and falling back to the default unrecognised-
    ioctl handling.

    Fixes: 1d65b4a088de ("tty: Add termiox")
    Signed-off-by: Johan Hovold <>
    Signed-off-by: Greg Kroah-Hartman <>
    Signed-off-by: Sasha Levin <>
    drivers/tty/tty_ioctl.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c
    index 4de1c6ddb8ff..803da2d111c8 100644
    --- a/drivers/tty/tty_ioctl.c
    +++ b/drivers/tty/tty_ioctl.c
    @@ -774,8 +774,8 @@ int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
    case TCSETX:
    case TCSETXW:
    case TCSETXF:
    - return -EINVAL;
    + return -ENOTTY;
    copy_termios(real_tty, &kterm);
    ret = put_user((kterm.c_cflag & CLOCAL) ? 1 : 0,

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