TIOCSSERIAL is a horrid, underspecified, legacy interface which for most serial devices is only useful for setting the close_delay and closing_wait parameters.
A non-privileged user has only ever been able to set the since long deprecated ASYNC_SPD flags and trying to change any other *supported* feature should result in -EPERM being returned. Setting the current values for any supported features should return success.
Fix the moxa implementation which was returning -EPERM also for a privileged user when trying to change certain unsupported parameters and instead return success consistently.
Signed-off-by: Johan Hovold johan@kernel.org --- drivers/tty/moxa.c | 5 ----- 1 file changed, 5 deletions(-)
diff --git a/drivers/tty/moxa.c b/drivers/tty/moxa.c index 63e440d900ff..4d4f15b5cd29 100644 --- a/drivers/tty/moxa.c +++ b/drivers/tty/moxa.c @@ -2055,11 +2055,6 @@ static int moxa_set_serial_info(struct tty_struct *tty, if (!info) return -ENODEV;
- if (ss->irq != 0 || ss->port != 0 || - ss->custom_divisor != 0 || - ss->baud_base != 921600) - return -EPERM; - close_delay = msecs_to_jiffies(ss->close_delay * 10);
mutex_lock(&info->port.mutex);