Messages in this thread Patch in this message | | | From | Johan Hovold <> | Subject | [PATCH 12/16] tty: moxa: fix TIOCSSERIAL implementation | Date | Wed, 7 Apr 2021 12:23:30 +0200 |
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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); -- 2.26.3
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