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USB: serial: ftdi_sio: simplify TIOCSSERIAL flag logic 

Simplify TIOCSSERIAL flag logic somewhat.

Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-06-06 12:54:34 +02:00 committed by Greg Kroah-Hartman
parent dc2f727159
commit f3e8ae657e
1 changed files with 5 additions and 8 deletions
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13
drivers/usb/serial/ftdi_sio.c
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@ -1505,8 +1505,7 @@ static int set_serial_info(struct tty_struct *tty,
/* Do error checking and permission checking */
if (!capable(CAP_SYS_ADMIN)) {
if (((new_serial.flags & ~ASYNC_USR_MASK) !=
(priv->flags & ~ASYNC_USR_MASK))) {
if ((new_serial.flags ^ priv->flags) & ~ASYNC_USR_MASK) {
mutex_unlock(&priv->cfg_lock);
return -EPERM;
}
@ -1530,8 +1529,7 @@ static int set_serial_info(struct tty_struct *tty,
check_and_exit:
write_latency_timer(port);
if ((old_priv.flags & ASYNC_SPD_MASK) !=
(priv->flags & ASYNC_SPD_MASK)) {
if ((priv->flags ^ old_priv.flags) & ASYNC_SPD_MASK) {
if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
tty->alt_speed = 57600;
else if ((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
@ -1543,10 +1541,9 @@ check_and_exit:
else
tty->alt_speed = 0;
}
if (((old_priv.flags & ASYNC_SPD_MASK) !=
(priv->flags & ASYNC_SPD_MASK)) ||
(((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) &&
(old_priv.custom_divisor != priv->custom_divisor))) {
if ((priv->flags ^ old_priv.flags) & ASYNC_SPD_MASK ||
((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
priv->custom_divisor != old_priv.custom_divisor)) {
change_speed(tty, port);
mutex_unlock(&priv->cfg_lock);
}