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Subject[PATCH 02/14] tty: serial - fix tty back references in termios
Date
One or two drivers go poking back into the tty from the termios setting
routine in unsafe ways. We don't need to pass the tty down because the
[ab]users are just using it to get at things they can get at anyway.

This leaves low_latency setting to sort out along with set_ldisc use.

Signed-off-by: Alan Cox <alan@linux.intel.com>
---
drivers/serial/21285.c | 10 +++-------
drivers/serial/imx.c | 10 ++++------
drivers/serial/ioc3_serial.c | 9 +++++----
drivers/serial/ioc4_serial.c | 9 +++++----
drivers/serial/max3100.c | 3 +--
5 files changed, 18 insertions(+), 23 deletions(-)

diff --git a/drivers/serial/21285.c b/drivers/serial/21285.c
index 8681f13..d89aa38 100644
--- a/drivers/serial/21285.c
+++ b/drivers/serial/21285.c
@@ -216,7 +216,7 @@ serial21285_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
unsigned long flags;
- unsigned int baud, quot, h_lcr;
+ unsigned int baud, quot, h_lcr, b;

/*
* We don't support modem control lines.
@@ -234,12 +234,8 @@ serial21285_set_termios(struct uart_port *port, struct ktermios *termios,
*/
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
quot = uart_get_divisor(port, baud);
-
- if (port->state && port->state->port.tty) {
- struct tty_struct *tty = port->state->port.tty;
- unsigned int b = port->uartclk / (16 * quot);
- tty_encode_baud_rate(tty, b, b);
- }
+ b = port->uartclk / (16 * quot);
+ tty_termios_encode_baud_rate(termios, b, b);

switch (termios->c_cflag & CSIZE) {
case CS5:
diff --git a/drivers/serial/imx.c b/drivers/serial/imx.c
index 4315b23..9504b44 100644
--- a/drivers/serial/imx.c
+++ b/drivers/serial/imx.c
@@ -901,13 +901,11 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios,
rational_best_approximation(16 * div * baud, sport->port.uartclk,
1 << 16, 1 << 16, &num, &denom);

- if (port->state && port->state->port.tty) {
- tdiv64 = sport->port.uartclk;
- tdiv64 *= num;
- do_div(tdiv64, denom * 16 * div);
- tty_encode_baud_rate(sport->port.state->port.tty,
+ tdiv64 = sport->port.uartclk;
+ tdiv64 *= num;
+ do_div(tdiv64, denom * 16 * div);
+ tty_termios_encode_baud_rate(termios,
(speed_t)tdiv64, (speed_t)tdiv64);
- }

num -= 1;
denom -= 1;
diff --git a/drivers/serial/ioc3_serial.c b/drivers/serial/ioc3_serial.c
index f164ba4..bd2e9e6 100644
--- a/drivers/serial/ioc3_serial.c
+++ b/drivers/serial/ioc3_serial.c
@@ -954,12 +954,13 @@ ioc3_change_speed(struct uart_port *the_port,
struct ktermios *new_termios, struct ktermios *old_termios)
{
struct ioc3_port *port = get_ioc3_port(the_port);
- unsigned int cflag;
+ unsigned int cflag, iflag;
int baud;
int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8;
struct uart_state *state = the_port->state;

cflag = new_termios->c_cflag;
+ iflag = new_termios->c_iflag;

switch (cflag & CSIZE) {
case CS5:
@@ -1000,12 +1001,12 @@ ioc3_change_speed(struct uart_port *the_port,

state->port.tty->low_latency = 1;

- if (I_IGNPAR(state->port.tty))
+ if (iflag & IGNPAR))
the_port->ignore_status_mask &= ~(N_PARITY_ERROR
| N_FRAMING_ERROR);
- if (I_IGNBRK(state->port.tty)) {
+ if (iflag & IGNBRK) {
the_port->ignore_status_mask &= ~N_BREAK;
- if (I_IGNPAR(state->port.tty))
+ if (iflag & IGNPAR)
the_port->ignore_status_mask &= ~N_OVERRUN_ERROR;
}
if (!(cflag & CREAD)) {
diff --git a/drivers/serial/ioc4_serial.c b/drivers/serial/ioc4_serial.c
index 8ad28fc..2c30023 100644
--- a/drivers/serial/ioc4_serial.c
+++ b/drivers/serial/ioc4_serial.c
@@ -1685,11 +1685,12 @@ ioc4_change_speed(struct uart_port *the_port,
{
struct ioc4_port *port = get_ioc4_port(the_port, 0);
int baud, bits;
- unsigned cflag;
+ unsigned cflag, iflag;
int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8;
struct uart_state *state = the_port->state;

cflag = new_termios->c_cflag;
+ iflag = new_termios->c_iflag;

switch (cflag & CSIZE) {
case CS5:
@@ -1741,12 +1742,12 @@ ioc4_change_speed(struct uart_port *the_port,

state->port.tty->low_latency = 1;

- if (I_IGNPAR(state->port.tty))
+ if (iflag & IGNPAR)
the_port->ignore_status_mask &= ~(N_PARITY_ERROR
| N_FRAMING_ERROR);
- if (I_IGNBRK(state->port.tty)) {
+ if (iflag & IGNBRK) {
the_port->ignore_status_mask &= ~N_BREAK;
- if (I_IGNPAR(state->port.tty))
+ if (iflag & IGNPAR))
the_port->ignore_status_mask &= ~N_OVERRUN_ERROR;
}
if (!(cflag & CREAD)) {
diff --git a/drivers/serial/max3100.c b/drivers/serial/max3100.c
index 3351c3b..dfcabfe 100644
--- a/drivers/serial/max3100.c
+++ b/drivers/serial/max3100.c
@@ -430,7 +430,6 @@ max3100_set_termios(struct uart_port *port, struct ktermios *termios,
int baud = 0;
unsigned cflag;
u32 param_new, param_mask, parity = 0;
- struct tty_struct *tty = s->port.state->port.tty;

dev_dbg(&s->spi->dev, "%s\n", __func__);
if (!tty)
@@ -485,7 +484,7 @@ max3100_set_termios(struct uart_port *port, struct ktermios *termios,
default:
baud = s->baud;
}
- tty_encode_baud_rate(tty, baud, baud);
+ tty_termios_encode_baud_rate(termios, baud, baud);
s->baud = baud;
param_mask |= MAX3100_BAUD;



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