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serial: take termios_rwsem for ->rs485_config() & pass termios as param

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To be able to alter ADDRB within ->rs485_config(), take termios_rwsem
before calling ->rs485_config() and pass termios.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220624204210.11112-5-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen 2022-06-24 23:42:08 +03:00 committed by Greg Kroah-Hartman
parent 79b3e69fa4
commit ae50bb2752
19 changed files with 38 additions and 25 deletions
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3
drivers/tty/serial/8250/8250.h
View File

@ -203,7 +203,8 @@ void serial8250_rpm_put(struct uart_8250_port *p);
void serial8250_rpm_get_tx(struct uart_8250_port *p);
void serial8250_rpm_put_tx(struct uart_8250_port *p);
int serial8250_em485_config(struct uart_port *port, struct serial_rs485 *rs485);
int serial8250_em485_config(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485);
void serial8250_em485_start_tx(struct uart_8250_port *p);
void serial8250_em485_stop_tx(struct uart_8250_port *p);
void serial8250_em485_destroy(struct uart_8250_port *p);

3
drivers/tty/serial/8250/8250_dwlib.c
View File

@ -85,7 +85,8 @@ void dw8250_do_set_termios(struct uart_port *p, struct ktermios *termios, struct
}
EXPORT_SYMBOL_GPL(dw8250_do_set_termios);
static int dw8250_rs485_config(struct uart_port *p, struct serial_rs485 *rs485)
static int dw8250_rs485_config(struct uart_port *p, struct ktermios *termios,
struct serial_rs485 *rs485)
{
u32 tcr;

9
drivers/tty/serial/8250/8250_exar.c
View File

@ -112,7 +112,8 @@
struct exar8250;
struct exar8250_platform {
int (*rs485_config)(struct uart_port *, struct serial_rs485 *);
int (*rs485_config)(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485);
const struct serial_rs485 *rs485_supported;
int (*register_gpio)(struct pci_dev *, struct uart_8250_port *);
void (*unregister_gpio)(struct uart_8250_port *);
@ -409,7 +410,7 @@ static void xr17v35x_unregister_gpio(struct uart_8250_port *port)
port->port.private_data = NULL;
}
static int generic_rs485_config(struct uart_port *port,
static int generic_rs485_config(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
bool is_rs485 = !!(rs485->flags & SER_RS485_ENABLED);
@ -441,7 +442,7 @@ static const struct exar8250_platform exar8250_default_platform = {
.rs485_supported = &generic_rs485_supported,
};
static int iot2040_rs485_config(struct uart_port *port,
static int iot2040_rs485_config(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
bool is_rs485 = !!(rs485->flags & SER_RS485_ENABLED);
@ -471,7 +472,7 @@ static int iot2040_rs485_config(struct uart_port *port,
value |= mode;
writeb(value, p + UART_EXAR_MPIOLVL_7_0);
return generic_rs485_config(port, rs485);
return generic_rs485_config(port, termios, rs485);
}
static const struct serial_rs485 iot2040_rs485_supported = {

2
drivers/tty/serial/8250/8250_fintek.c
View File

@ -191,7 +191,7 @@ static int fintek_8250_get_ldn_range(struct fintek_8250 *pdata, int *min,
return -ENODEV;
}
static int fintek_8250_rs485_config(struct uart_port *port,
static int fintek_8250_rs485_config(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
uint8_t config = 0;

2
drivers/tty/serial/8250/8250_lpc18xx.c
View File

@ -32,7 +32,7 @@ struct lpc18xx_uart_data {
int line;
};
static int lpc18xx_rs485_config(struct uart_port *port,
static int lpc18xx_rs485_config(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
struct uart_8250_port *up = up_to_u8250p(port);

2
drivers/tty/serial/8250/8250_pci.c
View File

@ -1553,7 +1553,7 @@ pci_brcm_trumanage_setup(struct serial_private *priv,
#define FINTEK_RTS_INVERT BIT(5)
/* We should do proper H/W transceiver setting before change to RS485 mode */
static int pci_fintek_rs485_config(struct uart_port *port,
static int pci_fintek_rs485_config(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
struct pci_dev *pci_dev = to_pci_dev(port->dev);

3
drivers/tty/serial/8250/8250_port.c
View File

@ -664,7 +664,8 @@ EXPORT_SYMBOL_GPL(serial8250_em485_supported);
* if the uart is incapable of driving RTS as a Transmit Enable signal in
* hardware, relying on software emulation instead.
*/
int serial8250_em485_config(struct uart_port *port, struct serial_rs485 *rs485)
int serial8250_em485_config(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
struct uart_8250_port *up = up_to_u8250p(port);

2
drivers/tty/serial/amba-pl011.c
View File

@ -2197,7 +2197,7 @@ static int pl011_verify_port(struct uart_port *port, struct serial_struct *ser)
return ret;
}
static int pl011_rs485_config(struct uart_port *port,
static int pl011_rs485_config(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
struct uart_amba_port *uap =

2
drivers/tty/serial/ar933x_uart.c
View File

@ -580,7 +580,7 @@ static const struct uart_ops ar933x_uart_ops = {
.verify_port = ar933x_uart_verify_port,
};
static int ar933x_config_rs485(struct uart_port *port,
static int ar933x_config_rs485(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485conf)
{
struct ar933x_uart_port *up =

2
drivers/tty/serial/atmel_serial.c
View File

@ -283,7 +283,7 @@ static void atmel_tasklet_schedule(struct atmel_uart_port *atmel_port,
}
/* Enable or disable the rs485 support */
static int atmel_config_rs485(struct uart_port *port,
static int atmel_config_rs485(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485conf)
{
struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);

4
drivers/tty/serial/fsl_lpuart.c
View File

@ -1355,7 +1355,7 @@ static void lpuart_dma_rx_free(struct uart_port *port)
sport->dma_rx_cookie = -EINVAL;
}
static int lpuart_config_rs485(struct uart_port *port,
static int lpuart_config_rs485(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
struct lpuart_port *sport = container_of(port,
@ -1385,7 +1385,7 @@ static int lpuart_config_rs485(struct uart_port *port,
return 0;
}
static int lpuart32_config_rs485(struct uart_port *port,
static int lpuart32_config_rs485(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
struct lpuart_port *sport = container_of(port,

2
drivers/tty/serial/imx.c
View File

@ -1907,7 +1907,7 @@ static void imx_uart_poll_put_char(struct uart_port *port, unsigned char c)
#endif
/* called with port.lock taken and irqs off or from .probe without locking */
static int imx_uart_rs485_config(struct uart_port *port,
static int imx_uart_rs485_config(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485conf)
{
struct imx_port *sport = (struct imx_port *)port;

2
drivers/tty/serial/max310x.c
View File

@ -1036,7 +1036,7 @@ static void max310x_rs_proc(struct work_struct *ws)
MAX310X_MODE2_ECHOSUPR_BIT, mode2);
}
static int max310x_rs485_config(struct uart_port *port,
static int max310x_rs485_config(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
struct max310x_one *one = to_max310x_port(port);

3
drivers/tty/serial/mcf.c
View File

@ -431,7 +431,8 @@ static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser)
/****************************************************************************/
/* Enable or disable the RS485 support */
static int mcf_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
static int mcf_config_rs485(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
unsigned char mr1, mr2;

3
drivers/tty/serial/omap-serial.c
View File

@ -1324,7 +1324,8 @@ static inline void serial_omap_add_console_port(struct uart_omap_port *up)
/* Enable or disable the rs485 support */
static int
serial_omap_config_rs485(struct uart_port *port, struct serial_rs485 *rs485)
serial_omap_config_rs485(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
struct uart_omap_port *up = to_uart_omap_port(port);
unsigned int mode;

2
drivers/tty/serial/sc16is7xx.c
View File

@ -1127,7 +1127,7 @@ static void sc16is7xx_set_termios(struct uart_port *port,
spin_unlock_irqrestore(&port->lock, flags);
}
static int sc16is7xx_config_rs485(struct uart_port *port,
static int sc16is7xx_config_rs485(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485)
{
struct sc16is7xx_port *s = dev_get_drvdata(port->dev);

14
drivers/tty/serial/serial_core.c
View File

@ -1353,7 +1353,7 @@ int uart_rs485_config(struct uart_port *port)
uart_sanitize_serial_rs485(port, rs485);
ret = port->rs485_config(port, rs485);
ret = port->rs485_config(port, NULL, rs485);
if (ret)
memset(rs485, 0, sizeof(*rs485));
@ -1377,7 +1377,7 @@ static int uart_get_rs485_config(struct uart_port *port,
return 0;
}
static int uart_set_rs485_config(struct uart_port *port,
static int uart_set_rs485_config(struct tty_struct *tty, struct uart_port *port,
struct serial_rs485 __user *rs485_user)
{
struct serial_rs485 rs485;
@ -1396,7 +1396,7 @@ static int uart_set_rs485_config(struct uart_port *port,
uart_sanitize_serial_rs485(port, &rs485);
spin_lock_irqsave(&port->lock, flags);
ret = port->rs485_config(port, &rs485);
ret = port->rs485_config(port, &tty->termios, &rs485);
if (!ret)
port->rs485 = rs485;
spin_unlock_irqrestore(&port->lock, flags);
@ -1505,6 +1505,10 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
if (ret != -ENOIOCTLCMD)
goto out;
/* rs485_config requires more locking than others */
if (cmd == TIOCGRS485)
down_write(&tty->termios_rwsem);
mutex_lock(&port->mutex);
uport = uart_port_check(state);
@ -1528,7 +1532,7 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
break;
case TIOCSRS485:
ret = uart_set_rs485_config(uport, uarg);
ret = uart_set_rs485_config(tty, uport, uarg);
break;
case TIOCSISO7816:
@ -1545,6 +1549,8 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
}
out_up:
mutex_unlock(&port->mutex);
if (cmd == TIOCGRS485)
up_write(&tty->termios_rwsem);
out:
return ret;
}

2
drivers/tty/serial/stm32-usart.c
View File

@ -97,7 +97,7 @@ static void stm32_usart_config_reg_rs485(u32 *cr1, u32 *cr3, u32 delay_ADE,
*cr1 |= rs485_deat_dedt;
}
static int stm32_usart_config_rs485(struct uart_port *port,
static int stm32_usart_config_rs485(struct uart_port *port, struct ktermios *termios,
struct serial_rs485 *rs485conf)
{
struct stm32_port *stm32_port = to_stm32_port(port);

1
include/linux/serial_core.h
View File

@ -133,6 +133,7 @@ struct uart_port {
unsigned int old);
void (*handle_break)(struct uart_port *);
int (*rs485_config)(struct uart_port *,
struct ktermios *termios,
struct serial_rs485 *rs485);
int (*iso7816_config)(struct uart_port *,
struct serial_iso7816 *iso7816);