[PATCH v2 1/3] USB: serial: return errors from break handling

From: Johan Hovold
Date: Sun Jun 04 2023 - 08:35:09 EST

Start propagating errors to user space when setting the break state
fails.

This will be used by follow-on changes to also report when a driver or
device does not support break control.

Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
drivers/usb/serial/ark3116.c | 7 +++--
drivers/usb/serial/belkin_sa.c | 12 ++++++---
drivers/usb/serial/ch341.c | 37 +++++++++++++++++----------
drivers/usb/serial/cp210x.c | 8 +++---
drivers/usb/serial/digi_acceleport.c | 7 ++---
drivers/usb/serial/f81232.c | 4 ++-
drivers/usb/serial/f81534.c | 4 ++-
drivers/usb/serial/ftdi_sio.c | 10 +++++---
drivers/usb/serial/io_edgeport.c | 6 +++--
drivers/usb/serial/io_ti.c | 9 +++++--
drivers/usb/serial/keyspan.c | 5 +++-
drivers/usb/serial/keyspan_pda.c | 8 ++++--
drivers/usb/serial/mct_u232.c | 6 ++---
drivers/usb/serial/mos7720.c | 9 ++++---
drivers/usb/serial/mos7840.c | 7 ++---
drivers/usb/serial/mxuport.c | 6 ++---
drivers/usb/serial/pl2303.c | 14 ++++++----
drivers/usb/serial/quatech2.c | 8 ++++--
drivers/usb/serial/ti_usb_3410_5052.c | 10 +++++---
drivers/usb/serial/upd78f0730.c | 7 +++--
drivers/usb/serial/usb-serial.c | 2 +-
drivers/usb/serial/usb_debug.c | 13 +++++++---
drivers/usb/serial/whiteheat.c | 7 ++---
drivers/usb/serial/xr_serial.c | 4 +--
include/linux/usb/serial.h | 2 +-
25 files changed, 140 insertions(+), 72 deletions(-)

diff --git a/drivers/usb/serial/ark3116.c b/drivers/usb/serial/ark3116.c
index 9452291f1703..67a07cc007f0 100644
--- a/drivers/usb/serial/ark3116.c
+++ b/drivers/usb/serial/ark3116.c
@@ -433,10 +433,11 @@ static int ark3116_tiocmset(struct tty_struct *tty,
return 0;
}

-static void ark3116_break_ctl(struct tty_struct *tty, int break_state)
+static int ark3116_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct ark3116_private *priv = usb_get_serial_port_data(port);
+ int ret;

/* LCR is also used for other things: protect access */
mutex_lock(&priv->hw_lock);
@@ -446,9 +447,11 @@ static void ark3116_break_ctl(struct tty_struct *tty, int break_state)
else
priv->lcr &= ~UART_LCR_SBC;

- ark3116_write_reg(port->serial, UART_LCR, priv->lcr);
+ ret = ark3116_write_reg(port->serial, UART_LCR, priv->lcr);

mutex_unlock(&priv->hw_lock);
+
+ return ret;
}

static void ark3116_update_msr(struct usb_serial_port *port, __u8 msr)
diff --git a/drivers/usb/serial/belkin_sa.c b/drivers/usb/serial/belkin_sa.c
index 9331a562dac0..cf47ee4ae5d3 100644
--- a/drivers/usb/serial/belkin_sa.c
+++ b/drivers/usb/serial/belkin_sa.c
@@ -46,7 +46,7 @@ static void belkin_sa_process_read_urb(struct urb *urb);
static void belkin_sa_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
const struct ktermios *old_termios);
-static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state);
+static int belkin_sa_break_ctl(struct tty_struct *tty, int break_state);
static int belkin_sa_tiocmget(struct tty_struct *tty);
static int belkin_sa_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
@@ -399,13 +399,19 @@ static void belkin_sa_set_termios(struct tty_struct *tty,
spin_unlock_irqrestore(&priv->lock, flags);
}

-static void belkin_sa_break_ctl(struct tty_struct *tty, int break_state)
+static int belkin_sa_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
+ int ret;

- if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
+ ret = BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0);
+ if (ret < 0) {
dev_err(&port->dev, "Set break_ctl %d\n", break_state);
+ return ret;
+ }
+
+ return 0;
}

static int belkin_sa_tiocmget(struct tty_struct *tty)
diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index 6e1b87e67304..612bea504d7a 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -562,12 +562,12 @@ static void ch341_set_termios(struct tty_struct *tty,
* TCSBRKP. Due to how the simulation is implemented the duration can't be
* controlled. The duration is always about (1s / 46bd * 9bit) = 196ms.
*/
-static void ch341_simulate_break(struct tty_struct *tty, int break_state)
+static int ch341_simulate_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct ch341_private *priv = usb_get_serial_port_data(port);
unsigned long now, delay;
- int r;
+ int r, r2;

if (break_state != 0) {
dev_dbg(&port->dev, "enter break state requested\n");
@@ -599,7 +599,7 @@ static void ch341_simulate_break(struct tty_struct *tty, int break_state)
*/
priv->break_end = jiffies + (11 * HZ / CH341_MIN_BPS);

- return;
+ return 0;
}

dev_dbg(&port->dev, "leave break state requested\n");
@@ -615,17 +615,22 @@ static void ch341_simulate_break(struct tty_struct *tty, int break_state)
schedule_timeout_interruptible(delay);
}

+ r = 0;
restore:
/* Restore original baud rate */
- r = ch341_set_baudrate_lcr(port->serial->dev, priv, priv->baud_rate,
- priv->lcr);
- if (r < 0)
+ r2 = ch341_set_baudrate_lcr(port->serial->dev, priv, priv->baud_rate,
+ priv->lcr);
+ if (r2 < 0) {
dev_err(&port->dev,
"restoring original baud rate of %u failed: %d\n",
- priv->baud_rate, r);
+ priv->baud_rate, r2);
+ return r2;
+ }
+
+ return r;
}

-static void ch341_break_ctl(struct tty_struct *tty, int break_state)
+static int ch341_break_ctl(struct tty_struct *tty, int break_state)
{
const uint16_t ch341_break_reg =
((uint16_t) CH341_REG_LCR << 8) | CH341_REG_BREAK;
@@ -635,17 +640,17 @@ static void ch341_break_ctl(struct tty_struct *tty, int break_state)
uint16_t reg_contents;
uint8_t break_reg[2];

- if (priv->quirks & CH341_QUIRK_SIMULATE_BREAK) {
- ch341_simulate_break(tty, break_state);
- return;
- }
+ if (priv->quirks & CH341_QUIRK_SIMULATE_BREAK)
+ return ch341_simulate_break(tty, break_state);

r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG,
ch341_break_reg, 0, break_reg, 2);
if (r) {
dev_err(&port->dev, "%s - USB control read error (%d)\n",
__func__, r);
- return;
+ if (r > 0)
+ r = -EIO;
+ return r;
}
dev_dbg(&port->dev, "%s - initial ch341 break register contents - reg1: %x, reg2: %x\n",
__func__, break_reg[0], break_reg[1]);
@@ -663,9 +668,13 @@ static void ch341_break_ctl(struct tty_struct *tty, int break_state)
reg_contents = get_unaligned_le16(break_reg);
r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG,
ch341_break_reg, reg_contents);
- if (r < 0)
+ if (r < 0) {
dev_err(&port->dev, "%s - USB control write error (%d)\n",
__func__, r);
+ return r;
+ }
+
+ return 0;
}

static int ch341_tiocmset(struct tty_struct *tty,
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index cdea1bff3b70..81e49ed9d147 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -39,7 +39,7 @@ static int cp210x_tiocmget(struct tty_struct *);
static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int);
static int cp210x_tiocmset_port(struct usb_serial_port *port,
unsigned int, unsigned int);
-static void cp210x_break_ctl(struct tty_struct *, int);
+static int cp210x_break_ctl(struct tty_struct *, int);
static int cp210x_attach(struct usb_serial *);
static void cp210x_disconnect(struct usb_serial *);
static void cp210x_release(struct usb_serial *);
@@ -1434,7 +1434,7 @@ static int cp210x_tiocmget(struct tty_struct *tty)
return result;
}

-static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
+static int cp210x_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
u16 state;
@@ -1443,9 +1443,11 @@ static void cp210x_break_ctl(struct tty_struct *tty, int break_state)
state = BREAK_OFF;
else
state = BREAK_ON;
+
dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
state == BREAK_OFF ? "off" : "on");
- cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
+
+ return cp210x_write_u16_reg(port, CP210X_SET_BREAK, state);
}

#ifdef CONFIG_GPIOLIB
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index 45d688e9b93f..d1dea3850576 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -217,7 +217,7 @@ static void digi_rx_unthrottle(struct tty_struct *tty);
static void digi_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
const struct ktermios *old_termios);
-static void digi_break_ctl(struct tty_struct *tty, int break_state);
+static int digi_break_ctl(struct tty_struct *tty, int break_state);
static int digi_tiocmget(struct tty_struct *tty);
static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
unsigned int clear);
@@ -839,7 +839,7 @@ static void digi_set_termios(struct tty_struct *tty,
}


-static void digi_break_ctl(struct tty_struct *tty, int break_state)
+static int digi_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
unsigned char buf[4];
@@ -848,7 +848,8 @@ static void digi_break_ctl(struct tty_struct *tty, int break_state)
buf[1] = 2; /* length */
buf[2] = break_state ? 1 : 0;
buf[3] = 0; /* pad */
- digi_write_inb_command(port, buf, 4, 0);
+
+ return digi_write_inb_command(port, buf, 4, 0);
}


diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
index 891fb1fe69df..5f7a46bcace6 100644
--- a/drivers/usb/serial/f81232.c
+++ b/drivers/usb/serial/f81232.c
@@ -448,7 +448,7 @@ static void f81534a_process_read_urb(struct urb *urb)
tty_flip_buffer_push(&port->port);
}

-static void f81232_break_ctl(struct tty_struct *tty, int break_state)
+static int f81232_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct f81232_private *priv = usb_get_serial_port_data(port);
@@ -467,6 +467,8 @@ static void f81232_break_ctl(struct tty_struct *tty, int break_state)
dev_err(&port->dev, "set break failed: %d\n", status);

mutex_unlock(&priv->lock);
+
+ return status;
}

static int f81232_find_clk(speed_t baudrate)
diff --git a/drivers/usb/serial/f81534.c b/drivers/usb/serial/f81534.c
index 4083ae961be4..ef126cd3d94f 100644
--- a/drivers/usb/serial/f81534.c
+++ b/drivers/usb/serial/f81534.c
@@ -656,7 +656,7 @@ static int f81534_set_port_config(struct usb_serial_port *port,
return status;
}

-static void f81534_break_ctl(struct tty_struct *tty, int break_state)
+static int f81534_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
@@ -675,6 +675,8 @@ static void f81534_break_ctl(struct tty_struct *tty, int break_state)
dev_err(&port->dev, "set break failed: %d\n", status);

mutex_unlock(&port_priv->lcr_mutex);
+
+ return status;
}

static int f81534_update_mctrl(struct usb_serial_port *port, unsigned int set,
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 05e28a5ce42b..1bf23611be12 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2550,11 +2550,12 @@ static void ftdi_process_read_urb(struct urb *urb)
tty_flip_buffer_push(&port->port);
}

-static void ftdi_break_ctl(struct tty_struct *tty, int break_state)
+static int ftdi_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct ftdi_private *priv = usb_get_serial_port_data(port);
u16 value;
+ int ret;

/* break_state = -1 to turn on break, and 0 to turn off break */
/* see drivers/char/tty_io.c to see it used */
@@ -2565,19 +2566,22 @@ static void ftdi_break_ctl(struct tty_struct *tty, int break_state)
else
value = priv->last_set_data_value;

- if (usb_control_msg(port->serial->dev,
+ ret = usb_control_msg(port->serial->dev,
usb_sndctrlpipe(port->serial->dev, 0),
FTDI_SIO_SET_DATA_REQUEST,
FTDI_SIO_SET_DATA_REQUEST_TYPE,
value, priv->channel,
- NULL, 0, WDR_TIMEOUT) < 0) {
+ NULL, 0, WDR_TIMEOUT);
+ if (ret < 0) {
dev_err(&port->dev, "%s FAILED to enable/disable break state (state was %d)\n",
__func__, break_state);
+ return ret;
}

dev_dbg(&port->dev, "%s break state is %d - urb is %d\n", __func__,
break_state, value);

+ return 0;
}

static bool ftdi_tx_empty(struct usb_serial_port *port)
diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index 3a4c0febf335..abe4bbb0ac65 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -1560,12 +1560,12 @@ static int edge_ioctl(struct tty_struct *tty,
* SerialBreak
* this function sends a break to the port
*****************************************************************************/
-static void edge_break(struct tty_struct *tty, int break_state)
+static int edge_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
struct edgeport_serial *edge_serial = usb_get_serial_data(port->serial);
- int status;
+ int status = 0;

if (!edge_serial->is_epic ||
edge_serial->epic_descriptor.Supports.IOSPChase) {
@@ -1597,6 +1597,8 @@ static void edge_break(struct tty_struct *tty, int break_state)
dev_dbg(&port->dev, "%s - error sending break set/clear command.\n",
__func__);
}
+
+ return status;
}


diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index bc3c24ea42c1..7a3a6e539456 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -2421,7 +2421,7 @@ static int edge_tiocmget(struct tty_struct *tty)
return result;
}

-static void edge_break(struct tty_struct *tty, int break_state)
+static int edge_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
@@ -2430,10 +2430,15 @@ static void edge_break(struct tty_struct *tty, int break_state)

if (break_state == -1)
bv = 1; /* On */
+
status = ti_do_config(edge_port, UMPC_SET_CLR_BREAK, bv);
- if (status)
+ if (status) {
dev_dbg(&port->dev, "%s - error %d sending break set/clear command.\n",
__func__, status);
+ return status;
+ }
+
+ return 0;
}

static void edge_heartbeat_schedule(struct edgeport_serial *edge_serial)
diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c
index 2966e0c4941e..93b17e0e05a3 100644
--- a/drivers/usb/serial/keyspan.c
+++ b/drivers/usb/serial/keyspan.c
@@ -599,7 +599,7 @@ struct keyspan_port_private {
#include "keyspan_usa67msg.h"


-static void keyspan_break_ctl(struct tty_struct *tty, int break_state)
+static int keyspan_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct keyspan_port_private *p_priv;
@@ -611,7 +611,10 @@ static void keyspan_break_ctl(struct tty_struct *tty, int break_state)
else
p_priv->break_on = 0;

+ /* FIXME: return errors */
keyspan_send_setup(port, 0);
+
+ return 0;
}


diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c
index 6fd15cd9e1eb..0eef358b314a 100644
--- a/drivers/usb/serial/keyspan_pda.c
+++ b/drivers/usb/serial/keyspan_pda.c
@@ -299,7 +299,7 @@ static speed_t keyspan_pda_setbaud(struct usb_serial *serial, speed_t baud)
return baud;
}

-static void keyspan_pda_break_ctl(struct tty_struct *tty, int break_state)
+static int keyspan_pda_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
@@ -315,9 +315,13 @@ static void keyspan_pda_break_ctl(struct tty_struct *tty, int break_state)
4, /* set break */
USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
value, 0, NULL, 0, 2000);
- if (result < 0)
+ if (result < 0) {
dev_dbg(&port->dev, "%s - error %d from usb_control_msg\n",
__func__, result);
+ return result;
+ }
+
+ return 0;
}

static void keyspan_pda_set_termios(struct tty_struct *tty,
diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index d3852feb81a4..6570c8817a80 100644
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -47,7 +47,7 @@ static void mct_u232_read_int_callback(struct urb *urb);
static void mct_u232_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
const struct ktermios *old_termios);
-static void mct_u232_break_ctl(struct tty_struct *tty, int break_state);
+static int mct_u232_break_ctl(struct tty_struct *tty, int break_state);
static int mct_u232_tiocmget(struct tty_struct *tty);
static int mct_u232_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
@@ -677,7 +677,7 @@ static void mct_u232_set_termios(struct tty_struct *tty,
spin_unlock_irqrestore(&priv->lock, flags);
} /* mct_u232_set_termios */

-static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
+static int mct_u232_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct mct_u232_private *priv = usb_get_serial_port_data(port);
@@ -691,7 +691,7 @@ static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
lcr |= MCT_U232_SET_BREAK;
spin_unlock_irqrestore(&priv->lock, flags);

- mct_u232_set_line_ctrl(port, lcr);
+ return mct_u232_set_line_ctrl(port, lcr);
} /* mct_u232_break_ctl */


diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 1d1f85fabc28..23544074eb1c 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -996,7 +996,7 @@ static void mos7720_close(struct usb_serial_port *port)
mos7720_port->open = 0;
}

-static void mos7720_break(struct tty_struct *tty, int break_state)
+static int mos7720_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
unsigned char data;
@@ -1007,7 +1007,7 @@ static void mos7720_break(struct tty_struct *tty, int break_state)

mos7720_port = usb_get_serial_port_data(port);
if (mos7720_port == NULL)
- return;
+ return -ENODEV;

if (break_state == -1)
data = mos7720_port->shadowLCR | UART_LCR_SBC;
@@ -1015,8 +1015,9 @@ static void mos7720_break(struct tty_struct *tty, int break_state)
data = mos7720_port->shadowLCR & ~UART_LCR_SBC;

mos7720_port->shadowLCR = data;
- write_mos_reg(serial, port->port_number, MOS7720_LCR,
- mos7720_port->shadowLCR);
+
+ return write_mos_reg(serial, port->port_number, MOS7720_LCR,
+ mos7720_port->shadowLCR);
}

/*
diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 73370eaae0ab..8b0308d84270 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -787,7 +787,7 @@ static void mos7840_close(struct usb_serial_port *port)
* mos7840_break
* this function sends a break to the port
*****************************************************************************/
-static void mos7840_break(struct tty_struct *tty, int break_state)
+static int mos7840_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
@@ -801,8 +801,9 @@ static void mos7840_break(struct tty_struct *tty, int break_state)
/* FIXME: no locking on shadowLCR anywhere in driver */
mos7840_port->shadowLCR = data;
dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
- mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
- mos7840_port->shadowLCR);
+
+ return mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
+ mos7840_port->shadowLCR);
}

/*****************************************************************************
diff --git a/drivers/usb/serial/mxuport.c b/drivers/usb/serial/mxuport.c
index faa0eedfe245..1f7bb3e4fcf2 100644
--- a/drivers/usb/serial/mxuport.c
+++ b/drivers/usb/serial/mxuport.c
@@ -1230,7 +1230,7 @@ static void mxuport_close(struct usb_serial_port *port)
}

/* Send a break to the port. */
-static void mxuport_break_ctl(struct tty_struct *tty, int break_state)
+static int mxuport_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
@@ -1244,8 +1244,8 @@ static void mxuport_break_ctl(struct tty_struct *tty, int break_state)
dev_dbg(&port->dev, "%s - clearing break\n", __func__);
}

- mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_BREAK,
- enable, port->port_number);
+ return mxuport_send_ctrl_urb(serial, RQ_VENDOR_SET_BREAK,
+ enable, port->port_number);
}

static int mxuport_resume(struct usb_serial *serial)
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 8949c1891164..d93f5d584557 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -173,7 +173,7 @@ MODULE_DEVICE_TABLE(usb, id_table);
#define PL2303_HXN_FLOWCTRL_RTS_CTS 0x18
#define PL2303_HXN_FLOWCTRL_XON_XOFF 0x0c

-static void pl2303_set_break(struct usb_serial_port *port, bool enable);
+static int pl2303_set_break(struct usb_serial_port *port, bool enable);

enum pl2303_type {
TYPE_H,
@@ -1060,7 +1060,7 @@ static int pl2303_carrier_raised(struct usb_serial_port *port)
return 0;
}

-static void pl2303_set_break(struct usb_serial_port *port, bool enable)
+static int pl2303_set_break(struct usb_serial_port *port, bool enable)
{
struct usb_serial *serial = port->serial;
u16 state;
@@ -1077,15 +1077,19 @@ static void pl2303_set_break(struct usb_serial_port *port, bool enable)
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
0, NULL, 0, 100);
- if (result)
+ if (result) {
dev_err(&port->dev, "error sending break = %d\n", result);
+ return result;
+ }
+
+ return 0;
}

-static void pl2303_break_ctl(struct tty_struct *tty, int state)
+static int pl2303_break_ctl(struct tty_struct *tty, int state)
{
struct usb_serial_port *port = tty->driver_data;

- pl2303_set_break(port, state);
+ return pl2303_set_break(port, state);
}

static void pl2303_update_line_status(struct usb_serial_port *port,
diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c
index fee581409bf6..821f25e52ec2 100644
--- a/drivers/usb/serial/quatech2.c
+++ b/drivers/usb/serial/quatech2.c
@@ -741,7 +741,7 @@ static int qt2_tiocmset(struct tty_struct *tty,
return update_mctrl(port_priv, set, clear);
}

-static void qt2_break_ctl(struct tty_struct *tty, int break_state)
+static int qt2_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct qt2_port_private *port_priv;
@@ -754,10 +754,14 @@ static void qt2_break_ctl(struct tty_struct *tty, int break_state)

status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
val, port_priv->device_port);
- if (status < 0)
+ if (status < 0) {
dev_warn(&port->dev,
"%s - failed to send control message: %i\n", __func__,
status);
+ return status;
+ }
+
+ return 0;
}


diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index b99f78224846..0fba25abf671 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -319,7 +319,7 @@ static void ti_set_termios(struct tty_struct *tty,
static int ti_tiocmget(struct tty_struct *tty);
static int ti_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
-static void ti_break(struct tty_struct *tty, int break_state);
+static int ti_break(struct tty_struct *tty, int break_state);
static void ti_interrupt_callback(struct urb *urb);
static void ti_bulk_in_callback(struct urb *urb);
static void ti_bulk_out_callback(struct urb *urb);
@@ -1071,7 +1071,7 @@ static int ti_tiocmset(struct tty_struct *tty,
}


-static void ti_break(struct tty_struct *tty, int break_state)
+static int ti_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct ti_port *tport = usb_get_serial_port_data(port);
@@ -1083,8 +1083,12 @@ static void ti_break(struct tty_struct *tty, int break_state)
tport->tp_uart_base_addr + TI_UART_OFFSET_LCR,
TI_LCR_BREAK, break_state == -1 ? TI_LCR_BREAK : 0);

- if (status)
+ if (status) {
dev_dbg(&port->dev, "%s - error setting break, %d\n", __func__, status);
+ return status;
+ }
+
+ return 0;
}

static int ti_get_port_from_code(unsigned char code)
diff --git a/drivers/usb/serial/upd78f0730.c b/drivers/usb/serial/upd78f0730.c
index c47439bd90fa..46952182e04f 100644
--- a/drivers/usb/serial/upd78f0730.c
+++ b/drivers/usb/serial/upd78f0730.c
@@ -238,12 +238,13 @@ static int upd78f0730_tiocmset(struct tty_struct *tty,
return res;
}

-static void upd78f0730_break_ctl(struct tty_struct *tty, int break_state)
+static int upd78f0730_break_ctl(struct tty_struct *tty, int break_state)
{
struct upd78f0730_port_private *private;
struct usb_serial_port *port = tty->driver_data;
struct upd78f0730_set_dtr_rts request;
struct device *dev = &port->dev;
+ int res;

private = usb_get_serial_port_data(port);

@@ -258,8 +259,10 @@ static void upd78f0730_break_ctl(struct tty_struct *tty, int break_state)
request.opcode = UPD78F0730_CMD_SET_DTR_RTS;
request.params = private->line_signals;

- upd78f0730_send_ctl(port, &request, sizeof(request));
+ res = upd78f0730_send_ctl(port, &request, sizeof(request));
mutex_unlock(&private->lock);
+
+ return res;
}

static void upd78f0730_dtr_rts(struct usb_serial_port *port, int on)
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index f8404073558b..470634444af7 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -539,7 +539,7 @@ static int serial_break(struct tty_struct *tty, int break_state)
dev_dbg(&port->dev, "%s\n", __func__);

if (port->serial->type->break_ctl)
- port->serial->type->break_ctl(tty, break_state);
+ return port->serial->type->break_ctl(tty, break_state);

return 0;
}
diff --git a/drivers/usb/serial/usb_debug.c b/drivers/usb/serial/usb_debug.c
index aaf4813e4971..6934970f180d 100644
--- a/drivers/usb/serial/usb_debug.c
+++ b/drivers/usb/serial/usb_debug.c
@@ -47,12 +47,19 @@ MODULE_DEVICE_TABLE(usb, id_table_combined);
/* This HW really does not support a serial break, so one will be
* emulated when ever the break state is set to true.
*/
-static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
+static int usb_debug_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
+ int ret;
+
if (!break_state)
- return;
- usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
+ return 0;
+
+ ret = usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
+ if (ret < 0)
+ return ret;
+
+ return 0;
}

static void usb_debug_process_read_urb(struct urb *urb)
diff --git a/drivers/usb/serial/whiteheat.c b/drivers/usb/serial/whiteheat.c
index 7f82d40753ee..ca48e90a8e81 100644
--- a/drivers/usb/serial/whiteheat.c
+++ b/drivers/usb/serial/whiteheat.c
@@ -87,7 +87,7 @@ static void whiteheat_set_termios(struct tty_struct *tty,
static int whiteheat_tiocmget(struct tty_struct *tty);
static int whiteheat_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
-static void whiteheat_break_ctl(struct tty_struct *tty, int break_state);
+static int whiteheat_break_ctl(struct tty_struct *tty, int break_state);

static struct usb_serial_driver whiteheat_fake_device = {
.driver = {
@@ -449,10 +449,11 @@ static void whiteheat_set_termios(struct tty_struct *tty,
firm_setup_port(tty);
}

-static void whiteheat_break_ctl(struct tty_struct *tty, int break_state)
+static int whiteheat_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
- firm_set_break(port, break_state);
+
+ return firm_set_break(port, break_state);
}


diff --git a/drivers/usb/serial/xr_serial.c b/drivers/usb/serial/xr_serial.c
index fdb0aae546c3..4ec7c5892b84 100644
--- a/drivers/usb/serial/xr_serial.c
+++ b/drivers/usb/serial/xr_serial.c
@@ -503,7 +503,7 @@ static void xr_dtr_rts(struct usb_serial_port *port, int on)
xr_tiocmset_port(port, 0, TIOCM_DTR | TIOCM_RTS);
}

-static void xr_break_ctl(struct tty_struct *tty, int break_state)
+static int xr_break_ctl(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct xr_data *data = usb_get_serial_port_data(port);
@@ -517,7 +517,7 @@ static void xr_break_ctl(struct tty_struct *tty, int break_state)

dev_dbg(&port->dev, "Turning break %s\n", state == 0 ? "off" : "on");

- xr_set_reg_uart(port, type->tx_break, state);
+ return xr_set_reg_uart(port, type->tx_break, state);
}

/* Tx and Rx clock mask values obtained from section 3.3.4 of datasheet */
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index 7eeb5f9c4f0d..1a0a4dc87980 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -278,7 +278,7 @@ struct usb_serial_driver {
int (*set_serial)(struct tty_struct *tty, struct serial_struct *ss);
void (*set_termios)(struct tty_struct *tty, struct usb_serial_port *port,
const struct ktermios *old);
- void (*break_ctl)(struct tty_struct *tty, int break_state);
+ int (*break_ctl)(struct tty_struct *tty, int break_state);
unsigned int (*chars_in_buffer)(struct tty_struct *tty);
void (*wait_until_sent)(struct tty_struct *tty, long timeout);
bool (*tx_empty)(struct usb_serial_port *port);
--
2.39.3