[PATCH 23/35] USB: serial: make usb_serial_driver::write_room return uint

From: Jiri Slaby
Date: Wed May 05 2021 - 05:20:56 EST

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Line disciplines expect a positive value or zero returned from
tty->ops->write_room (invoked by tty_write_room). Both of them were
switched in the previous patch. So now, switch also
usb_serial_driver::write_room and all its users.

Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
Cc: Johan Hovold <johan@xxxxxxxxxx>
Cc: linux-usb@xxxxxxxxxxxxxxx
---
drivers/usb/serial/cyberjack.c | 4 ++--
drivers/usb/serial/cypress_m8.c | 8 ++++----
drivers/usb/serial/digi_acceleport.c | 8 ++++----
drivers/usb/serial/garmin_gps.c | 2 +-
drivers/usb/serial/generic.c | 6 +++---
drivers/usb/serial/io_edgeport.c | 6 +++---
drivers/usb/serial/io_ti.c | 6 +++---
drivers/usb/serial/ir-usb.c | 6 +++---
drivers/usb/serial/keyspan.c | 4 ++--
drivers/usb/serial/kobil_sct.c | 4 ++--
drivers/usb/serial/mos7720.c | 6 +++---
drivers/usb/serial/mos7840.c | 7 +++----
drivers/usb/serial/opticon.c | 2 +-
drivers/usb/serial/oti6858.c | 6 +++---
drivers/usb/serial/quatech2.c | 4 ++--
drivers/usb/serial/sierra.c | 2 +-
drivers/usb/serial/ti_usb_3410_5052.c | 8 ++++----
drivers/usb/serial/usb-wwan.h | 2 +-
drivers/usb/serial/usb_wwan.c | 6 +++---
include/linux/usb/serial.h | 4 ++--
20 files changed, 50 insertions(+), 51 deletions(-)

diff --git a/drivers/usb/serial/cyberjack.c b/drivers/usb/serial/cyberjack.c
index cf389224d528..51e5aac3bf4c 100644
--- a/drivers/usb/serial/cyberjack.c
+++ b/drivers/usb/serial/cyberjack.c
@@ -53,7 +53,7 @@ static int cyberjack_open(struct tty_struct *tty,
static void cyberjack_close(struct usb_serial_port *port);
static int cyberjack_write(struct tty_struct *tty,
struct usb_serial_port *port, const unsigned char *buf, int count);
-static int cyberjack_write_room(struct tty_struct *tty);
+static unsigned int cyberjack_write_room(struct tty_struct *tty);
static void cyberjack_read_int_callback(struct urb *urb);
static void cyberjack_read_bulk_callback(struct urb *urb);
static void cyberjack_write_bulk_callback(struct urb *urb);
@@ -240,7 +240,7 @@ static int cyberjack_write(struct tty_struct *tty,
return count;
}

-static int cyberjack_write_room(struct tty_struct *tty)
+static unsigned int cyberjack_write_room(struct tty_struct *tty)
{
/* FIXME: .... */
return CYBERJACK_LOCAL_BUF_SIZE;
diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index 166ee2286fda..5e7d2f9fa0c2 100644
--- a/drivers/usb/serial/cypress_m8.c
+++ b/drivers/usb/serial/cypress_m8.c
@@ -122,7 +122,7 @@ static void cypress_dtr_rts(struct usb_serial_port *port, int on);
static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count);
static void cypress_send(struct usb_serial_port *port);
-static int cypress_write_room(struct tty_struct *tty);
+static unsigned int cypress_write_room(struct tty_struct *tty);
static void cypress_earthmate_init_termios(struct tty_struct *tty);
static void cypress_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old);
@@ -789,18 +789,18 @@ static void cypress_send(struct usb_serial_port *port)

/* returns how much space is available in the soft buffer */
-static int cypress_write_room(struct tty_struct *tty)
+static unsigned int cypress_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct cypress_private *priv = usb_get_serial_port_data(port);
- int room = 0;
+ unsigned int room;
unsigned long flags;

spin_lock_irqsave(&priv->lock, flags);
room = kfifo_avail(&priv->write_fifo);
spin_unlock_irqrestore(&priv->lock, flags);

- dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
+ dev_dbg(&port->dev, "%s - returns %u\n", __func__, room);
return room;
}

diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index 8b2f06539f2c..5deb900450ee 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -223,7 +223,7 @@ static int digi_tiocmset(struct tty_struct *tty, unsigned int set,
static int digi_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count);
static void digi_write_bulk_callback(struct urb *urb);
-static int digi_write_room(struct tty_struct *tty);
+static unsigned int digi_write_room(struct tty_struct *tty);
static int digi_chars_in_buffer(struct tty_struct *tty);
static int digi_open(struct tty_struct *tty, struct usb_serial_port *port);
static void digi_close(struct usb_serial_port *port);
@@ -1020,11 +1020,11 @@ static void digi_write_bulk_callback(struct urb *urb)
tty_port_tty_wakeup(&port->port);
}

-static int digi_write_room(struct tty_struct *tty)
+static unsigned int digi_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct digi_port *priv = usb_get_serial_port_data(port);
- int room;
+ unsigned int room;
unsigned long flags = 0;

spin_lock_irqsave(&priv->dp_port_lock, flags);
@@ -1035,7 +1035,7 @@ static int digi_write_room(struct tty_struct *tty)
room = port->bulk_out_size - 2 - priv->dp_out_buf_len;

spin_unlock_irqrestore(&priv->dp_port_lock, flags);
- dev_dbg(&port->dev, "digi_write_room: port=%d, room=%d\n", priv->dp_port_num, room);
+ dev_dbg(&port->dev, "digi_write_room: port=%d, room=%u\n", priv->dp_port_num, room);
return room;

}
diff --git a/drivers/usb/serial/garmin_gps.c b/drivers/usb/serial/garmin_gps.c
index 50e8bdc77e71..756d1ac7e96f 100644
--- a/drivers/usb/serial/garmin_gps.c
+++ b/drivers/usb/serial/garmin_gps.c
@@ -1113,7 +1113,7 @@ static int garmin_write(struct tty_struct *tty, struct usb_serial_port *port,
}

-static int garmin_write_room(struct tty_struct *tty)
+static unsigned int garmin_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
/*
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index d10aa3d2ee49..bc3cf66af0de 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -230,11 +230,11 @@ int usb_serial_generic_write(struct tty_struct *tty,
}
EXPORT_SYMBOL_GPL(usb_serial_generic_write);

-int usb_serial_generic_write_room(struct tty_struct *tty)
+unsigned int usb_serial_generic_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
unsigned long flags;
- int room;
+ unsigned int room;

if (!port->bulk_out_size)
return 0;
@@ -243,7 +243,7 @@ int usb_serial_generic_write_room(struct tty_struct *tty)
room = kfifo_avail(&port->write_fifo);
spin_unlock_irqrestore(&port->lock, flags);

- dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
+ dev_dbg(&port->dev, "%s - returns %u\n", __func__, room);
return room;
}

diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index e6fe3882bf69..f6cedc87d3e4 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -1355,11 +1355,11 @@ static void send_more_port_data(struct edgeport_serial *edge_serial,
* we return the amount of room that we have for this port (the txCredits)
* otherwise we return a negative error number.
*****************************************************************************/
-static int edge_write_room(struct tty_struct *tty)
+static unsigned int edge_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
- int room;
+ unsigned int room;
unsigned long flags;

if (edge_port == NULL)
@@ -1377,7 +1377,7 @@ static int edge_write_room(struct tty_struct *tty)
room = edge_port->txCredits - edge_port->txfifo.count;
spin_unlock_irqrestore(&edge_port->ep_lock, flags);

- dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
+ dev_dbg(&port->dev, "%s - returns %u\n", __func__, room);
return room;
}

diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index 39503fdccebf..94c82c33e629 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -2067,11 +2067,11 @@ static void edge_send(struct usb_serial_port *port, struct tty_struct *tty)
tty_wakeup(tty);
}

-static int edge_write_room(struct tty_struct *tty)
+static unsigned int edge_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct edgeport_port *edge_port = usb_get_serial_port_data(port);
- int room = 0;
+ unsigned int room;
unsigned long flags;

if (edge_port == NULL)
@@ -2083,7 +2083,7 @@ static int edge_write_room(struct tty_struct *tty)
room = kfifo_avail(&port->write_fifo);
spin_unlock_irqrestore(&edge_port->ep_lock, flags);

- dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
+ dev_dbg(&port->dev, "%s - returns %u\n", __func__, room);
return room;
}

diff --git a/drivers/usb/serial/ir-usb.c b/drivers/usb/serial/ir-usb.c
index 172261a908d8..7b44dbea95cd 100644
--- a/drivers/usb/serial/ir-usb.c
+++ b/drivers/usb/serial/ir-usb.c
@@ -47,7 +47,7 @@ static int xbof = -1;
static int ir_startup (struct usb_serial *serial);
static int ir_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count);
-static int ir_write_room(struct tty_struct *tty);
+static unsigned int ir_write_room(struct tty_struct *tty);
static void ir_write_bulk_callback(struct urb *urb);
static void ir_process_read_urb(struct urb *urb);
static void ir_set_termios(struct tty_struct *tty,
@@ -339,10 +339,10 @@ static void ir_write_bulk_callback(struct urb *urb)
usb_serial_port_softint(port);
}

-static int ir_write_room(struct tty_struct *tty)
+static unsigned int ir_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
- int count = 0;
+ unsigned int count = 0;

if (port->bulk_out_size == 0)
return 0;
diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c
index b04a029e3657..87b89c99d517 100644
--- a/drivers/usb/serial/keyspan.c
+++ b/drivers/usb/serial/keyspan.c
@@ -1453,13 +1453,13 @@ static void usa67_glocont_callback(struct urb *urb)
}
}

-static int keyspan_write_room(struct tty_struct *tty)
+static unsigned int keyspan_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct keyspan_port_private *p_priv;
const struct keyspan_device_details *d_details;
int flip;
- int data_len;
+ unsigned int data_len;
struct urb *this_urb;

p_priv = usb_get_serial_port_data(port);
diff --git a/drivers/usb/serial/kobil_sct.c b/drivers/usb/serial/kobil_sct.c
index a9bc546626ab..4ed8b8b0a361 100644
--- a/drivers/usb/serial/kobil_sct.c
+++ b/drivers/usb/serial/kobil_sct.c
@@ -53,7 +53,7 @@ static int kobil_open(struct tty_struct *tty, struct usb_serial_port *port);
static void kobil_close(struct usb_serial_port *port);
static int kobil_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count);
-static int kobil_write_room(struct tty_struct *tty);
+static unsigned int kobil_write_room(struct tty_struct *tty);
static int kobil_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg);
static int kobil_tiocmget(struct tty_struct *tty);
@@ -358,7 +358,7 @@ static int kobil_write(struct tty_struct *tty, struct usb_serial_port *port,
}

-static int kobil_write_room(struct tty_struct *tty)
+static unsigned int kobil_write_room(struct tty_struct *tty)
{
/* FIXME */
return 8;
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 6ee83886e2c9..d9cc7f840d48 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -1033,11 +1033,11 @@ static void mos7720_break(struct tty_struct *tty, int break_state)
* If successful, we return the amount of room that we have for this port
* Otherwise we return a negative error number.
*/
-static int mos7720_write_room(struct tty_struct *tty)
+static unsigned int mos7720_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7720_port;
- int room = 0;
+ unsigned int room = 0;
int i;

mos7720_port = usb_get_serial_port_data(port);
@@ -1051,7 +1051,7 @@ static int mos7720_write_room(struct tty_struct *tty)
room += URB_TRANSFER_BUFFER_SIZE;
}

- dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
+ dev_dbg(&port->dev, "%s - returns %u\n", __func__, room);
return room;
}

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 28e4093794e0..f25d4ba43b9a 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -815,15 +815,14 @@ static void mos7840_break(struct tty_struct *tty, int break_state)
* this function is called by the tty driver when it wants to know how many
* bytes of data we can accept for a specific port.
* If successful, we return the amount of room that we have for this port
- * Otherwise we return a negative error number.
*****************************************************************************/

-static int mos7840_write_room(struct tty_struct *tty)
+static unsigned int mos7840_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
int i;
- int room = 0;
+ unsigned int room = 0;
unsigned long flags;

spin_lock_irqsave(&mos7840_port->pool_lock, flags);
@@ -834,7 +833,7 @@ static int mos7840_write_room(struct tty_struct *tty)
spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);

room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
- dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
+ dev_dbg(&mos7840_port->port->dev, "%s - returns %u\n", __func__, room);
return room;

}
diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index 40c713fae0c3..37b51947bd0b 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -267,7 +267,7 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
return ret;
}

-static int opticon_write_room(struct tty_struct *tty)
+static unsigned int opticon_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct opticon_private *priv = usb_get_serial_port_data(port);
diff --git a/drivers/usb/serial/oti6858.c b/drivers/usb/serial/oti6858.c
index 65cd0341fa78..4ab9f335dd0e 100644
--- a/drivers/usb/serial/oti6858.c
+++ b/drivers/usb/serial/oti6858.c
@@ -126,7 +126,7 @@ static void oti6858_read_bulk_callback(struct urb *urb);
static void oti6858_write_bulk_callback(struct urb *urb);
static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count);
-static int oti6858_write_room(struct tty_struct *tty);
+static unsigned int oti6858_write_room(struct tty_struct *tty);
static int oti6858_chars_in_buffer(struct tty_struct *tty);
static int oti6858_tiocmget(struct tty_struct *tty);
static int oti6858_tiocmset(struct tty_struct *tty,
@@ -363,10 +363,10 @@ static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
return count;
}

-static int oti6858_write_room(struct tty_struct *tty)
+static unsigned int oti6858_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
- int room = 0;
+ unsigned int room;
unsigned long flags;

spin_lock_irqsave(&port->lock, flags);
diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c
index 5f2e7f668e68..3b5f2032ecdb 100644
--- a/drivers/usb/serial/quatech2.c
+++ b/drivers/usb/serial/quatech2.c
@@ -870,12 +870,12 @@ static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)

}

-static int qt2_write_room(struct tty_struct *tty)
+static unsigned int qt2_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct qt2_port_private *port_priv;
unsigned long flags = 0;
- int r;
+ unsigned int r;

port_priv = usb_get_serial_port_data(port);

diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 54e16ffc30a0..753cee5d17a1 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -613,7 +613,7 @@ static void sierra_instat_callback(struct urb *urb)
}
}

-static int sierra_write_room(struct tty_struct *tty)
+static unsigned int sierra_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct sierra_port_private *portdata = usb_get_serial_port_data(port);
diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index caa46ac23db9..2c543c175296 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -307,7 +307,7 @@ static int ti_open(struct tty_struct *tty, struct usb_serial_port *port);
static void ti_close(struct usb_serial_port *port);
static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *data, int count);
-static int ti_write_room(struct tty_struct *tty);
+static unsigned int ti_write_room(struct tty_struct *tty);
static int ti_chars_in_buffer(struct tty_struct *tty);
static bool ti_tx_empty(struct usb_serial_port *port);
static void ti_throttle(struct tty_struct *tty);
@@ -810,18 +810,18 @@ static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
}

-static int ti_write_room(struct tty_struct *tty)
+static unsigned int ti_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct ti_port *tport = usb_get_serial_port_data(port);
- int room = 0;
+ unsigned int room;
unsigned long flags;

spin_lock_irqsave(&tport->tp_lock, flags);
room = kfifo_avail(&port->write_fifo);
spin_unlock_irqrestore(&tport->tp_lock, flags);

- dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
+ dev_dbg(&port->dev, "%s - returns %u\n", __func__, room);
return room;
}

diff --git a/drivers/usb/serial/usb-wwan.h b/drivers/usb/serial/usb-wwan.h
index b5331d03092f..6c7c9f3309b0 100644
--- a/drivers/usb/serial/usb-wwan.h
+++ b/drivers/usb/serial/usb-wwan.h
@@ -11,7 +11,7 @@ extern int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port);
extern void usb_wwan_close(struct usb_serial_port *port);
extern int usb_wwan_port_probe(struct usb_serial_port *port);
extern void usb_wwan_port_remove(struct usb_serial_port *port);
-extern int usb_wwan_write_room(struct tty_struct *tty);
+extern unsigned int usb_wwan_write_room(struct tty_struct *tty);
extern int usb_wwan_tiocmget(struct tty_struct *tty);
extern int usb_wwan_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear);
diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 3eb72c59ede6..06212f08d9f9 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -278,12 +278,12 @@ static void usb_wwan_outdat_callback(struct urb *urb)
}
}

-int usb_wwan_write_room(struct tty_struct *tty)
+unsigned int usb_wwan_write_room(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_wwan_port_private *portdata;
int i;
- int data_len = 0;
+ unsigned int data_len = 0;
struct urb *this_urb;

portdata = usb_get_serial_port_data(port);
@@ -294,7 +294,7 @@ int usb_wwan_write_room(struct tty_struct *tty)
data_len += OUT_BUFLEN;
}

- dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
+ dev_dbg(&port->dev, "%s: %u\n", __func__, data_len);
return data_len;
}
EXPORT_SYMBOL(usb_wwan_write_room);
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index 8c63fa9bfc74..6472d1f7b028 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -276,7 +276,7 @@ struct usb_serial_driver {
int (*write)(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *buf, int count);
/* Called only by the tty layer */
- int (*write_room)(struct tty_struct *tty);
+ unsigned int (*write_room)(struct tty_struct *tty);
int (*ioctl)(struct tty_struct *tty,
unsigned int cmd, unsigned long arg);
void (*get_serial)(struct tty_struct *tty, struct serial_struct *ss);
@@ -347,7 +347,7 @@ int usb_serial_generic_write(struct tty_struct *tty, struct usb_serial_port *por
const unsigned char *buf, int count);
void usb_serial_generic_close(struct usb_serial_port *port);
int usb_serial_generic_resume(struct usb_serial *serial);
-int usb_serial_generic_write_room(struct tty_struct *tty);
+unsigned int usb_serial_generic_write_room(struct tty_struct *tty);
int usb_serial_generic_chars_in_buffer(struct tty_struct *tty);
void usb_serial_generic_wait_until_sent(struct tty_struct *tty, long timeout);
void usb_serial_generic_read_bulk_callback(struct urb *urb);
--
2.31.1

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