USB: serial: make remove callback return void

All usb_serial drivers return 0 in their remove callbacks and driver
core ignores the value returned by usb_serial_device_remove(). So change
the remove callback to return void and return 0 unconditionally in
usb_serial_device_remove().
Signed-off-by: NUwe Kleine-König <uwe@kleine-koenig.org>
Link: https://lore.kernel.org/r/20210208143149.963644-2-uwe@kleine-koenig.orgSigned-off-by: NJohan Hovold <johan@kernel.org>

drivers/usb/serial/ark3116.c

@@ -178,15 +178,13 @@ static int ark3116_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int ark3116_port_remove(struct usb_serial_port *port)
+static void ark3116_port_remove(struct usb_serial_port *port)
 {
 	struct ark3116_private *priv = usb_get_serial_port_data(port);
 
 	/* device is closed, so URBs and DMA should be down */
 	mutex_destroy(&priv->hw_lock);
 	kfree(priv);
-
-	return 0;
 }
 
 static void ark3116_set_termios(struct tty_struct *tty,

drivers/usb/serial/belkin_sa.c

@@ -37,7 +37,7 @@
 
 /* function prototypes for a Belkin USB Serial Adapter F5U103 */
 static int belkin_sa_port_probe(struct usb_serial_port *port);
-static int belkin_sa_port_remove(struct usb_serial_port *port);
+static void belkin_sa_port_remove(struct usb_serial_port *port);
 static int  belkin_sa_open(struct tty_struct *tty,
 			struct usb_serial_port *port);
 static void belkin_sa_close(struct usb_serial_port *port);
@@ -134,14 +134,12 @@ static int belkin_sa_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int belkin_sa_port_remove(struct usb_serial_port *port)
+static void belkin_sa_port_remove(struct usb_serial_port *port)
 {
 	struct belkin_sa_private *priv;
 
 	priv = usb_get_serial_port_data(port);
 	kfree(priv);
-
-	return 0;
 }
 
 static int belkin_sa_open(struct tty_struct *tty,

drivers/usb/serial/bus.c

@@ -88,7 +88,6 @@ static int usb_serial_device_remove(struct device *dev)
 {
 	struct usb_serial_port *port = to_usb_serial_port(dev);
 	struct usb_serial_driver *driver;
-	int retval = 0;
 	int minor;
 	int autopm_err;
 
@@ -105,7 +104,7 @@ static int usb_serial_device_remove(struct device *dev)
 
 	driver = port->serial->type;
 	if (driver->port_remove)
-		retval = driver->port_remove(port);
+		driver->port_remove(port);
 
 	dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
 		 driver->description, minor);
@@ -113,7 +112,7 @@ static int usb_serial_device_remove(struct device *dev)
 	if (!autopm_err)
 		usb_autopm_put_interface(port->serial->interface);
 
-	return retval;
+	return 0;
 }
 
 static ssize_t new_id_store(struct device_driver *driver,

drivers/usb/serial/ch341.c

@@ -419,14 +419,12 @@ error:	kfree(priv);
 	return r;
 }
 
-static int ch341_port_remove(struct usb_serial_port *port)
+static void ch341_port_remove(struct usb_serial_port *port)
 {
 	struct ch341_private *priv;
 
 	priv = usb_get_serial_port_data(port);
 	kfree(priv);
-
-	return 0;
 }
 
 static int ch341_carrier_raised(struct usb_serial_port *port)

drivers/usb/serial/cp210x.c

@@ -44,7 +44,7 @@ static int cp210x_attach(struct usb_serial *);
 static void cp210x_disconnect(struct usb_serial *);
 static void cp210x_release(struct usb_serial *);
 static int cp210x_port_probe(struct usb_serial_port *);
-static int cp210x_port_remove(struct usb_serial_port *);
+static void cp210x_port_remove(struct usb_serial_port *);
 static void cp210x_dtr_rts(struct usb_serial_port *port, int on);
 static void cp210x_process_read_urb(struct urb *urb);
 static void cp210x_enable_event_mode(struct usb_serial_port *port);
@@ -1841,14 +1841,12 @@ static int cp210x_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int cp210x_port_remove(struct usb_serial_port *port)
+static void cp210x_port_remove(struct usb_serial_port *port)
 {
 	struct cp210x_port_private *port_priv;
 
 	port_priv = usb_get_serial_port_data(port);
 	kfree(port_priv);
-
-	return 0;
 }
 
 static void cp210x_init_max_speed(struct usb_serial *serial)

drivers/usb/serial/cyberjack.c

@@ -47,7 +47,7 @@
 
 /* Function prototypes */
 static int cyberjack_port_probe(struct usb_serial_port *port);
-static int cyberjack_port_remove(struct usb_serial_port *port);
+static void cyberjack_port_remove(struct usb_serial_port *port);
 static int  cyberjack_open(struct tty_struct *tty,
 	struct usb_serial_port *port);
 static void cyberjack_close(struct usb_serial_port *port);
@@ -120,7 +120,7 @@ static int cyberjack_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int cyberjack_port_remove(struct usb_serial_port *port)
+static void cyberjack_port_remove(struct usb_serial_port *port)
 {
 	struct cyberjack_private *priv;
 
@@ -128,8 +128,6 @@ static int cyberjack_port_remove(struct usb_serial_port *port)
 
 	priv = usb_get_serial_port_data(port);
 	kfree(priv);
-
-	return 0;
 }
 
 static int  cyberjack_open(struct tty_struct *tty,

drivers/usb/serial/cypress_m8.c

@@ -115,7 +115,7 @@ struct cypress_private {
 static int  cypress_earthmate_port_probe(struct usb_serial_port *port);
 static int  cypress_hidcom_port_probe(struct usb_serial_port *port);
 static int  cypress_ca42v2_port_probe(struct usb_serial_port *port);
-static int  cypress_port_remove(struct usb_serial_port *port);
+static void cypress_port_remove(struct usb_serial_port *port);
 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 static void cypress_close(struct usb_serial_port *port);
 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
@@ -564,7 +564,7 @@ static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int cypress_port_remove(struct usb_serial_port *port)
+static void cypress_port_remove(struct usb_serial_port *port)
 {
 	struct cypress_private *priv;
 
@@ -572,8 +572,6 @@ static int cypress_port_remove(struct usb_serial_port *port)
 
 	kfifo_free(&priv->write_fifo);
 	kfree(priv);
-
-	return 0;
 }
 
 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)

drivers/usb/serial/digi_acceleport.c

@@ -233,7 +233,7 @@ static int digi_startup(struct usb_serial *serial);
 static void digi_disconnect(struct usb_serial *serial);
 static void digi_release(struct usb_serial *serial);
 static int digi_port_probe(struct usb_serial_port *port);
-static int digi_port_remove(struct usb_serial_port *port);
+static void digi_port_remove(struct usb_serial_port *port);
 static void digi_read_bulk_callback(struct urb *urb);
 static int digi_read_inb_callback(struct urb *urb);
 static int digi_read_oob_callback(struct urb *urb);
@@ -1281,14 +1281,12 @@ static int digi_port_probe(struct usb_serial_port *port)
 	return digi_port_init(port, port->port_number);
 }
 
-static int digi_port_remove(struct usb_serial_port *port)
+static void digi_port_remove(struct usb_serial_port *port)
 {
 	struct digi_port *priv;
 
 	priv = usb_get_serial_port_data(port);
 	kfree(priv);
-
-	return 0;
 }
 
 static void digi_read_bulk_callback(struct urb *urb)

drivers/usb/serial/f81534.c

@@ -1430,12 +1430,11 @@ static int f81534_port_probe(struct usb_serial_port *port)
 	return f81534_set_port_output_pin(port);
 }
 
-static int f81534_port_remove(struct usb_serial_port *port)
+static void f81534_port_remove(struct usb_serial_port *port)
 {
 	struct f81534_port_private *port_priv = usb_get_serial_port_data(port);
 
 	flush_work(&port_priv->lsr_work);
-	return 0;
 }
 
 static int f81534_tiocmget(struct tty_struct *tty)

drivers/usb/serial/ftdi_sio.c

@@ -1069,7 +1069,7 @@ static const char *ftdi_chip_name[] = {
 static int  ftdi_sio_probe(struct usb_serial *serial,
 					const struct usb_device_id *id);
 static int  ftdi_sio_port_probe(struct usb_serial_port *port);
-static int  ftdi_sio_port_remove(struct usb_serial_port *port);
+static void ftdi_sio_port_remove(struct usb_serial_port *port);
 static int  ftdi_open(struct tty_struct *tty, struct usb_serial_port *port);
 static void ftdi_dtr_rts(struct usb_serial_port *port, int on);
 static void ftdi_process_read_urb(struct urb *urb);
@@ -2400,7 +2400,7 @@ static int ftdi_stmclite_probe(struct usb_serial *serial)
 	return 0;
 }
 
-static int ftdi_sio_port_remove(struct usb_serial_port *port)
+static void ftdi_sio_port_remove(struct usb_serial_port *port)
 {
 	struct ftdi_private *priv = usb_get_serial_port_data(port);
 
@@ -2409,8 +2409,6 @@ static int ftdi_sio_port_remove(struct usb_serial_port *port)
 	remove_sysfs_attrs(port);
 
 	kfree(priv);
-
-	return 0;
 }
 
 static int ftdi_open(struct tty_struct *tty, struct usb_serial_port *port)

drivers/usb/serial/garmin_gps.c

@@ -1401,7 +1401,7 @@ static int garmin_port_probe(struct usb_serial_port *port)
 }
 
 
-static int garmin_port_remove(struct usb_serial_port *port)
+static void garmin_port_remove(struct usb_serial_port *port)
 {
 	struct garmin_data *garmin_data_p = usb_get_serial_port_data(port);
 
@@ -1409,7 +1409,6 @@ static int garmin_port_remove(struct usb_serial_port *port)
 	usb_kill_urb(port->interrupt_in_urb);
 	del_timer_sync(&garmin_data_p->timer);
 	kfree(garmin_data_p);
-	return 0;
 }
 
 

drivers/usb/serial/io_edgeport.c

@@ -293,7 +293,7 @@ static int  edge_startup(struct usb_serial *serial);
 static void edge_disconnect(struct usb_serial *serial);
 static void edge_release(struct usb_serial *serial);
 static int edge_port_probe(struct usb_serial_port *port);
-static int edge_port_remove(struct usb_serial_port *port);
+static void edge_port_remove(struct usb_serial_port *port);
 
 /* function prototypes for all of our local functions */
 
@@ -3078,14 +3078,12 @@ static int edge_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int edge_port_remove(struct usb_serial_port *port)
+static void edge_port_remove(struct usb_serial_port *port)
 {
 	struct edgeport_port *edge_port;
 
 	edge_port = usb_get_serial_port_data(port);
 	kfree(edge_port);
-
-	return 0;
 }
 
 static struct usb_serial_driver edgeport_2port_device = {

drivers/usb/serial/io_ti.c

@@ -2625,15 +2625,13 @@ static int edge_port_probe(struct usb_serial_port *port)
 	return ret;
 }
 
-static int edge_port_remove(struct usb_serial_port *port)
+static void edge_port_remove(struct usb_serial_port *port)
 {
 	struct edgeport_port *edge_port;
 
 	edge_port = usb_get_serial_port_data(port);
 	edge_remove_sysfs_attrs(port);
 	kfree(edge_port);
-
-	return 0;
 }
 
 /* Sysfs Attributes */

drivers/usb/serial/iuu_phoenix.c

@@ -100,7 +100,7 @@ static int iuu_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int iuu_port_remove(struct usb_serial_port *port)
+static void iuu_port_remove(struct usb_serial_port *port)
 {
 	struct iuu_private *priv = usb_get_serial_port_data(port);
 
@@ -108,8 +108,6 @@ static int iuu_port_remove(struct usb_serial_port *port)
 	kfree(priv->writebuf);
 	kfree(priv->buf);
 	kfree(priv);
-
-	return 0;
 }
 
 static int iuu_tiocmset(struct tty_struct *tty,

drivers/usb/serial/keyspan.c

@@ -49,7 +49,7 @@ static int keyspan_startup(struct usb_serial *serial);
 static void keyspan_disconnect(struct usb_serial *serial);
 static void keyspan_release(struct usb_serial *serial);
 static int keyspan_port_probe(struct usb_serial_port *port);
-static int keyspan_port_remove(struct usb_serial_port *port);
+static void keyspan_port_remove(struct usb_serial_port *port);
 static int keyspan_write_room(struct tty_struct *tty);
 static int keyspan_write(struct tty_struct *tty, struct usb_serial_port *port,
 			 const unsigned char *buf, int count);
@@ -2985,7 +2985,7 @@ static int keyspan_port_probe(struct usb_serial_port *port)
 	return -ENOMEM;
 }
 
-static int keyspan_port_remove(struct usb_serial_port *port)
+static void keyspan_port_remove(struct usb_serial_port *port)
 {
 	struct keyspan_port_private *p_priv;
 	int i;
@@ -3014,8 +3014,6 @@ static int keyspan_port_remove(struct usb_serial_port *port)
 		kfree(p_priv->in_buffer[i]);
 
 	kfree(p_priv);
-
-	return 0;
 }
 
 /* Structs for the devices, pre and post renumeration. */

drivers/usb/serial/keyspan_pda.c

@@ -672,14 +672,12 @@ static int keyspan_pda_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int keyspan_pda_port_remove(struct usb_serial_port *port)
+static void keyspan_pda_port_remove(struct usb_serial_port *port)
 {
 	struct keyspan_pda_private *priv;
 
 	priv = usb_get_serial_port_data(port);
 	kfree(priv);
-
-	return 0;
 }
 
 static struct usb_serial_driver keyspan_pda_fake_device = {

drivers/usb/serial/kl5kusb105.c

@@ -52,7 +52,7 @@
  * Function prototypes
  */
 static int klsi_105_port_probe(struct usb_serial_port *port);
-static int klsi_105_port_remove(struct usb_serial_port *port);
+static void klsi_105_port_remove(struct usb_serial_port *port);
 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
 static void klsi_105_close(struct usb_serial_port *port);
 static void klsi_105_set_termios(struct tty_struct *tty,
@@ -231,14 +231,12 @@ static int klsi_105_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int klsi_105_port_remove(struct usb_serial_port *port)
+static void klsi_105_port_remove(struct usb_serial_port *port)
 {
 	struct klsi_105_private *priv;
 
 	priv = usb_get_serial_port_data(port);
 	kfree(priv);
-
-	return 0;
 }
 
 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)

drivers/usb/serial/kobil_sct.c

@@ -48,7 +48,7 @@
 
 /* Function prototypes */
 static int kobil_port_probe(struct usb_serial_port *probe);
-static int kobil_port_remove(struct usb_serial_port *probe);
+static void kobil_port_remove(struct usb_serial_port *probe);
 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,
@@ -143,14 +143,12 @@ static int kobil_port_probe(struct usb_serial_port *port)
 }
 
 
-static int kobil_port_remove(struct usb_serial_port *port)
+static void kobil_port_remove(struct usb_serial_port *port)
 {
 	struct kobil_private *priv;
 
 	priv = usb_get_serial_port_data(port);
 	kfree(priv);
-
-	return 0;
 }
 
 static void kobil_init_termios(struct tty_struct *tty)

drivers/usb/serial/mct_u232.c

@@ -39,7 +39,7 @@
  * Function prototypes
  */
 static int  mct_u232_port_probe(struct usb_serial_port *port);
-static int  mct_u232_port_remove(struct usb_serial_port *remove);
+static void mct_u232_port_remove(struct usb_serial_port *remove);
 static int  mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port);
 static void mct_u232_close(struct usb_serial_port *port);
 static void mct_u232_dtr_rts(struct usb_serial_port *port, int on);
@@ -400,14 +400,12 @@ static int mct_u232_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int mct_u232_port_remove(struct usb_serial_port *port)
+static void mct_u232_port_remove(struct usb_serial_port *port)
 {
 	struct mct_u232_private *priv;
 
 	priv = usb_get_serial_port_data(port);
 	kfree(priv);
-
-	return 0;
 }
 
 static int  mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port)

drivers/usb/serial/metro-usb.c

@@ -256,14 +256,12 @@ static int metrousb_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int metrousb_port_remove(struct usb_serial_port *port)
+static void metrousb_port_remove(struct usb_serial_port *port)
 {
 	struct metrousb_private *metro_priv;
 
 	metro_priv = usb_get_serial_port_data(port);
 	kfree(metro_priv);
-
-	return 0;
 }
 
 static void metrousb_throttle(struct tty_struct *tty)

drivers/usb/serial/mos7720.c

@@ -1760,14 +1760,12 @@ static int mos7720_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int mos7720_port_remove(struct usb_serial_port *port)
+static void mos7720_port_remove(struct usb_serial_port *port)
 {
 	struct moschip_port *mos7720_port;
 
 	mos7720_port = usb_get_serial_port_data(port);
 	kfree(mos7720_port);
-
-	return 0;
 }
 
 static struct usb_serial_driver moschip7720_2port_driver = {

drivers/usb/serial/mos7840.c

@@ -1745,7 +1745,7 @@ static int mos7840_port_probe(struct usb_serial_port *port)
 	return status;
 }
 
-static int mos7840_port_remove(struct usb_serial_port *port)
+static void mos7840_port_remove(struct usb_serial_port *port)
 {
 	struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 
@@ -1762,8 +1762,6 @@ static int mos7840_port_remove(struct usb_serial_port *port)
 	}
 
 	kfree(mos7840_port);
-
-	return 0;
 }
 
 static struct usb_serial_driver moschip7840_4port_device = {

drivers/usb/serial/omninet.c

@@ -36,7 +36,7 @@ static int omninet_prepare_write_buffer(struct usb_serial_port *port,
 static int omninet_calc_num_ports(struct usb_serial *serial,
 				struct usb_serial_endpoints *epds);
 static int omninet_port_probe(struct usb_serial_port *port);
-static int omninet_port_remove(struct usb_serial_port *port);
+static void omninet_port_remove(struct usb_serial_port *port);
 
 static const struct usb_device_id id_table[] = {
 	{ USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
@@ -121,14 +121,12 @@ static int omninet_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int omninet_port_remove(struct usb_serial_port *port)
+static void omninet_port_remove(struct usb_serial_port *port)
 {
 	struct omninet_data *od;
 
 	od = usb_get_serial_port_data(port);
 	kfree(od);
-
-	return 0;
 }
 
 #define OMNINET_HEADERLEN	4

drivers/usb/serial/opticon.c

@@ -385,13 +385,11 @@ static int opticon_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int opticon_port_remove(struct usb_serial_port *port)
+static void opticon_port_remove(struct usb_serial_port *port)
 {
 	struct opticon_private *priv = usb_get_serial_port_data(port);
 
 	kfree(priv);
-
-	return 0;
 }
 
 static struct usb_serial_driver opticon_device = {

drivers/usb/serial/oti6858.c

@@ -132,7 +132,7 @@ static int oti6858_tiocmget(struct tty_struct *tty);
 static int oti6858_tiocmset(struct tty_struct *tty,
 				unsigned int set, unsigned int clear);
 static int oti6858_port_probe(struct usb_serial_port *port);
-static int oti6858_port_remove(struct usb_serial_port *port);
+static void oti6858_port_remove(struct usb_serial_port *port);
 
 /* device info */
 static struct usb_serial_driver oti6858_device = {
@@ -344,14 +344,12 @@ static int oti6858_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int oti6858_port_remove(struct usb_serial_port *port)
+static void oti6858_port_remove(struct usb_serial_port *port)
 {
 	struct oti6858_private *priv;
 
 	priv = usb_get_serial_port_data(port);
 	kfree(priv);
-
-	return 0;
 }
 
 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,

drivers/usb/serial/pl2303.c

@@ -450,13 +450,11 @@ static int pl2303_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int pl2303_port_remove(struct usb_serial_port *port)
+static void pl2303_port_remove(struct usb_serial_port *port)
 {
 	struct pl2303_private *priv = usb_get_serial_port_data(port);
 
 	kfree(priv);
-
-	return 0;
 }
 
 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)

drivers/usb/serial/quatech2.c

@@ -727,7 +727,7 @@ static int qt2_port_probe(struct usb_serial_port *port)
 	return -ENOMEM;
 }
 
-static int qt2_port_remove(struct usb_serial_port *port)
+static void qt2_port_remove(struct usb_serial_port *port)
 {
 	struct qt2_port_private *port_priv;
 
@@ -735,8 +735,6 @@ static int qt2_port_remove(struct usb_serial_port *port)
 	usb_free_urb(port_priv->write_urb);
 	kfree(port_priv->write_buffer);
 	kfree(port_priv);
-
-	return 0;
 }
 
 static int qt2_tiocmget(struct tty_struct *tty)

drivers/usb/serial/sierra.c

@@ -901,15 +901,13 @@ static int sierra_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int sierra_port_remove(struct usb_serial_port *port)
+static void sierra_port_remove(struct usb_serial_port *port)
 {
 	struct sierra_port_private *portdata;
 
 	portdata = usb_get_serial_port_data(port);
 	usb_set_serial_port_data(port, NULL);
 	kfree(portdata);
-
-	return 0;
 }
 
 #ifdef CONFIG_PM

drivers/usb/serial/spcp8x5.c

@@ -169,14 +169,12 @@ static int spcp8x5_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int spcp8x5_port_remove(struct usb_serial_port *port)
+static void spcp8x5_port_remove(struct usb_serial_port *port)
 {
 	struct spcp8x5_private *priv;
 
 	priv = usb_get_serial_port_data(port);
 	kfree(priv);
-
-	return 0;
 }
 
 static int spcp8x5_set_ctrl_line(struct usb_serial_port *port, u8 mcr)

drivers/usb/serial/ssu100.c

@@ -366,14 +366,12 @@ static int ssu100_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int ssu100_port_remove(struct usb_serial_port *port)
+static void ssu100_port_remove(struct usb_serial_port *port)
 {
 	struct ssu100_port_private *priv;
 
 	priv = usb_get_serial_port_data(port);
 	kfree(priv);
-
-	return 0;
 }
 
 static int ssu100_tiocmget(struct tty_struct *tty)

drivers/usb/serial/symbolserial.c

@@ -160,13 +160,11 @@ static int symbol_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int symbol_port_remove(struct usb_serial_port *port)
+static void symbol_port_remove(struct usb_serial_port *port)
 {
 	struct symbol_private *priv = usb_get_serial_port_data(port);
 
 	kfree(priv);
-
-	return 0;
 }
 
 static struct usb_serial_driver symbol_device = {

drivers/usb/serial/ti_usb_3410_5052.c

@@ -303,7 +303,7 @@ struct ti_device {
 static int ti_startup(struct usb_serial *serial);
 static void ti_release(struct usb_serial *serial);
 static int ti_port_probe(struct usb_serial_port *port);
-static int ti_port_remove(struct usb_serial_port *port);
+static void ti_port_remove(struct usb_serial_port *port);
 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,
@@ -629,14 +629,12 @@ static int ti_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int ti_port_remove(struct usb_serial_port *port)
+static void ti_port_remove(struct usb_serial_port *port)
 {
 	struct ti_port *tport;
 
 	tport = usb_get_serial_port_data(port);
 	kfree(tport);
-
-	return 0;
 }
 
 static int ti_open(struct tty_struct *tty, struct usb_serial_port *port)

drivers/usb/serial/upd78f0730.c

@@ -171,15 +171,13 @@ static int upd78f0730_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int upd78f0730_port_remove(struct usb_serial_port *port)
+static void upd78f0730_port_remove(struct usb_serial_port *port)
 {
 	struct upd78f0730_port_private *private;
 
 	private = usb_get_serial_port_data(port);
 	mutex_destroy(&private->lock);
 	kfree(private);
-
-	return 0;
 }
 
 static int upd78f0730_tiocmget(struct tty_struct *tty)

drivers/usb/serial/usb-wwan.h

@@ -10,7 +10,7 @@ extern void usb_wwan_dtr_rts(struct usb_serial_port *port, int on);
 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 int usb_wwan_port_remove(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 int usb_wwan_tiocmget(struct tty_struct *tty);
 extern int usb_wwan_tiocmset(struct tty_struct *tty,

drivers/usb/serial/usb_wwan.c

@@ -544,7 +544,7 @@ int usb_wwan_port_probe(struct usb_serial_port *port)
 }
 EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
 
-int usb_wwan_port_remove(struct usb_serial_port *port)
+void usb_wwan_port_remove(struct usb_serial_port *port)
 {
 	int i;
 	struct usb_wwan_port_private *portdata;
@@ -562,8 +562,6 @@ int usb_wwan_port_remove(struct usb_serial_port *port)
 	}
 
 	kfree(portdata);
-
-	return 0;
 }
 EXPORT_SYMBOL(usb_wwan_port_remove);
 

drivers/usb/serial/whiteheat.c

@@ -79,7 +79,7 @@ static int  whiteheat_firmware_attach(struct usb_serial *serial);
 static int  whiteheat_attach(struct usb_serial *serial);
 static void whiteheat_release(struct usb_serial *serial);
 static int  whiteheat_port_probe(struct usb_serial_port *port);
-static int  whiteheat_port_remove(struct usb_serial_port *port);
+static void whiteheat_port_remove(struct usb_serial_port *port);
 static int  whiteheat_open(struct tty_struct *tty,
 			struct usb_serial_port *port);
 static void whiteheat_close(struct usb_serial_port *port);
@@ -345,14 +345,12 @@ static int whiteheat_port_probe(struct usb_serial_port *port)
 	return 0;
 }
 
-static int whiteheat_port_remove(struct usb_serial_port *port)
+static void whiteheat_port_remove(struct usb_serial_port *port)
 {
 	struct whiteheat_private *info;
 
 	info = usb_get_serial_port_data(port);
 	kfree(info);
-
-	return 0;
 }
 
 static int whiteheat_open(struct tty_struct *tty, struct usb_serial_port *port)

include/linux/usb/serial.h

@@ -260,7 +260,7 @@ struct usb_serial_driver {
 	void (*release)(struct usb_serial *serial);
 
 	int (*port_probe)(struct usb_serial_port *port);
-	int (*port_remove)(struct usb_serial_port *port);
+	void (*port_remove)(struct usb_serial_port *port);
 
 	int (*suspend)(struct usb_serial *serial, pm_message_t message);
 	int (*resume)(struct usb_serial *serial);