Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index f7aaa7f..8f066bb 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -10,7 +10,7 @@
* This driver was originally based on the ACM driver by Armin Fuerst (which was
* based on a driver by Brad Keryan)
*
- * See Documentation/usb/usb-serial.txt for more information on using this
+ * See Documentation/usb/usb-serial.rst for more information on using this
* driver
*/
@@ -164,9 +164,9 @@
* @driver: the driver (USB in our case)
* @tty: the tty being created
*
- * Create the termios objects for this tty. We use the default
+ * Initialise the termios structure for this tty. We use the default
* USB serial settings but permit them to be overridden by
- * serial->type->init_termios.
+ * serial->type->init_termios on first open.
*
* This is the first place a new tty gets used. Hence this is where we
* acquire references to the usb_serial structure and the driver module,
@@ -178,6 +178,7 @@
int idx = tty->index;
struct usb_serial *serial;
struct usb_serial_port *port;
+ bool init_termios;
int retval = -ENODEV;
port = usb_serial_port_get_by_minor(idx);
@@ -192,14 +193,16 @@
if (retval)
goto error_get_interface;
+ init_termios = (driver->termios[idx] == NULL);
+
retval = tty_standard_install(driver, tty);
if (retval)
goto error_init_termios;
mutex_unlock(&serial->disc_mutex);
- /* allow the driver to update the settings */
- if (serial->type->init_termios)
+ /* allow the driver to update the initial settings */
+ if (init_termios && serial->type->init_termios)
serial->type->init_termios(tty);
tty->driver_data = port;
@@ -311,10 +314,7 @@
serial = port->serial;
owner = serial->type->driver.owner;
- mutex_lock(&serial->disc_mutex);
- if (!serial->disconnected)
- usb_autopm_put_interface(serial->interface);
- mutex_unlock(&serial->disc_mutex);
+ usb_autopm_put_interface(serial->interface);
usb_serial_put(serial);
module_put(owner);
@@ -396,6 +396,24 @@
port->serial->type->unthrottle(tty);
}
+static int serial_get_serial(struct tty_struct *tty, struct serial_struct *ss)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ if (port->serial->type->get_serial)
+ return port->serial->type->get_serial(tty, ss);
+ return -ENOTTY;
+}
+
+static int serial_set_serial(struct tty_struct *tty, struct serial_struct *ss)
+{
+ struct usb_serial_port *port = tty->driver_data;
+
+ if (port->serial->type->set_serial)
+ return port->serial->type->set_serial(tty, ss);
+ return -ENOTTY;
+}
+
static int serial_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
@@ -1177,6 +1195,8 @@
.tiocmget = serial_tiocmget,
.tiocmset = serial_tiocmset,
.get_icount = serial_get_icount,
+ .set_serial = serial_set_serial,
+ .get_serial = serial_get_serial,
.cleanup = serial_cleanup,
.install = serial_install,
.proc_show = serial_proc_show,