Merge tag 'usb-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

Pull USB patches from Greg Kroah-Hartman:
 "Here's the big USB merge for 3.9-rc1

  Nothing major, lots of gadget fixes, and of course, xhci stuff.

  All of this has been in linux-next for a while, with the exception of
  the last 3 patches, which were reverts of patches in the tree that
  caused problems, they went in yesterday."

* tag 'usb-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (190 commits)
  Revert "USB: EHCI: make ehci-vt8500 a separate driver"
  Revert "USB: EHCI: make ehci-orion a separate driver"
  Revert "USB: update host controller Kconfig entries"
  USB: update host controller Kconfig entries
  USB: EHCI: make ehci-orion a separate driver
  USB: EHCI: make ehci-vt8500 a separate driver
  USB: usb-storage: unusual_devs update for Super TOP SATA bridge
  USB: ehci-omap: Fix autoloading of module
  USB: ehci-omap: Don't free gpios that we didn't request
  USB: option: add Huawei "ACM" devices using protocol = vendor
  USB: serial: fix null-pointer dereferences on disconnect
  USB: option: add Yota / Megafon M100-1 4g modem
  drivers/usb: add missing GENERIC_HARDIRQS dependencies
  USB: storage: properly handle the endian issues of idProduct
  testusb: remove all mentions of 'usbfs'
  usb: gadget: imx_udc: make it depend on BROKEN
  usb: omap_control_usb: fix compile warning
  ARM: OMAP: USB: Add phy binding information
  ARM: OMAP2: MUSB: Specify omap4 has mailbox
  ARM: OMAP: devices: create device for usb part of control module
  ...

13 files changed, 198 insertions, 133 deletions

diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig
index 76f462241738..dad8363e5b2a 100644
--- a/drivers/usb/serial/Kconfig
+++ b/drivers/usb/serial/Kconfig
@@ -647,6 +647,18 @@ config USB_SERIAL_VIVOPAY_SERIAL
           To compile this driver as a module, choose M here: the
           module will be called vivopay-serial.
 
+config USB_SERIAL_XSENS_MT
+	tristate "Xsens motion tracker serial interface driver"
+	help
+	  Say Y here if you want to use Xsens motion trackers.
+
+	  This driver supports the new generation of motion trackers
+	  by Xsens. Older devices can be accessed using the FTDI_SIO
+	  driver.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called xsens_mt.
+
 config USB_SERIAL_ZIO
 	tristate "ZIO Motherboard USB serial interface driver"
 	help
diff --git a/drivers/usb/serial/Makefile b/drivers/usb/serial/Makefile
index 3b3e7308d476..eaf5ca14dfeb 100644
--- a/drivers/usb/serial/Makefile
+++ b/drivers/usb/serial/Makefile
@@ -61,5 +61,6 @@ obj-$(CONFIG_USB_SERIAL_VISOR)			+= visor.o
 obj-$(CONFIG_USB_SERIAL_WHITEHEAT)		+= whiteheat.o
 obj-$(CONFIG_USB_SERIAL_XIRCOM)			+= keyspan_pda.o
 obj-$(CONFIG_USB_SERIAL_VIVOPAY_SERIAL)		+= vivopay-serial.o
+obj-$(CONFIG_USB_SERIAL_XSENS_MT)		+= xsens_mt.o
 obj-$(CONFIG_USB_SERIAL_ZIO)			+= zio.o
 obj-$(CONFIG_USB_SERIAL_ZTE)			+= zte_ev.o
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 90ceef1776c3..d07fccf3bab5 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1886,24 +1886,22 @@ static void ftdi_dtr_rts(struct usb_serial_port *port, int on)
 {
 	struct ftdi_private *priv = usb_get_serial_port_data(port);
 
-	mutex_lock(&port->serial->disc_mutex);
-	if (!port->serial->disconnected) {
-		/* Disable flow control */
-		if (!on && usb_control_msg(port->serial->dev,
+	/* Disable flow control */
+	if (!on) {
+		if (usb_control_msg(port->serial->dev,
 			    usb_sndctrlpipe(port->serial->dev, 0),
 			    FTDI_SIO_SET_FLOW_CTRL_REQUEST,
 			    FTDI_SIO_SET_FLOW_CTRL_REQUEST_TYPE,
 			    0, priv->interface, NULL, 0,
 			    WDR_TIMEOUT) < 0) {
-			    dev_err(&port->dev, "error from flowcontrol urb\n");
+			dev_err(&port->dev, "error from flowcontrol urb\n");
 		}
-		/* drop RTS and DTR */
-		if (on)
-			set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
-		else
-			clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
 	}
-	mutex_unlock(&port->serial->disc_mutex);
+	/* drop RTS and DTR */
+	if (on)
+		set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
+	else
+		clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
 }
 
 /*
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index 82afc4d6a327..641ab3da2d83 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -521,65 +521,6 @@ exit_is_tx_active:
 	return bytes_left;
 }
 
-static void chase_port(struct edgeport_port *port, unsigned long timeout,
-								int flush)
-{
-	int baud_rate;
-	struct tty_struct *tty = tty_port_tty_get(&port->port->port);
-	struct usb_serial *serial = port->port->serial;
-	wait_queue_t wait;
-	unsigned long flags;
-
-	if (!tty)
-		return;
-
-	if (!timeout)
-		timeout = (HZ * EDGE_CLOSING_WAIT)/100;
-
-	/* wait for data to drain from the buffer */
-	spin_lock_irqsave(&port->ep_lock, flags);
-	init_waitqueue_entry(&wait, current);
-	add_wait_queue(&tty->write_wait, &wait);
-	for (;;) {
-		set_current_state(TASK_INTERRUPTIBLE);
-		if (kfifo_len(&port->write_fifo) == 0
-		|| timeout == 0 || signal_pending(current)
-		|| serial->disconnected)
-			/* disconnect */
-			break;
-		spin_unlock_irqrestore(&port->ep_lock, flags);
-		timeout = schedule_timeout(timeout);
-		spin_lock_irqsave(&port->ep_lock, flags);
-	}
-	set_current_state(TASK_RUNNING);
-	remove_wait_queue(&tty->write_wait, &wait);
-	if (flush)
-		kfifo_reset_out(&port->write_fifo);
-	spin_unlock_irqrestore(&port->ep_lock, flags);
-	tty_kref_put(tty);
-
-	/* wait for data to drain from the device */
-	timeout += jiffies;
-	while ((long)(jiffies - timeout) < 0 && !signal_pending(current)
-						&& !serial->disconnected) {
-		/* not disconnected */
-		if (!tx_active(port))
-			break;
-		msleep(10);
-	}
-
-	/* disconnected */
-	if (serial->disconnected)
-		return;
-
-	/* wait one more character time, based on baud rate */
-	/* (tx_active doesn't seem to wait for the last byte) */
-	baud_rate = port->baud_rate;
-	if (baud_rate == 0)
-		baud_rate = 50;
-	msleep(max(1, DIV_ROUND_UP(10000, baud_rate)));
-}
-
 static int choose_config(struct usb_device *dev)
 {
 	/*
@@ -1944,6 +1885,8 @@ static int edge_open(struct tty_struct *tty, struct usb_serial_port *port)
 
 	++edge_serial->num_ports_open;
 
+	port->port.drain_delay = 1;
+
 	goto release_es_lock;
 
 unlink_int_urb:
@@ -1959,6 +1902,7 @@ static void edge_close(struct usb_serial_port *port)
 	struct edgeport_serial *edge_serial;
 	struct edgeport_port *edge_port;
 	struct usb_serial *serial = port->serial;
+	unsigned long flags;
 	int port_number;
 
 	edge_serial = usb_get_serial_data(port->serial);
@@ -1970,12 +1914,12 @@ static void edge_close(struct usb_serial_port *port)
 	 * this flag and dump add read data */
 	edge_port->close_pending = 1;
 
-	/* chase the port close and flush */
-	chase_port(edge_port, (HZ * closing_wait) / 100, 1);
-
 	usb_kill_urb(port->read_urb);
 	usb_kill_urb(port->write_urb);
 	edge_port->ep_write_urb_in_use = 0;
+	spin_lock_irqsave(&edge_port->ep_lock, flags);
+	kfifo_reset_out(&edge_port->write_fifo);
+	spin_unlock_irqrestore(&edge_port->ep_lock, flags);
 
 	/* assuming we can still talk to the device,
 	 * send a close port command to it */
@@ -2101,16 +2045,21 @@ static int edge_chars_in_buffer(struct tty_struct *tty)
 	struct edgeport_port *edge_port = usb_get_serial_port_data(port);
 	int chars = 0;
 	unsigned long flags;
+	int ret;
 
 	if (edge_port == NULL)
 		return 0;
-	if (edge_port->close_pending == 1)
-		return 0;
 
 	spin_lock_irqsave(&edge_port->ep_lock, flags);
 	chars = kfifo_len(&edge_port->write_fifo);
 	spin_unlock_irqrestore(&edge_port->ep_lock, flags);
 
+	if (!chars) {
+		ret = tx_active(edge_port);
+		if (ret > 0)
+			chars = ret;
+	}
+
 	dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
 	return chars;
 }
@@ -2448,10 +2397,15 @@ static int get_serial_info(struct edgeport_port *edge_port,
 				struct serial_struct __user *retinfo)
 {
 	struct serial_struct tmp;
+	unsigned cwait;
 
 	if (!retinfo)
 		return -EFAULT;
 
+	cwait = edge_port->port->port.closing_wait;
+	if (cwait != ASYNC_CLOSING_WAIT_NONE)
+		cwait = jiffies_to_msecs(closing_wait) / 10;
+
 	memset(&tmp, 0, sizeof(tmp));
 
 	tmp.type		= PORT_16550A;
@@ -2462,7 +2416,7 @@ static int get_serial_info(struct edgeport_port *edge_port,
 	tmp.xmit_fifo_size	= edge_port->port->bulk_out_size;
 	tmp.baud_base		= 9600;
 	tmp.close_delay		= 5*HZ;
-	tmp.closing_wait	= closing_wait;
+	tmp.closing_wait	= cwait;
 
 	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 		return -EFAULT;
@@ -2517,8 +2471,7 @@ static void edge_break(struct tty_struct *tty, int break_state)
 	int status;
 	int bv = 0;	/* Off */
 
-	/* chase the port close */
-	chase_port(edge_port, 0, 0);
+	tty_wait_until_sent(tty, 0);
 
 	if (break_state == -1)
 		bv = 1;	/* On */
@@ -2591,6 +2544,8 @@ static int edge_port_probe(struct usb_serial_port *port)
 		return ret;
 	}
 
+	port->port.closing_wait = msecs_to_jiffies(closing_wait * 10);
+
 	return 0;
 }
 
diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c
index 97bc49f68efd..3d95637f3d68 100644
--- a/drivers/usb/serial/keyspan.c
+++ b/drivers/usb/serial/keyspan.c
@@ -298,7 +298,7 @@ static void	usa26_indat_callback(struct urb *urb)
 	endpoint = usb_pipeendpoint(urb->pipe);
 
 	if (status) {
-		dev_dbg(&urb->dev->dev,"%s - nonzero status: %x on endpoint %d.\n",
+		dev_dbg(&urb->dev->dev, "%s - nonzero status: %x on endpoint %d.\n",
 			__func__, status, endpoint);
 		return;
 	}
@@ -532,7 +532,7 @@ static void	usa28_instat_callback(struct urb *urb)
 
 	/*
 	dev_dbg(&urb->dev->dev,
-	  	"%s %x %x %x %x %x %x %x %x %x %x %x %x", __func__,
+		"%s %x %x %x %x %x %x %x %x %x %x %x %x", __func__,
 		data[0], data[1], data[2], data[3], data[4], data[5],
 		data[6], data[7], data[8], data[9], data[10], data[11]);
 	*/
diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index b6911757c855..d9c86516fed4 100644
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -499,19 +499,15 @@ static void mct_u232_dtr_rts(struct usb_serial_port *port, int on)
 	unsigned int control_state;
 	struct mct_u232_private *priv = usb_get_serial_port_data(port);
 
-	mutex_lock(&port->serial->disc_mutex);
-	if (!port->serial->disconnected) {
-		/* drop DTR and RTS */
-		spin_lock_irq(&priv->lock);
-		if (on)
-			priv->control_state |= TIOCM_DTR | TIOCM_RTS;
-		else
-			priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
-		control_state = priv->control_state;
-		spin_unlock_irq(&priv->lock);
-		mct_u232_set_modem_ctrl(port, control_state);
-	}
-	mutex_unlock(&port->serial->disc_mutex);
+	spin_lock_irq(&priv->lock);
+	if (on)
+		priv->control_state |= TIOCM_DTR | TIOCM_RTS;
+	else
+		priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
+	control_state = priv->control_state;
+	spin_unlock_irq(&priv->lock);
+
+	mct_u232_set_modem_ctrl(port, control_state);
 }
 
 static void mct_u232_close(struct usb_serial_port *port)
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index 567bc77d6397..f7d339d8187b 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -479,6 +479,7 @@ static const struct option_blacklist_info four_g_w14_blacklist = {
 
 static const struct option_blacklist_info alcatel_x200_blacklist = {
 	.sendsetup = BIT(0) | BIT(1),
+	.reserved = BIT(4),
 };
 
 static const struct option_blacklist_info zte_0037_blacklist = {
@@ -575,8 +576,14 @@ static const struct usb_device_id option_ids[] = {
 	{ USB_DEVICE(QUANTA_VENDOR_ID, QUANTA_PRODUCT_GLX) },
 	{ USB_DEVICE(QUANTA_VENDOR_ID, QUANTA_PRODUCT_GKE) },
 	{ USB_DEVICE(QUANTA_VENDOR_ID, QUANTA_PRODUCT_GLE) },
+	{ USB_DEVICE(QUANTA_VENDOR_ID, 0xea42),
+		.driver_info = (kernel_ulong_t)&net_intf4_blacklist },
+	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, 0x1c05, USB_CLASS_COMM, 0x02, 0xff) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, 0x1c23, USB_CLASS_COMM, 0x02, 0xff) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, HUAWEI_PRODUCT_E173, 0xff, 0xff, 0xff),
 		.driver_info = (kernel_ulong_t) &net_intf1_blacklist },
+	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, 0x1441, USB_CLASS_COMM, 0x02, 0xff) },
+	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, 0x1442, USB_CLASS_COMM, 0x02, 0xff) },
 	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, HUAWEI_PRODUCT_K4505, 0xff, 0xff, 0xff),
 		.driver_info = (kernel_ulong_t) &huawei_cdc12_blacklist },
 	{ USB_DEVICE_AND_INTERFACE_INFO(HUAWEI_VENDOR_ID, HUAWEI_PRODUCT_K3765, 0xff, 0xff, 0xff),
@@ -1215,7 +1222,14 @@ static const struct usb_device_id option_ids[] = {
 	{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_X060S_X200),
 	  .driver_info = (kernel_ulong_t)&alcatel_x200_blacklist
 	},
-	{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_X220_X500D) },
+	{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_X220_X500D),
+	  .driver_info = (kernel_ulong_t)&net_intf6_blacklist },
+	{ USB_DEVICE(ALCATEL_VENDOR_ID, 0x0052),
+	  .driver_info = (kernel_ulong_t)&net_intf6_blacklist },
+	{ USB_DEVICE(ALCATEL_VENDOR_ID, 0x00b6),
+	  .driver_info = (kernel_ulong_t)&net_intf3_blacklist },
+	{ USB_DEVICE(ALCATEL_VENDOR_ID, 0x00b7),
+	  .driver_info = (kernel_ulong_t)&net_intf5_blacklist },
 	{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_L100V),
 	  .driver_info = (kernel_ulong_t)&net_intf4_blacklist },
 	{ USB_DEVICE(AIRPLUS_VENDOR_ID, AIRPLUS_PRODUCT_MCD650) },
diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c
index d152be97d041..a8d5110d4cc5 100644
--- a/drivers/usb/serial/quatech2.c
+++ b/drivers/usb/serial/quatech2.c
@@ -945,19 +945,17 @@ static void qt2_dtr_rts(struct usb_serial_port *port, int on)
 	struct usb_device *dev = port->serial->dev;
 	struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 
-	mutex_lock(&port->serial->disc_mutex);
-	if (!port->serial->disconnected) {
-		/* Disable flow control */
-		if (!on && qt2_setregister(dev, port_priv->device_port,
+	/* Disable flow control */
+	if (!on) {
+		if (qt2_setregister(dev, port_priv->device_port,
 					   UART_MCR, 0) < 0)
 			dev_warn(&port->dev, "error from flowcontrol urb\n");
-		/* drop RTS and DTR */
-		if (on)
-			update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
-		else
-			update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
 	}
-	mutex_unlock(&port->serial->disc_mutex);
+	/* drop RTS and DTR */
+	if (on)
+		update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
+	else
+		update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
 }
 
 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index af06f2f5f38b..d4426c038c32 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -861,19 +861,13 @@ static int sierra_open(struct tty_struct *tty, struct usb_serial_port *port)
 
 static void sierra_dtr_rts(struct usb_serial_port *port, int on)
 {
-	struct usb_serial *serial = port->serial;
 	struct sierra_port_private *portdata;
 
 	portdata = usb_get_serial_port_data(port);
 	portdata->rts_state = on;
 	portdata->dtr_state = on;
 
-	if (serial->dev) {
-		mutex_lock(&serial->disc_mutex);
-		if (!serial->disconnected)
-			sierra_send_setup(port);
-		mutex_unlock(&serial->disc_mutex);
-	}
+	sierra_send_setup(port);
 }
 
 static int sierra_startup(struct usb_serial *serial)
diff --git a/drivers/usb/serial/ssu100.c b/drivers/usb/serial/ssu100.c
index 4543ea350229..d938396171e8 100644
--- a/drivers/usb/serial/ssu100.c
+++ b/drivers/usb/serial/ssu100.c
@@ -506,19 +506,16 @@ static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
 {
 	struct usb_device *dev = port->serial->dev;
 
-	mutex_lock(&port->serial->disc_mutex);
-	if (!port->serial->disconnected) {
-		/* Disable flow control */
-		if (!on &&
-		    ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
+	/* Disable flow control */
+	if (!on) {
+		if (ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
 			dev_err(&port->dev, "error from flowcontrol urb\n");
-		/* drop RTS and DTR */
-		if (on)
-			set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
-		else
-			clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 	}
-	mutex_unlock(&port->serial->disc_mutex);
+	/* drop RTS and DTR */
+	if (on)
+		set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
+	else
+		clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 }
 
 static void ssu100_update_msr(struct usb_serial_port *port, u8 msr)
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 64bda135ba7e..a19ed74d770d 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -361,15 +361,21 @@ static int serial_write_room(struct tty_struct *tty)
 static int serial_chars_in_buffer(struct tty_struct *tty)
 {
 	struct usb_serial_port *port = tty->driver_data;
+	struct usb_serial *serial = port->serial;
+	int count = 0;
 
 	dev_dbg(tty->dev, "%s - port %d\n", __func__, port->number);
 
+	mutex_lock(&serial->disc_mutex);
 	/* if the device was unplugged then any remaining characters
 	   fell out of the connector ;) */
-	if (port->serial->disconnected)
-		return 0;
-	/* pass on to the driver specific version of this function */
-	return port->serial->type->chars_in_buffer(tty);
+	if (serial->disconnected)
+		count = 0;
+	else
+		count = serial->type->chars_in_buffer(tty);
+	mutex_unlock(&serial->disc_mutex);
+
+	return count;
 }
 
 static void serial_throttle(struct tty_struct *tty)
@@ -688,10 +694,20 @@ static int serial_carrier_raised(struct tty_port *port)
 static void serial_dtr_rts(struct tty_port *port, int on)
 {
 	struct usb_serial_port *p = container_of(port, struct usb_serial_port, port);
-	struct usb_serial_driver *drv = p->serial->type;
+	struct usb_serial *serial = p->serial;
+	struct usb_serial_driver *drv = serial->type;
 
-	if (drv->dtr_rts)
+	if (!drv->dtr_rts)
+		return;
+	/*
+	 * Work-around bug in the tty-layer which can result in dtr_rts
+	 * being called after a disconnect (and tty_unregister_device
+	 * has returned). Remove once bug has been squashed.
+	 */
+	mutex_lock(&serial->disc_mutex);
+	if (!serial->disconnected)
 		drv->dtr_rts(p, on);
+	mutex_unlock(&serial->disc_mutex);
 }
 
 static const struct tty_port_operations serial_port_ops = {
diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index 01c94aada56c..1355a6cd4508 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -38,7 +38,6 @@
 
 void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
 {
-	struct usb_serial *serial = port->serial;
 	struct usb_wwan_port_private *portdata;
 	struct usb_wwan_intf_private *intfdata;
 
@@ -48,12 +47,11 @@ void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
 		return;
 
 	portdata = usb_get_serial_port_data(port);
-	mutex_lock(&serial->disc_mutex);
+	/* FIXME: locking */
 	portdata->rts_state = on;
 	portdata->dtr_state = on;
-	if (serial->dev)
-		intfdata->send_setup(port);
-	mutex_unlock(&serial->disc_mutex);
+
+	intfdata->send_setup(port);
 }
 EXPORT_SYMBOL(usb_wwan_dtr_rts);
 
diff --git a/drivers/usb/serial/xsens_mt.c b/drivers/usb/serial/xsens_mt.c
new file mode 100644
index 000000000000..1d5798d891bc
--- /dev/null
+++ b/drivers/usb/serial/xsens_mt.c
@@ -0,0 +1,86 @@
+/*
+ * Xsens MT USB driver
+ *
+ * Copyright (C) 2013 Xsens <info@xsens.com>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License version
+ *  2 as published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/tty.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+#include <linux/uaccess.h>
+
+#define XSENS_VID 0x2639
+
+#define MTi_10_IMU_PID		0x0001
+#define MTi_20_VRU_PID		0x0002
+#define MTi_30_AHRS_PID		0x0003
+
+#define MTi_100_IMU_PID		0x0011
+#define MTi_200_VRU_PID		0x0012
+#define MTi_300_AHRS_PID	0x0013
+
+#define MTi_G_700_GPS_INS_PID	0x0017
+
+static const struct usb_device_id id_table[] = {
+	{ USB_DEVICE(XSENS_VID, MTi_10_IMU_PID) },
+	{ USB_DEVICE(XSENS_VID, MTi_20_VRU_PID) },
+	{ USB_DEVICE(XSENS_VID, MTi_30_AHRS_PID) },
+
+	{ USB_DEVICE(XSENS_VID, MTi_100_IMU_PID) },
+	{ USB_DEVICE(XSENS_VID, MTi_200_VRU_PID) },
+	{ USB_DEVICE(XSENS_VID, MTi_300_AHRS_PID) },
+
+	{ USB_DEVICE(XSENS_VID, MTi_G_700_GPS_INS_PID) },
+	{ },
+};
+MODULE_DEVICE_TABLE(usb, id_table);
+
+static int has_required_endpoints(const struct usb_host_interface *interface)
+{
+	__u8 i;
+	int has_bulk_in = 0;
+	int has_bulk_out = 0;
+
+	for (i = 0; i < interface->desc.bNumEndpoints; ++i) {
+		if (usb_endpoint_is_bulk_in(&interface->endpoint[i].desc))
+			has_bulk_in = 1;
+		else if (usb_endpoint_is_bulk_out(&interface->endpoint[i].desc))
+			has_bulk_out = 1;
+	}
+
+	return has_bulk_in && has_bulk_out;
+}
+
+static int xsens_mt_probe(struct usb_serial *serial,
+					const struct usb_device_id *id)
+{
+	if (!has_required_endpoints(serial->interface->cur_altsetting))
+		return -ENODEV;
+	return 0;
+}
+
+static struct usb_serial_driver xsens_mt_device = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "xsens_mt",
+	},
+	.id_table = id_table,
+	.num_ports = 1,
+
+	.probe = xsens_mt_probe,
+};
+
+static struct usb_serial_driver * const serial_drivers[] = {
+	&xsens_mt_device, NULL
+};
+
+module_usb_serial_driver(serial_drivers, id_table);
+
+MODULE_LICENSE("GPL");