diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
index 63f7cc4..7b8815d 100644
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -486,12 +486,22 @@
 	if (actual_length >= 4) {
 		struct ch341_private *priv = usb_get_serial_port_data(port);
 		unsigned long flags;
+		u8 prev_line_status = priv->line_status;
 
 		spin_lock_irqsave(&priv->lock, flags);
 		priv->line_status = (~(data[2])) & CH341_BITS_MODEM_STAT;
 		if ((data[1] & CH341_MULT_STAT))
 			priv->multi_status_change = 1;
 		spin_unlock_irqrestore(&priv->lock, flags);
+
+		if ((priv->line_status ^ prev_line_status) & CH341_BIT_DCD) {
+			struct tty_struct *tty = tty_port_tty_get(&port->port);
+			if (tty)
+				usb_serial_handle_dcd_change(port, tty,
+					    priv->line_status & CH341_BIT_DCD);
+			tty_kref_put(tty);
+		}
+
 		wake_up_interruptible(&priv->delta_msr_wait);
 	}
 
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index c3bea46..735ea03 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -49,7 +49,6 @@
 static void cp210x_break_ctl(struct tty_struct *, int);
 static int cp210x_startup(struct usb_serial *);
 static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
-static int cp210x_carrier_raised(struct usb_serial_port *p);
 
 static int debug;
 
@@ -166,8 +165,7 @@
 	.tiocmget 		= cp210x_tiocmget,
 	.tiocmset		= cp210x_tiocmset,
 	.attach			= cp210x_startup,
-	.dtr_rts		= cp210x_dtr_rts,
-	.carrier_raised		= cp210x_carrier_raised
+	.dtr_rts		= cp210x_dtr_rts
 };
 
 /* Config request types */
@@ -766,15 +764,6 @@
 	return result;
 }
 
-static int cp210x_carrier_raised(struct usb_serial_port *p)
-{
-	unsigned int control;
-	cp210x_get_config(p, CP210X_GET_MDMSTS, &control, 1);
-	if (control & CONTROL_DCD)
-		return 1;
-	return 0;
-}
-
 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 {
 	struct usb_serial_port *port = tty->driver_data;
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index b92070c..666e5a6 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -455,7 +455,6 @@
 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);
-static int digi_carrier_raised(struct usb_serial_port *port);
 static void digi_dtr_rts(struct usb_serial_port *port, int on);
 static int digi_startup_device(struct usb_serial *serial);
 static int digi_startup(struct usb_serial *serial);
@@ -511,7 +510,6 @@
 	.open =				digi_open,
 	.close =			digi_close,
 	.dtr_rts =			digi_dtr_rts,
-	.carrier_raised =		digi_carrier_raised,
 	.write =			digi_write,
 	.write_room =			digi_write_room,
 	.write_bulk_callback = 		digi_write_bulk_callback,
@@ -1339,14 +1337,6 @@
 	digi_set_modem_signals(port, on * (TIOCM_DTR|TIOCM_RTS), 1);
 }
 
-static int digi_carrier_raised(struct usb_serial_port *port)
-{
-	struct digi_port *priv = usb_get_serial_port_data(port);
-	if (priv->dp_modem_signals & TIOCM_CD)
-		return 1;
-	return 0;
-}
-
 static int digi_open(struct tty_struct *tty, struct usb_serial_port *port)
 {
 	int ret;
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index e6833e2..e4db5ad 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -479,6 +479,26 @@
 }
 EXPORT_SYMBOL_GPL(usb_serial_handle_break);
 
+/**
+ *	usb_serial_handle_dcd_change - handle a change of carrier detect state
+ *	@port: usb_serial_port structure for the open port
+ *	@tty: tty_struct structure for the port
+ *	@status: new carrier detect status, nonzero if active
+ */
+void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port,
+				struct tty_struct *tty, unsigned int status)
+{
+	struct tty_port *port = &usb_port->port;
+
+	dbg("%s - port %d, status %d", __func__, usb_port->number, status);
+
+	if (status)
+		wake_up_interruptible(&port->open_wait);
+	else if (tty && !C_CLOCAL(tty))
+		tty_hangup(tty);
+}
+EXPORT_SYMBOL_GPL(usb_serial_handle_dcd_change);
+
 int usb_serial_generic_resume(struct usb_serial *serial)
 {
 	struct usb_serial_port *port;
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c
index a10dd56..554a869 100644
--- a/drivers/usb/serial/keyspan_pda.c
+++ b/drivers/usb/serial/keyspan_pda.c
@@ -679,22 +679,6 @@
 	}
 }
 
-static int keyspan_pda_carrier_raised(struct usb_serial_port *port)
-{
-	struct usb_serial *serial = port->serial;
-	unsigned char modembits;
-
-	/* If we can read the modem status and the DCD is low then
-	   carrier is not raised yet */
-	if (keyspan_pda_get_modem_info(serial, &modembits) >= 0) {
-		if (!(modembits & (1>>6)))
-			return 0;
-	}
-	/* Carrier raised, or we failed (eg disconnected) so
-	   progress accordingly */
-	return 1;
-}
-
 
 static int keyspan_pda_open(struct tty_struct *tty,
 					struct usb_serial_port *port)
@@ -881,7 +865,6 @@
 	.id_table =		id_table_std,
 	.num_ports =		1,
 	.dtr_rts =		keyspan_pda_dtr_rts,
-	.carrier_raised	=	keyspan_pda_carrier_raised,
 	.open =			keyspan_pda_open,
 	.close =		keyspan_pda_close,
 	.write =		keyspan_pda_write,
diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index 45c40e6..08c9181 100644
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -678,9 +678,11 @@
 {
 
 	struct pl2303_private *priv = usb_get_serial_port_data(port);
+	struct tty_struct *tty;
 	unsigned long flags;
 	u8 status_idx = UART_STATE;
 	u8 length = UART_STATE + 1;
+	u8 prev_line_status;
 	u16 idv, idp;
 
 	idv = le16_to_cpu(port->serial->dev->descriptor.idVendor);
@@ -702,11 +704,20 @@
 
 	/* Save off the uart status for others to look at */
 	spin_lock_irqsave(&priv->lock, flags);
+	prev_line_status = priv->line_status;
 	priv->line_status = data[status_idx];
 	spin_unlock_irqrestore(&priv->lock, flags);
 	if (priv->line_status & UART_BREAK_ERROR)
 		usb_serial_handle_break(port);
 	wake_up_interruptible(&priv->delta_msr_wait);
+
+	tty = tty_port_tty_get(&port->port);
+	if (!tty)
+		return;
+	if ((priv->line_status ^ prev_line_status) & UART_DCD)
+		usb_serial_handle_dcd_change(port, tty,
+				priv->line_status & UART_DCD);
+	tty_kref_put(tty);
 }
 
 static void pl2303_read_int_callback(struct urb *urb)
diff --git a/drivers/usb/serial/spcp8x5.c b/drivers/usb/serial/spcp8x5.c
index c7665d3..cbfb70b 100644
--- a/drivers/usb/serial/spcp8x5.c
+++ b/drivers/usb/serial/spcp8x5.c
@@ -133,7 +133,7 @@
 
 /* how come ??? */
 #define UART_STATE			0x08
-#define UART_STATE_TRANSIENT_MASK	0x74
+#define UART_STATE_TRANSIENT_MASK	0x75
 #define UART_DCD			0x01
 #define UART_DSR			0x02
 #define UART_BREAK_ERROR		0x04
@@ -525,6 +525,10 @@
 		/* overrun is special, not associated with a char */
 		if (status & UART_OVERRUN_ERROR)
 			tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+
+		if (status & UART_DCD)
+			usb_serial_handle_dcd_change(port, tty,
+				   priv->line_status & MSR_STATUS_LINE_DCD);
 	}
 
 	tty_insert_flip_string_fixed_flag(tty, data, tty_flag,