1 files changed, 9 insertions, 13 deletions

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)