1 files changed, 8 insertions, 11 deletions

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)