1 files changed, 11 insertions, 5 deletions

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index de9111d97a58..92200f05b531 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -168,6 +168,11 @@ static void destroy_serial(struct kref *kref)
         kfree (serial);
 }
 
+void usb_serial_put(struct usb_serial *serial)
+{
+        kref_put(&serial->kref, destroy_serial);
+}
+
 /*****************************************************************************
  * Driver tty interface functions
  *****************************************************************************/
@@ -232,7 +237,7 @@ bailout_mutex_unlock:
         port->open_count = 0;
         mutex_unlock(&port->mutex);
 bailout_kref_put:
-        kref_put(&serial->kref, destroy_serial);
+        usb_serial_put(serial);
         return retval;
 }
 
@@ -268,7 +273,7 @@ static void serial_close(struct tty_struct *tty, struct file * filp)
         }
 
         mutex_unlock(&port->mutex);
-        kref_put(&port->serial->kref, destroy_serial);
+        usb_serial_put(port->serial);
 }
 
 static int serial_write (struct tty_struct * tty, const unsigned char *buf, int count)
@@ -276,7 +281,7 @@ static int serial_write (struct tty_struct * tty, const unsigned char *buf, int
         struct usb_serial_port *port = tty->driver_data;
         int retval = -EINVAL;
 
-        if (!port)
+        if (!port || port->serial->dev->state == USB_STATE_NOTATTACHED)
                 goto exit;
 
         dbg("%s - port %d, %d byte(s)", __FUNCTION__, port->number, count);
@@ -473,7 +478,7 @@ static int serial_read_proc (char *page, char **start, off_t off, int count, int
                         begin += length;
                         length = 0;
                 }
-                kref_put(&serial->kref, destroy_serial);
+                usb_serial_put(serial);
         }
         *eof = 1;
 done:
@@ -985,6 +990,7 @@ void usb_serial_disconnect(struct usb_interface *interface)
         struct device *dev = &interface->dev;
         struct usb_serial_port *port;
 
+        usb_serial_console_disconnect(serial);
         dbg ("%s", __FUNCTION__);
 
         usb_set_intfdata (interface, NULL);
@@ -996,7 +1002,7 @@ void usb_serial_disconnect(struct usb_interface *interface)
                 }
                 /* let the last holder of this object 
                  * cause it to be cleaned up */
-                kref_put(&serial->kref, destroy_serial);
+                usb_serial_put(serial);
         }
         dev_info(dev, "device disconnected\n");
 }