2 files changed, 5 insertions, 5 deletions

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 8c2d531eedea..b157c48e8b78 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -122,9 +122,6 @@ static void return_serial(struct usb_serial *serial)
 
         dbg("%s", __func__);
 
-        if (serial == NULL)
-                return;
-
         for (i = 0; i < serial->num_ports; ++i)
                 serial_table[serial->minor + i] = NULL;
 }
@@ -142,7 +139,8 @@ static void destroy_serial(struct kref *kref)
         serial->type->shutdown(serial);
 
         /* return the minor range that this device had */
-        return_serial(serial);
+        if (serial->minor != SERIAL_TTY_NO_MINOR)
+                return_serial(serial);
 
         for (i = 0; i < serial->num_ports; ++i)
                 serial->port[i]->port.count = 0;
@@ -575,6 +573,7 @@ static struct usb_serial *create_serial(struct usb_device *dev,
         serial->interface = interface;
         kref_init(&serial->kref);
         mutex_init(&serial->disc_mutex);
+        serial->minor = SERIAL_TTY_NO_MINOR;
 
         return serial;
 }
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index 09a3e6a7518f..655341d0f534 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -17,7 +17,8 @@
 #include <linux/mutex.h>
 
 #define SERIAL_TTY_MAJOR        188     /* Nice legal number now */
-#define SERIAL_TTY_MINORS       255     /* loads of devices :) */
+#define SERIAL_TTY_MINORS       254     /* loads of devices :) */
+#define SERIAL_TTY_NO_MINOR     255     /* No minor was assigned */
 
 /* The maximum number of ports one device can grab at once */
 #define MAX_NUM_PORTS           8