usb_serial: Kill port mutex

The tty port has a port mutex used for all the port related locking so we
don't need the one in the USB serial layer any more.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 2 insertions, 6 deletions

diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index 80f59b6350cb..c03fdc0242dd 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -501,12 +501,12 @@ static int opticon_resume(struct usb_interface *intf)
         struct usb_serial_port *port = serial->port[0];
         int result;
 
-        mutex_lock(&port->mutex);
+        mutex_lock(&port->port.mutex);
         if (port->port.count)
                 result = usb_submit_urb(priv->bulk_read_urb, GFP_NOIO);
         else
                 result = 0;
-        mutex_unlock(&port->mutex);
+        mutex_unlock(&port->port.mutex);
         return result;
 }
 
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 829a46684e1d..4543f359be75 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -897,7 +897,6 @@ int usb_serial_probe(struct usb_interface *interface,
                 spin_lock_init(&port->lock);
                 /* Keep this for private driver use for the moment but
                    should probably go away */
-                mutex_init(&port->mutex);
                 INIT_WORK(&port->work, usb_serial_port_work);
                 serial->port[i] = port;
                 port->dev.parent = &interface->dev;
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index ce911ebf91e8..acf6e457c04b 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -39,8 +39,6 @@ enum port_dev_state {
  * @serial: pointer back to the struct usb_serial owner of this port.
  * @port: pointer to the corresponding tty_port for this port.
  * @lock: spinlock to grab when updating portions of this structure.
- * @mutex: mutex used to synchronize serial_open() and serial_close()
- *      access for this port.
  * @number: the number of the port (the minor number).
  * @interrupt_in_buffer: pointer to the interrupt in buffer for this port.
  * @interrupt_in_urb: pointer to the interrupt in struct urb for this port.
@@ -77,7 +75,6 @@ struct usb_serial_port {
         struct usb_serial       *serial;
         struct tty_port         port;
         spinlock_t              lock;
-        struct mutex            mutex;
         unsigned char           number;
 
         unsigned char           *interrupt_in_buffer;