USB: opticon: use port as urb context

Use port rather than private data as urb context, as the latter may be
accessed as port data, and remove the port field from the private data.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/opticon.c

@@ -40,7 +40,6 @@ MODULE_DEVICE_TABLE(usb, id_table);
 
 /* This structure holds all of the individual device information */
 struct opticon_private {
-	struct usb_serial_port *port;
 	unsigned char *bulk_in_buffer;
 	struct urb *bulk_read_urb;
 	int buffer_size;
@@ -57,9 +56,9 @@ struct opticon_private {
 
 static void opticon_read_bulk_callback(struct urb *urb)
 {
-	struct opticon_private *priv = urb->context;
+	struct usb_serial_port *port = urb->context;
+	struct opticon_private *priv = usb_get_serial_port_data(port);
 	unsigned char *data = urb->transfer_buffer;
-	struct usb_serial_port *port = priv->port;
 	int status = urb->status;
 	struct tty_struct *tty;
 	int result;
@@ -175,7 +174,6 @@ static int opticon_open(struct tty_struct *tty, struct usb_serial_port *port)
 	spin_lock_irqsave(&priv->lock, flags);
 	priv->throttled = false;
 	priv->actually_throttled = false;
-	priv->port = port;
 	priv->rts = false;
 	spin_unlock_irqrestore(&priv->lock, flags);
 
@@ -206,7 +204,8 @@ static void opticon_close(struct usb_serial_port *port)
 
 static void opticon_write_control_callback(struct urb *urb)
 {
-	struct opticon_private *priv = urb->context;
+	struct usb_serial_port *port = urb->context;
+	struct opticon_private *priv = usb_get_serial_port_data(port);
 	int status = urb->status;
 	unsigned long flags;
 
@@ -217,7 +216,7 @@ static void opticon_write_control_callback(struct urb *urb)
 	kfree(urb->setup_packet);
 
 	if (status)
-		dev_dbg(&priv->port->dev,
+		dev_dbg(&port->dev,
 			"%s - non-zero urb status received: %d\n",
 			__func__, status);
 
@@ -225,7 +224,7 @@ static void opticon_write_control_callback(struct urb *urb)
 	--priv->outstanding_urbs;
 	spin_unlock_irqrestore(&priv->lock, flags);
 
-	usb_serial_port_softint(priv->port);
+	usb_serial_port_softint(port);
 }
 
 static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
@@ -285,7 +284,7 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
 	usb_fill_control_urb(urb, serial->dev,
 		usb_sndctrlpipe(serial->dev, 0),
 		(unsigned char *)dr, buffer, count,
-		opticon_write_control_callback, priv);
+		opticon_write_control_callback, port);
 
 	/* send it down the pipe */
 	status = usb_submit_urb(urb, GFP_ATOMIC);
@@ -488,7 +487,6 @@ static int opticon_port_probe(struct usb_serial_port *port)
 		return -ENOMEM;
 
 	spin_lock_init(&priv->lock);
-	priv->port = port;
 
 	priv->bulk_read_urb = usb_alloc_urb(0, GFP_KERNEL);
 	if (!priv->bulk_read_urb)
@@ -505,7 +503,7 @@ static int opticon_port_probe(struct usb_serial_port *port)
 				usb_rcvbulkpipe(serial->dev,
 						priv->bulk_address),
 				priv->bulk_in_buffer, priv->buffer_size,
-				opticon_read_bulk_callback, priv);
+				opticon_read_bulk_callback, port);
 
 	usb_set_serial_port_data(port, priv);