+
+void usb_serial_generic_read_bulk_callback (struct urb *urb)
+{
+ struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
+ unsigned char *data = urb->transfer_buffer;
+ int is_throttled;
+ unsigned long flags;
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ if (urb->status) {
+ dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
+ return;
+ }
+
+ usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
+
+ /* Throttle the device if requested by tty */
+ if (urb->actual_length) {
+ spin_lock_irqsave(&port->lock, flags);
+ is_throttled = port->throttled = port->throttle_req;
+ spin_unlock_irqrestore(&port->lock, flags);
+ if (is_throttled) {
+ /* Let the received data linger in the read URB;
+ * usb_serial_generic_unthrottle() will pick it
+ * up later. */
+ dbg("%s - throttling device", __FUNCTION__);
+ return;
+ }
+ }
+
+ /* Handle data and continue reading from device */
+ flush_and_resubmit_read_urb(port);
+}