void usb_serial_generic_read_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
unsigned char *data = urb->transfer_buffer;
int status = urb->status;
unsigned long flags;
dbg("%s - port %d", __func__, port->number);
if (unlikely(status != 0)) {
dbg("%s - nonzero read bulk status received: %d",
__func__, status);
return;
}
usb_serial_debug_data(debug, &port->dev, __func__,
urb->actual_length, data);
/* Throttle the device if requested by tty */
spin_lock_irqsave(&port->lock, flags);
port->throttled = port->throttle_req;
if (!port->throttled) {
spin_unlock_irqrestore(&port->lock, flags);
flush_and_resubmit_read_urb(port);
} else
spin_unlock_irqrestore(&port->lock, flags);
}
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);
}
void usb_serial_generic_unthrottle (struct usb_serial_port *port)
{
int was_throttled;
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
/* Clear the throttle flags */
spin_lock_irqsave(&port->lock, flags);
was_throttled = port->throttled;
port->throttled = port->throttle_req = 0;
spin_unlock_irqrestore(&port->lock, flags);
if (was_throttled) {
/* Handle pending data and resume reading from device */
flush_and_resubmit_read_urb(port);
}
}
void usb_serial_generic_unthrottle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
int was_throttled;
unsigned long flags;
dbg("%s - port %d", __func__, port->number);
/* Clear the throttle flags */
spin_lock_irqsave(&port->lock, flags);
was_throttled = port->throttled;
port->throttled = port->throttle_req = 0;
spin_unlock_irqrestore(&port->lock, flags);
if (was_throttled) {
/* Resume reading from device */
flush_and_resubmit_read_urb(port);
}
}
