Am Freitag, 3. Juni 2005 11:10 schrieb Greg KH:
> On Fri, Jun 03, 2005 at 03:24:51PM +0800, Enzo Chen (?????h) wrote:
> >
> > Dear Greg,
> >
> > Thanks for your quick response, we very appreciate it.
> >
> > Our driver is developed based on the usbserial module.
> > The code listed below is our open function:
> >
> > mxu2s_open() {
> > ......
> > if(port->read_urb->status != -EINPROGRESS) {
> > port->read_urb->dev = port->serial->dev;
> > port->read_urb->transfer_buffer_length =
> > URB_TRANSFER_BUFFER_SIZE;
> >
> > usb_fill_bulk_urb(port->read_urb, port->serial->dev,
> > usb_rcvbulkpipe(port->serial->dev,
> > port->bulk_in_endpointAddress),
> > port->read_urb->transfer_buffer,
> > port->read_urb->transfer_buffer_length,
> > mxu2s_read_bulk_callback, port);
> >
> > rc = usb_submit_urb(port->read_urb, GFP_KERNEL);
> > ......
> > }
> >
> > we submit the read_urb here, and then it will be submit again
> > in the read_bulk_callback function :
> >
> > mxu2s_read_bulk_callback() {
> > ......
> > if(port->read_urb->status != -EINPROGRESS) {
>
> This will never be true from within a callback.
On the contrary. It will be always true.
Regards
Oliver
