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.
> rc = usb_submit_urb(port->read_urb, GFP_ATOMIC);
> }
> ......
> }
>
> finally, we wanna unlink the read_urb in the close function, and it blocks:
>
> mxu2s_close() {
> ......
> if(serial->dev) {
> printk("unlinking...\n");
> usb_unlink_urb(priv->read_urb);
> printk("unlink finished\n"); // <-- you'll never see
> this in kmsg
Are you sure you are checking the status in the callback to make sure
you don't resubmit it? That is sounding like what you are doing.
> }
> .......
> }
>
> we have not try the 2.6.12-rc5 or 2.6.11 version, cause many of our
> customers may hope
> to use it under the default S/W environment, which means we are asked to
> support distributions
> like Fedora core 2, core 3 or others..... :~
>
> I'm afraid too many codes taking you too much time, so I cut off and make
> this short.
> If you'd like to check in detail, please feel free to contact me.
Sure, have a pointer to your whole driver? It is released under the
GPL, right?
For what usb to serial device is this driver being written for?
thanks,
greg k-h
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