Re: how can i make the skeleton read function blocking function?

here it is the read part of the skeleton driver:

static ssize_t skel_read(struct file *file, char *buffer, size_t
count, loff_t *ppos)
{
	struct usb_skel *dev;
	int retval = -1;
	int bytes_read;

	dev = (struct usb_skel *)file->private_data;
	

	/* do a blocking bulk read to get data from the device */
	retval = usb_bulk_msg(dev->udev,
			      usb_rcvbulkpipe(dev->udev, dev->bulk_in_endpointAddr),
			      dev->bulk_in_buffer,
			      min(dev->bulk_in_size, count),
			      &bytes_read, 0);
		

	/* if the read was successful, copy the data to userspace */
	if (!retval) {
		if (copy_to_user(buffer, dev->bulk_in_buffer, bytes_read))
			retval = -EFAULT;
		else
			retval = bytes_read;
	}

	return retval;
}

note that i found out just from few seconds that the read works right
when it is alone i.e. when the host is sending nothing to the gadget
but if l let the host sends something to the gagdet then the gagdet
sends hello to the host it does not work right and returns 5 in the
first time then it returns -1 forever. i dont know why it should
returns 5 and stops .

On 4/24/07, Oliver Neukum <[email protected]> wrote:
> Am Dienstag, 24. April 2007 19:28 schrieb Wael Adel:
> > > My crystal ball is damp today. Please send the source.
> >
> >
> >
> >
> > here is the total source code of the host side:
>
> I need your driver code. From your description of the output
> it is clear that you are getting errors on subsequent reads. As
> you are not evaluating errno, it is unclear which error it is.
>
> 	Regards
> 		Oliver
>
> --
> SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
> This signature is a legal requirement
>

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