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

On 4/24/07, Oliver Neukum <[email protected]> wrote:
> Am Dienstag, 24. April 2007 11:46 schrieb Wael Adel:
> >         retval = usb_submit_urb(urb, GFP_KERNEL);
> >         if (retval) {
> >                 err("%s - failed submitting write urb, error %d",
> __FUNCTION__, retval);
> >                 goto error;
> >         }
> >
> >         if (buf != NULL)
> >         {
> >                 if (copy_to_user(user_buffer, buf , readsize))
> >                 {
> >                         retval = -EFAULT;
> >                         goto error;
> >                 }
> >         }
>
> You are copying the the buffer to user space without waiting for the
> URB to be executed. That cannot work.

so how can i wait for the urb to be executed then copying the data to
the user space?
is there a flag that i should loop on it or what?

>
> 	Regards
> 		Oliver
> --
> SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)
> This signature is a legal requirement
>

-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/
_______________________________________________
[email protected]
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-devel