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.TH "USB_EP_DEQUEUE" "9" "09 April 2004" "" ""

.SH NAME
usb_ep_dequeue \- dequeues (cancels, unlinks) an I/O request from an endpoint
.SH SYNOPSIS
.sp
\fB
.sp
int usb_ep_dequeue  (struct usb_ep * \fIep\fB, struct usb_request * \fIreq\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIep\fB\fR
the endpoint associated with the request
.TP
\fB\fIreq\fB\fR
the request being canceled
.SH "DESCRIPTION"
.PP
if the request is still active on the endpoint, it is dequeued and its
completion routine is called (with status -ECONNRESET); else a negative
error code is returned.
.PP
note that some hardware can't clear out write fifos (to unlink the request
at the head of the queue) except as part of disconnecting from usb.  such
restrictions prevent drivers from supporting configuration changes,
even to configuration zero (a ``chapter 9'' requirement).
.SH "ABOUT THIS DOCUMENT"
.PP
This documentation is free software; you can redistribute
it and/or modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later
version.
.PP
This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
.PP
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
MA 02111-1307 USA
.PP
For more details see the file COPYING in the source
distribution of Linux.
.PP
If you have comments on the formatting of this manpage, then please contact
Michael Still (mikal@stillhq.com).
.PP
This documentation was generated with kernel version 2.6.0.