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.TH "USB_EP_DEQUEUE" "9" "17 July 2003" "" ""

.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
Permission is granted to copy, distribute, and/or modify
this document under the terms of the GNU Free Documentation
License, version 1.2, or any later version published by the
Free Software Foundation; with the Invariant Sections being
the "GNU Free Documentation License",
no Front-Cover Texts,
and
no Back-Cover Texts.
.PP
This documentation 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 Free Documentation License for more details.
.PP
Note that certain sections of this document are merged
into Linux kernel source code.
That content is the bulk of 
[XRef to CORE]> and
[XRef to UTILS]>,
where the "GNU Free Documentation License" is identified
as an alternate licence for its documentation.
.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 2.5.71.