.\" This documentation was generated from the book titled "USB Gadget API for Linux", which is part of the Linux kernel source.
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.\" Documentation copyright: 2003 David Brownell 
.\" Documentation by: David Brownell (dbrownell@users.sourceforge.net)
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.TH "USB_EP_DEQUEUE" "9" "14 August 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
This documentation was generated with kernel version 2.6.0.