'\" t
.\"     Title: usb_ep_dequeue
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: May 2018
.\"    Manual: Kernel Mode Gadget API
.\"    Source: Kernel Hackers Manual 3.16.56
.\"  Language: English
.\"
.TH "USB_EP_DEQUEUE" "9" "May 2018" "Kernel Hackers Manual 3\&.16\&" "Kernel Mode Gadget API"
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.SH "NAME"
usb_ep_dequeue \- dequeues (cancels, unlinks) an I/O request from an endpoint
.SH "SYNOPSIS"
.HP \w'int\ usb_ep_dequeue('u
.BI "int usb_ep_dequeue(struct\ usb_ep\ *\ " "ep" ", struct\ usb_request\ *\ " "req" ");"
.SH "ARGUMENTS"
.PP
\fIep\fR
.RS 4
the endpoint associated with the request
.RE
.PP
\fIreq\fR
.RS 4
the request being canceled
.RE
.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\*(Aqt 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
\(lqchapter 9\(rq
requirement)\&.
.SH "AUTHOR"
.PP
\fBDavid Brownell\fR <\&dbrownell@users.sourceforge.net\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br