USB_EP_DEQUEUE(9) Kernel Mode Gadget API USB_EP_DEQUEUE(9)
NAME
usb_ep_dequeue - dequeues (cancels, unlinks) an I/O request from an endpoint
SYNOPSIS
int usb_ep_dequeue(struct usb_ep * ep, struct usb_request * req);
ARGUMENTS
ep
the endpoint associated with the request
req
the request being canceled
DESCRIPTION
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.
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).
AUTHOR
David Brownell <dbrownell@users.sourceforge.net>
Author.
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 USB_EP_DEQUEUE(9)
