other versions
- wheezy 3.2.78-1
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 endpointSYNOPSIS¶
int
usb_ep_dequeue(struct usb_ep * ep,
struct usb_request * req);
ARGUMENTS¶
epthe 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¶
March 2016 | Kernel Hackers Manual 3.2. |