usb_ep_dequeue man page on Scientific

usb_ep_dequeue man page on Scientific

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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 2.6.	 November 2013		     USB_EP_DEQUEUE(9)

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