Name
usb_sg_cancel — 
     stop scatter/gather i/o issued by usb_sg_wait
 
Synopsis
| void usb_sg_cancel ( | struct usb_sg_request * io ); | 
 
Arguments
- io
- 
     request block, initialized with - usb_sg_init
 
Description
   This stops a request after it has been started by usb_sg_wait.
   It can also prevents one initialized by usb_sg_init from starting,
   so that call just frees resources allocated to the request.