usb_hcd_link_urb_to_ep — add an URB to its endpoint queue
int usb_hcd_link_urb_to_ep ( | struct usb_hcd * | hcd, |
| struct urb * | urb); |
Host controller drivers should call this routine in their enqueue
method. The HCD's private spinlock must be held and interrupts must
be disabled. The actions carried out here are required for URB
submission, as well as for endpoint shutdown and for usb_kill_urb.
Returns 0 for no error, otherwise a negative error code (in which case
the enqueue method must fail). If no error occurs but enqueue fails
anyway, it must call usb_hcd_unlink_urb_from_ep before releasing
the private spinlock and returning.