Man page 9 : usb_hcd_giveback_urb

usb_hcd_giveback_urb - return URB from HCD to device driver

void usb_hcd_giveback_urb(struct usb_hcd *  hcd , struct urb *  urb , int  status );

hcd
    host controller returning the URB

urb
    urb being returned to the USB device driver.

status
    completion status code for the URB.

in_interrupt

This hands the URB from HCD to its USB device driver, using its completion function. The HCD has freed all per-urb resources (and is done using urb->hcpriv). It also released all HCD locks; the device driver wonAqt cause problems if it frees, modifies, or resubmits this URB.

If urb was unlinked, the value of status will be overridden by urb->unlinked. Erroneous short transfers are detected in case the HCD hasnAqt checked for them.