xbd detachment

[David Young <dyoung%pobox.com@localhost>]

I am experimenting with detaching xbd(4) units during shutdown.
xbd_xenbus_detach() hangs in this the loop, below:

        hypervisor_mask_event(sc->sc_evtchn);
        event_remove_handler(sc->sc_evtchn, &xbd_handler, sc);
        while (xengnt_status(sc->sc_ring_gntref)) {
                tsleep(xbd_xenbus_detach, PRIBIO, "xbd_ref", hz/2);
        }       
        xengnt_revoke_access(sc->sc_ring_gntref);
        uvm_km_free(kernel_map, (vaddr_t)sc->sc_ring.sring,
            PAGE_SIZE, UVM_KMF_WIRED);

Should this routine follow some other protocol in order to close down
and revoke the grant_ref_t?

I don't subscribe to port-xen, please copy me on replies.

Dave

-- 
David Young             OJC Technologies
dyoung%ojctech.com@localhost      Urbana, IL * (217) 278-3933