/*
* It might happen that the administrator used ifconfig to externally destroy
* the interface. In that case, tap_fops_close will be called while
* tap_detach is already happening. If we called it again from here, we
* would dead lock. TAP_GOING ensures that this situation doesn't happen.
*/
static int
tap_fops_close(file_t *fp)
{
int unit = fp->f_devunit;
struct tap_softc *sc;
int error;
sc = device_lookup_private(&tap_cd, unit);
if (sc == NULL)
return (ENXIO);
/* tap_dev_close currently always succeeds, but it might not
* always be the case. */
KERNEL_LOCK(1, NULL);
if ((error = tap_dev_close(sc)) != 0) {
KERNEL_UNLOCK_ONE(NULL);
return (error);
}
/* Destroy the device now that it is no longer useful,
* unless it's already being destroyed. */
if ((sc->sc_flags & TAP_GOING) != 0) {
KERNEL_UNLOCK_ONE(NULL);
return (0);
}
error = tap_clone_destroyer(sc->sc_dev);
KERNEL_UNLOCK_ONE(NULL);
return error;
}
/*
* The clean design of if_clone and autoconf(9) makes that part
* really straightforward. The second argument of config_detach
* means neither QUIET nor FORCED.
*/
static int
tap_clone_destroy(struct ifnet *ifp)
{
struct tap_softc *sc = ifp->if_softc;
return tap_clone_destroyer(sc->sc_dev);
}
/*
* The clean design of if_clone and autoconf(9) makes that part
* really straightforward. The second argument of config_detach
* means neither QUIET nor FORCED.
*/
static int
tap_clone_destroy(struct ifnet *ifp)
{
struct tap_softc *sc = ifp->if_softc;
int error = tap_clone_destroyer(sc->sc_dev);
if (error == 0)
atomic_dec_uint(&tap_count);
return error;
}