DEV_FLAGS_INUSE
if (!(stp->dev_flags & DEV_FLAGS_INUSE) ||
stp->dev_flags |= DEV_FLAGS_INUSE;
if (!(dtp->dev_flags & DEV_FLAGS_INUSE) ||
dtp->dev_flags |= DEV_FLAGS_INUSE;
stp->dev_flags &= ~DEV_FLAGS_INUSE;
stp->dev_flags &= ~DEV_FLAGS_INUSE;
dtp->dev_flags &= ~DEV_FLAGS_INUSE;
stp->dev_flags &= ~DEV_FLAGS_INUSE;
dtp->dev_flags &= ~DEV_FLAGS_INUSE;