isp_lock
mtx_sleep(isp, &isp->isp_lock, 0, "want_isp_enable_lun", 0);
mtx_sleep(&status, &isp->isp_lock, PRIBIO, "isp_enable_deferred", 0);
mtx_sleep(isp, &isp->isp_lock, PRIBIO, "want_isp_disable_lun", 0);
mtx_sleep(ccb, &isp->isp_lock, PRIBIO, "isp_disable_lun", 0);
lksleep(wchan, &isp->isp_lock, PUSER, "tsnooze", 0);
KKASSERT(lockowned(&isp->isp_lock));