AHCI_QUIESCE
ahci_ctlp->ahcictl_flags |= AHCI_QUIESCE;
ahci_ctlp->ahcictl_flags &= ~AHCI_QUIESCE;
ASSERT(ahci_ctlp->ahcictl_flags & AHCI_QUIESCE ||
ASSERT(ahci_ctlp->ahcictl_flags & (AHCI_ATTACH | AHCI_QUIESCE) ||
ASSERT(ahci_ctlp->ahcictl_flags & AHCI_QUIESCE ||