Sample list of drivers that require quiesce():

    Network drivers:
	e1000g
	bge
	nge

    USB drivers:
	ohci
	ehci
	uhci

    HBA drivers:
	marvell88sx
	mpt
	adpu320

    Disk drivers:
	ata
	cmdk

    Graphics/display drivers:

	vgatext
	nvidia
	amd64_gart


Sample list of drivers that don't require quiesce():

    Most pseudo drivers

    i8042
    kb8042
    mouse8042
    xsvc
    iscsi
    mc-amd


Sample quiesce() implementation:

/*
 * Disclaimer: These are implementations that are working on the set of
 * test machines we are using.  Driver owners should review each quiesce
 * implementation to make sure that they are correct.
 */ 


/* ARGSUSED */
int
ata_quiesce(dev_info_t *dip, ddi_quiesce_cmd_t cmd, void *arg)
{
        if (cmd != DDI_QUIESCE)
                return (DDI_FAILURE);

        return (ata_devo_reset(dip, DDI_RESET_FORCE));
}



/*ARGSUSED*/
int
ohci_quiesce(dev_info_t *dip, ddi_quiesce_cmd_t cmd, void *arg)
{

#if defined(__sparc)
        return (DDI_SUCCESS);
#else
        ohci_state_t    *ohcip = ohci_obtain_state(dip);

        if (cmd != DDI_QUIESCE)
                return (DDI_FAILURE);

        mutex_enter(&ohcip->ohci_int_mutex);
        (void) ohci_stop_root_hub_timer(ohcip);
        (void) ohci_hw_teardown(ohcip, 1);
        mutex_exit(&ohcip->ohci_int_mutex);

        return (DDI_SUCCESS);
#endif
}


/* ARGSUSED */
static int
e1000g_quiesce(dev_info_t *devinfo, ddi_quiesce_cmd_t cmd, void *arg)
{
        return (e1000g_suspend(devinfo));
}