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.
 */ 

static int
e1000g_quiesce(dev_info_t *devinfo)
{
        struct e1000g *Adapter;

        Adapter = (struct e1000g *)ddi_get_driver_private(devinfo);

        if (Adapter == NULL)
                return (DDI_SUCCESS);

        e1000g_clear_all_interrupts(Adapter);

        if (e1000_reset_hw(&Adapter->shared) != 0)
                return (DDI_FAILURE);

        return (DDI_SUCCESS);
}