The
device_get_ivars ();
function returns the bus-specific instance variables of a device.
The
device_set_ivars ();
function sets the bus-specific instance variables of a device.
Typically, only bus drivers will use these functions.
The kernel assumes that the bus driver will manage this memory, and no
automatic memory allocation or deallocation happens.
Client drivers should access ivars through the
BUS_READ_IVAR9
interface instead.