Man page 9 : driver_for_each_device

driver_for_each_device - Iterator for devices bound to a driver.

int driver_for_each_device(struct device_driver *  drv , struct device *  start , void *  data , int (* fn ) (struct device *, void *));

drv
    Driver weAqre iterating.

start
    Device to begin with

data
    Data to pass to the callback.

fn
    Function to call for each device.

Iterate over the drvAqs list of devices calling fn for each one.