class_for_each_device (9)

int class_for_each_device(struct class * class, struct device * start, void * data, int (*fn) (struct device *, void *));

class

the class we're iterating

start

the device to start with in the list, if any.

data

data for the callback

fn

function to be called for each device

Iterate over class's list of devices, and call fn for each, passing it data. If start is set, the list iteration will start there, otherwise if it is NULL, the iteration starts at the beginning of the list.

We check the return of fn each time. If it returns anything other than 0, we break out and return that value.

fn is allowed to do anything including calling back into class code. There's no locking restriction.