BUS_FOR_EACH_DEV(9)               Device drivers infrastructure               BUS_FOR_EACH_DEV(9)



NAME
       bus_for_each_dev - device iterator.

SYNOPSIS
       int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
                            int (*fn) (struct device *, void *));

ARGUMENTS
       bus
           bus type.

       start
           device to start iterating from.

       data
           data for the callback.

       fn
           function to be called for each device.

DESCRIPTION
       Iterate over bus's list of devices, and call fn for each, passing it data. If start is not
       NULL, we use that device to begin iterating from.

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

NOTE
       The device that returns a non-zero value is not retained in any way, nor is its refcount
       incremented. If the caller needs to retain this data, it should do so, and increment the
       reference count in the supplied callback.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                       BUS_FOR_EACH_DEV(9)