suse man page for bus_for_each_drv

BUS_FOR_EACH_DRV(9)					   Device drivers infrastructure				       BUS_FOR_EACH_DRV(9)

NAME
       bus_for_each_drv - driver iterator

SYNOPSIS
       int bus_for_each_drv(struct bus_type * bus, struct device_driver * start, void * data, int (*fn) (struct device_driver *, void *));

ARGUMENTS
       bus
	   bus we're dealing with.

       start
	   driver to start iterating on.

       data
	   data to pass to the callback.

       fn
	   function to call for each driver.

DESCRIPTION
       This is nearly identical to the device iterator above. We iterate over each driver that belongs to bus, and call fn for each. If fn returns
       anything but 0, we break out and return it. If start is not NULL, we use it as the head of the list.

NOTE
       we don't return the driver that returns a non-zero value, nor do we leave the reference count incremented for that driver. If the caller
       needs to know that info, it must set it in the callback. It must also be sure to increment the refcount so it doesn't disappear before
       returning to the caller.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010						       BUS_FOR_EACH_DRV(9)