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Commit fae3cd00 authored by Patrick Mochel's avatar Patrick Mochel Committed by Greg Kroah-Hartman
Browse files

[PATCH] Add driver_for_each_device(). 



Now there's an iterator for accessing each device bound to a driver.

Signed-off-by: default avatarPatrick Mochel <mochel@digitalimplant.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>

Index: linux-2.6.12-rc2/drivers/base/driver.c
===================================================================
parent 07e4a3e2

drivers/base/driver.c

+35 −0
Original line number Diff line number Diff line
@@ -18,6 +18,41 @@ 
#define to_dev(node) container_of(node, struct device, driver_list)

#define to_drv(obj) container_of(obj, struct device_driver, kobj)





/**

 *	driver_for_each_device - Iterator for devices bound to a driver.

 *	@drv:	Driver we're iterating.

 *	@data:	Data to pass to the callback.

 *	@fn:	Function to call for each device.

 *

 *	Take the bus's rwsem and iterate over the @drv's list of devices,

 *	calling @fn for each one.

 */



int driver_for_each_device(struct device_driver * drv, struct device * start, 

			   void * data, int (*fn)(struct device *, void *))

{

	struct list_head * head;

	struct device * dev;

	int error = 0;



	down_read(&drv->bus->subsys.rwsem);

	head = &drv->devices;

	dev = list_prepare_entry(start, head, driver_list);

	list_for_each_entry_continue(dev, head, driver_list) {

		get_device(dev);

		error = fn(dev, data);

		put_device(dev);

		if (error)

			break;

	}

	up_read(&drv->bus->subsys.rwsem);

	return error;

}



EXPORT_SYMBOL(driver_for_each_device);





/**

 *	driver_create_file - create sysfs file for driver.

 *	@drv:	driver.

include/linux/device.h

+3 −0
Original line number Diff line number Diff line
@@ -136,6 +136,9 @@ struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store) 
extern int driver_create_file(struct device_driver *, struct driver_attribute *);

extern void driver_remove_file(struct device_driver *, struct driver_attribute *);



extern int driver_for_each_device(struct device_driver * drv, struct device * start,

				  void * data, int (*fn)(struct device *, void *));





/*

 * device classes