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[PATCH] Add driver_for_each_device().

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

Signed-off-by: Patrick Mochel <mochel@digitalimplant.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Index: linux-2.6.12-rc2/drivers/base/driver.c
===================================================================
This commit is contained in:
mochel@digitalimplant.org 2005-03-21 10:59:56 -08:00 committed by Greg Kroah-Hartman
parent 07e4a3e27f
commit fae3cd0025
2 changed files with 38 additions and 0 deletions
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35
drivers/base/driver.c
View File

@ -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.

3
include/linux/device.h
View File

@ -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