diff options
| author | mochel@digitalimplant.org <mochel@digitalimplant.org> | 2005-03-21 10:59:56 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2005-06-20 15:15:13 -0700 |
| commit | fae3cd00255e3e51ffd59fedb1bdb91ec96be395 (patch) | |
| tree | 59e56a65f4b01f496436bd9b0720737ce1937db4 | |
| parent | 07e4a3e27fe414980ddc85a358e5a56abc48b363 (diff) | |
[PATCH] Add driver_for_each_device().
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
===================================================================
| -rw-r--r-- | drivers/base/driver.c | 35 | ||||
| -rw-r--r-- | include/linux/device.h | 3 |
2 files changed, 38 insertions, 0 deletions
diff --git a/drivers/base/driver.c b/drivers/base/driver.c index 3b269f7e521..484fed1985a 100644 --- a/drivers/base/driver.c +++ b/drivers/base/driver.c @@ -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. diff --git a/include/linux/device.h b/include/linux/device.h index 195b327f3e1..10f5aa20e04 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -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 |