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author | mochel@digitalimplant.org <mochel@digitalimplant.org> | 2005-03-21 10:59:56 -0800 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2005-06-20 15:15:13 -0700 |
commit | fae3cd00255e3e51ffd59fedb1bdb91ec96be395 (patch) | |
tree | 59e56a65f4b01f496436bd9b0720737ce1937db4 /drivers | |
parent | 07e4a3e27fe414980ddc85a358e5a56abc48b363 (diff) | |
download | op-kernel-dev-fae3cd00255e3e51ffd59fedb1bdb91ec96be395.zip op-kernel-dev-fae3cd00255e3e51ffd59fedb1bdb91ec96be395.tar.gz |
[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
===================================================================
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/base/driver.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/base/driver.c b/drivers/base/driver.c index 3b269f7..484fed1 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. |