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path: root/drivers/base/driver.c
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Diffstat (limited to 'drivers/base/driver.c')
-rw-r--r--drivers/base/driver.c39
1 files changed, 38 insertions, 1 deletions
diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index 3b269f7e5213..1b645886e9eb 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -18,6 +18,43 @@
#define to_dev(node) container_of(node, struct device, driver_list)
#define to_drv(obj) container_of(obj, struct device_driver, kobj)
+
+static struct device * next_device(struct klist_iter * i)
+{
+ struct klist_node * n = klist_next(i);
+ return n ? container_of(n, struct device, knode_driver) : NULL;
+}
+
+/**
+ * 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.
+ *
+ * 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 klist_iter i;
+ struct device * dev;
+ int error = 0;
+
+ if (!drv)
+ return -EINVAL;
+
+ klist_iter_init_node(&drv->klist_devices, &i,
+ start ? &start->knode_driver : NULL);
+ while ((dev = next_device(&i)) && !error)
+ error = fn(dev, data);
+ klist_iter_exit(&i);
+ return error;
+}
+
+EXPORT_SYMBOL_GPL(driver_for_each_device);
+
+
/**
* driver_create_file - create sysfs file for driver.
* @drv: driver.
@@ -85,7 +122,7 @@ void put_driver(struct device_driver * drv)
*/
int driver_register(struct device_driver * drv)
{
- INIT_LIST_HEAD(&drv->devices);
+ klist_init(&drv->klist_devices);
init_completion(&drv->unloaded);
return bus_add_driver(drv);
}