[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
===================================================================

2 files changed, 38 insertions, 0 deletions

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index 3b269f7e5213..484fed1985aa 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 195b327f3e19..10f5aa20e041 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