From: mochel@digitalimplant.org <mochel@digitalimplant.org>
Date: Mon, 21 Mar 2005 18:59:56 +0000 (-0800)
Subject: [PATCH] Add driver_for_each_device().
X-Git-Url: http://git.efficios.com/?a=commitdiff_plain;h=fae3cd00255e3e51ffd59fedb1bdb91ec96be395;p=deliverable%2Flinux.git

[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
===================================================================
---

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