[PATCH] Add driver_for_each_device().

[PATCH] Add driver_for_each_device().

Now there's an iterator for accessing each device bound to a driver.

Signed-off-by: Patrick Mochel <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Index: linux-2.6.12-rc2/drivers/base/driver.c
===================================================================

---
commit fae3cd00255e3e51ffd59fedb1bdb91ec96be395
tree 59e56a65f4b01f496436bd9b0720737ce1937db4
parent 07e4a3e27fe414980ddc85a358e5a56abc48b363
author [email protected] <[email protected]> Mon, 21 Mar 2005 10:59:56 -0800
committer Greg Kroah-Hartman <[email protected]> Mon, 20 Jun 2005 15:15:13 -0700

 drivers/base/driver.c  |   35 +++++++++++++++++++++++++++++++++++
 include/linux/device.h |    3 +++
 2 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
--- 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
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -136,6 +136,9 @@ struct driver_attribute driver_attr_##_n
 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

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---

• Follow-Ups:
  • [PATCH] Add a klist to struct bus_type for its drivers.
    • From: Greg KH <[email protected]>

• References:
  • [PATCH] Use driver_for_each_device() in drivers/pnp/driver.c instead of manually walking list.
    • From: Greg KH <[email protected]>

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