[RESEND][PATCH 4/4] Driver core updates (needed for serio)

[Dmitry Torokhov <dtor_core@ameritech.net>]

===================================================================


ChangeSet@1.1822, 2004-07-07 18:18:04-05:00, dtor_core@ameritech.net
  Driver core: add driver_find helper to find a driver by its name
  
  Signed-off-by: Dmitry Torokhov <dtor@mail.ru>


 drivers/base/driver.c  |   19 +++++++++++++++++++
 include/linux/device.h |    1 +
 2 files changed, 20 insertions(+)


===================================================================



diff -Nru a/drivers/base/driver.c b/drivers/base/driver.c
--- a/drivers/base/driver.c	2004-07-07 19:56:21 -05:00
+++ b/drivers/base/driver.c	2004-07-07 19:56:21 -05:00
@@ -111,10 +111,29 @@
 	up(&drv->unload_sem);
 }
 
+/**
+ *	driver_find - locate driver on a bus by its name.
+ *	@name:	name of the driver.
+ *	@bus:	bus to scan for the driver.
+ *
+ *	Call kset_find_obj() to iterate over list of drivers on
+ *	a bus to find driver by name. Return driver if found.
+ *
+ *	Note that kset_find_obj increments driver's reference count.
+ */
+struct device_driver *driver_find(const char *name, struct bus_type *bus)
+{
+	struct kobject *k = kset_find_obj(&bus->drivers, name);
+	if (k)
+		return to_drv(k);
+	return NULL;
+}
+
 EXPORT_SYMBOL(driver_register);
 EXPORT_SYMBOL(driver_unregister);
 EXPORT_SYMBOL(get_driver);
 EXPORT_SYMBOL(put_driver);
+EXPORT_SYMBOL(driver_find);
 
 EXPORT_SYMBOL(driver_create_file);
 EXPORT_SYMBOL(driver_remove_file);
diff -Nru a/include/linux/device.h b/include/linux/device.h
--- a/include/linux/device.h	2004-07-07 19:56:21 -05:00
+++ b/include/linux/device.h	2004-07-07 19:56:21 -05:00
@@ -120,6 +120,7 @@
 
 extern struct device_driver * get_driver(struct device_driver * drv);
 extern void put_driver(struct device_driver * drv);
+extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
 
 
 /* driverfs interface for exporting driver attributes */