driver core: bus: clean up driver_find()

Convert the driver_find() function to use bus_to_subsys() and not use
the back-pointer to the private structure.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Link: https://lore.kernel.org/r/20230208111330.439504-16-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 1040c72..98edc7a 100644 (file)
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -1302,16 +1302,23 @@ EXPORT_SYMBOL_GPL(subsys_virtual_register);
  */
 struct device_driver *driver_find(const char *name, struct bus_type *bus)
 {
-       struct kobject *k = kset_find_obj(bus->p->drivers_kset, name);
+       struct subsys_private *sp = bus_to_subsys(bus);
+       struct kobject *k;
        struct driver_private *priv;
 
-       if (k) {
-               /* Drop reference added by kset_find_obj() */
-               kobject_put(k);
-               priv = to_driver(k);
-               return priv->driver;
-       }
-       return NULL;
+       if (!sp)
+               return NULL;
+
+       k = kset_find_obj(sp->drivers_kset, name);
+       subsys_put(sp);
+       if (!k)
+               return NULL;
+
+       priv = to_driver(k);
+
+       /* Drop reference added by kset_find_obj() */
+       kobject_put(k);
+       return priv->driver;
 }
 EXPORT_SYMBOL_GPL(driver_find);