driver core: attribute_container: change return type to void

attribute_container_register() has always returned 0 since its
introduction in commit 06ff5a987e ("Add attribute container to generic
device model") in the historical Linux tree [1]. Convert the return type
to void and update all callers.

This removes dead code where callers checked for errors that could never
occur.

Link: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git [1]

Signed-off-by: Daniel Gomez <da.gomez@samsung.com>
Link: https://patch.msgid.link/20251220-dev-attribute-container-linux-scsi-v1-1-d58fcd03bf21@samsung.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/attribute_container.c

@@ -69,7 +69,7 @@ static DEFINE_MUTEX(attribute_container_mutex);
  * @cont: The container to register.  This must be allocated by the
  *        callee and should also be zeroed by it.
  */
-int
+void
 attribute_container_register(struct attribute_container *cont)
 {
 	INIT_LIST_HEAD(&cont->node);
@@ -79,8 +79,6 @@ attribute_container_register(struct attribute_container *cont)
 	mutex_lock(&attribute_container_mutex);
 	list_add_tail(&cont->node, &attribute_container_list);
 	mutex_unlock(&attribute_container_mutex);
-
-	return 0;
 }
 EXPORT_SYMBOL_GPL(attribute_container_register);
 

drivers/base/transport_class.c

@@ -88,17 +88,13 @@ static int anon_transport_dummy_function(struct transport_container *tc,
  * events.  Use prezero and then use DECLARE_ANON_TRANSPORT_CLASS() to
  * initialise the anon transport class storage.
  */
-int anon_transport_class_register(struct anon_transport_class *atc)
+void anon_transport_class_register(struct anon_transport_class *atc)
 {
-	int error;
 	atc->container.class = &atc->tclass.class;
 	attribute_container_set_no_classdevs(&atc->container);
-	error = attribute_container_register(&atc->container);
-	if (error)
-		return error;
+	attribute_container_register(&atc->container);
 	atc->tclass.setup = anon_transport_dummy_function;
 	atc->tclass.remove = anon_transport_dummy_function;
-	return 0;
 }
 EXPORT_SYMBOL_GPL(anon_transport_class_register);
 

drivers/scsi/scsi_transport_spi.c

@@ -1622,7 +1622,7 @@ static __init int spi_transport_init(void)
 	error = transport_class_register(&spi_transport_class);
 	if (error)
 		return error;
-	error = anon_transport_class_register(&spi_device_class);
+	anon_transport_class_register(&spi_device_class);
 	return transport_class_register(&spi_host_class);
 }
 

include/linux/attribute_container.h

@@ -36,7 +36,7 @@ attribute_container_set_no_classdevs(struct attribute_container *atc)
 	atc->flags |= ATTRIBUTE_CONTAINER_NO_CLASSDEVS;
 }
 
-int attribute_container_register(struct attribute_container *cont);
+void attribute_container_register(struct attribute_container *cont);
 int __must_check attribute_container_unregister(struct attribute_container *cont);
 void attribute_container_create_device(struct device *dev,
 				       int (*fn)(struct attribute_container *,

include/linux/transport_class.h

@@ -87,9 +87,9 @@ transport_unregister_device(struct device *dev)
 	transport_destroy_device(dev);
 }
 
-static inline int transport_container_register(struct transport_container *tc)
+static inline void transport_container_register(struct transport_container *tc)
 {
-	return attribute_container_register(&tc->ac);
+	attribute_container_register(&tc->ac);
 }
 
 static inline void transport_container_unregister(struct transport_container *tc)
@@ -99,7 +99,7 @@ static inline void transport_container_unregister(struct transport_container *tc
 }
 
 int transport_class_register(struct transport_class *);
-int anon_transport_class_register(struct anon_transport_class *);
+void anon_transport_class_register(struct anon_transport_class *);
 void transport_class_unregister(struct transport_class *);
 void anon_transport_class_unregister(struct anon_transport_class *);