[PATCH v4 2/3] driver core: make software nodes available earlier

Bartosz Golaszewski
2026-03-30T12:41:06Z

Software nodes are currently initialized in a function registered as
a postcore_initcall(). However, some devices may want to register
software nodes earlier than that (or also in a postcore_initcall() where
they're at the merci of the link order). Move the initialization to
driver_init() making swnode available much earlier as well as making
their initialization time deterministic.

Suggested-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
---
drivers/base/base.h | 1 +
drivers/base/init.c | 1 +
drivers/base/swnode.c | 13 ++-----------
3 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/base/base.h b/drivers/base/base.h
index afeda89fd4710c4c5492b5f19134e2aa8e1e581e..30b416588617bbc3fb433654c999c9b533d73752 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -312,6 +312,7 @@ static inline int devtmpfs_create_node(struct device *dev) { return 0; }
static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
#endif

+void software_node_init(void);
void software_node_notify(struct device *dev);
void software_node_notify_remove(struct device *dev);

diff --git a/drivers/base/init.c b/drivers/base/init.c
index 9d2b06d65dfc6bf8759f6c232e2d3f753da139ac..af8014416c2460fac91b08ce919c082bf961fcce 100644
--- a/drivers/base/init.c
+++ b/drivers/base/init.c
@@ -34,6 +34,7 @@ void __init driver_init(void)
*/
faux_bus_init();
of_core_init();
+ software_node_init();
platform_bus_init();
auxiliary_bus_init();
memory_dev_init();
diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index 51320837f3a9f1bf4f65aa161d9b941affc74936..a80575bf598b509eb1469cae8a09c601726ce0c8 100644
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -1127,18 +1127,9 @@ void software_node_notify_remove(struct device *dev)
}
}

-static int __init software_node_init(void)
+void __init software_node_init(void)
{
swnode_kset = kset_create_and_add("software_nodes", NULL, kernel_kobj);
if (!swnode_kset)
- return -ENOMEM;
- return 0;
-}
-postcore_initcall(software_node_init);
-
-static void __exit software_node_exit(void)
-{
- ida_destroy(&swnode_root_ids);
- kset_unregister(swnode_kset);
+ pr_err("failed to register software nodes\n");
}
-__exitcall(software_node_exit);

--
2.47.3