6.6-stable review patch. If anyone has any objections, please let me know.
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From: Shyam Saini shyamsaini@linux.microsoft.com
[ Upstream commit f95bbfe18512c5c018720468959edac056a17196 ]
module_add_driver() relies on module_kset list for /sys/module/<built-in-module>/drivers directory creation.
Since, commit 96a1a2412acba ("kernel/params.c: defer most of param_sysfs_init() to late_initcall time") drivers which are initialized from subsys_initcall() or any other higher precedence initcall couldn't find the related kobject entry in the module_kset list because module_kset is not fully populated by the time module_add_driver() refers it. As a consequence, module_add_driver() returns early without calling make_driver_name(). Therefore, /sys/module/<built-in-module>/drivers is never created.
Fix this issue by letting module_add_driver() handle module_kobject creation itself.
Fixes: 96a1a2412acb ("kernel/params.c: defer most of param_sysfs_init() to late_initcall time") Cc: stable@vger.kernel.org # requires all other patches from the series Suggested-by: Rasmus Villemoes linux@rasmusvillemoes.dk Signed-off-by: Shyam Saini shyamsaini@linux.microsoft.com Acked-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Link: https://lore.kernel.org/r/20250227184930.34163-5-shyamsaini@linux.microsoft.... Signed-off-by: Petr Pavlu petr.pavlu@suse.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/base/module.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-)
diff --git a/drivers/base/module.c b/drivers/base/module.c index a33663d92256d..955582b34e54a 100644 --- a/drivers/base/module.c +++ b/drivers/base/module.c @@ -42,16 +42,13 @@ int module_add_driver(struct module *mod, struct device_driver *drv) if (mod) mk = &mod->mkobj; else if (drv->mod_name) { - struct kobject *mkobj; - - /* Lookup built-in module entry in /sys/modules */ - mkobj = kset_find_obj(module_kset, drv->mod_name); - if (mkobj) { - mk = container_of(mkobj, struct module_kobject, kobj); + /* Lookup or create built-in module entry in /sys/modules */ + mk = lookup_or_create_module_kobject(drv->mod_name); + if (mk) { /* remember our module structure */ drv->p->mkobj = mk; - /* kset_find_obj took a reference */ - kobject_put(mkobj); + /* lookup_or_create_module_kobject took a reference */ + kobject_put(&mk->kobj); } }