1 // SPDX-License-Identifier: GPL-2.0
3 * module.c - module sysfs fun for drivers
5 #include <linux/device.h>
6 #include <linux/module.h>
7 #include <linux/errno.h>
8 #include <linux/slab.h>
9 #include <linux/string.h>
10 #include <linux/rcupdate.h>
13 static char *make_driver_name(const struct device_driver *drv)
17 driver_name = kasprintf(GFP_KERNEL, "%s:%s", drv->bus->name, drv->name);
24 static void module_create_drivers_dir(struct module_kobject *mk)
26 static DEFINE_MUTEX(drivers_dir_mutex);
28 mutex_lock(&drivers_dir_mutex);
29 if (mk && !mk->drivers_dir)
30 mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj);
31 mutex_unlock(&drivers_dir_mutex);
34 int module_add_driver(struct module *mod, const struct device_driver *drv)
37 struct module_kobject *mk = NULL;
45 else if (drv->mod_name) {
46 struct kobject *mkobj;
48 /* Lookup built-in module entry in /sys/modules */
49 mkobj = kset_find_obj(module_kset, drv->mod_name);
51 mk = container_of(mkobj, struct module_kobject, kobj);
52 /* remember our module structure */
54 /* kset_find_obj took a reference */
62 ret = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module");
66 driver_name = make_driver_name(drv);
72 module_create_drivers_dir(mk);
73 if (!mk->drivers_dir) {
75 goto out_free_driver_name;
78 ret = sysfs_create_link(mk->drivers_dir, &drv->p->kobj, driver_name);
80 goto out_remove_drivers_dir;
86 out_remove_drivers_dir:
87 sysfs_remove_link(mk->drivers_dir, driver_name);
93 sysfs_remove_link(&drv->p->kobj, "module");
97 void module_remove_driver(const struct device_driver *drv)
99 struct module_kobject *mk = NULL;
105 /* Synchronize with dev_uevent() */
108 sysfs_remove_link(&drv->p->kobj, "module");
111 mk = &drv->owner->mkobj;
112 else if (drv->p->mkobj)
114 if (mk && mk->drivers_dir) {
115 driver_name = make_driver_name(drv);
117 sysfs_remove_link(mk->drivers_dir, driver_name);