// SPDX-License-Identifier: GPL-2.0
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/*
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* module.c - module sysfs fun for drivers
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include "base.h"
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static char *make_driver_name(struct device_driver *drv)
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{
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char *driver_name;
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driver_name = kasprintf(GFP_KERNEL, "%s:%s", drv->bus->name, drv->name);
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if (!driver_name)
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return NULL;
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return driver_name;
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}
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static void module_create_drivers_dir(struct module_kobject *mk)
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{
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static DEFINE_MUTEX(drivers_dir_mutex);
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mutex_lock(&drivers_dir_mutex);
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if (mk && !mk->drivers_dir)
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mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj);
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mutex_unlock(&drivers_dir_mutex);
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}
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void module_add_driver(struct module *mod, struct device_driver *drv)
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{
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char *driver_name;
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int no_warn;
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struct module_kobject *mk = NULL;
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if (!drv)
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return;
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if (mod)
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mk = &mod->mkobj;
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else if (drv->mod_name) {
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struct kobject *mkobj;
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/* Lookup built-in module entry in /sys/modules */
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mkobj = kset_find_obj(module_kset, drv->mod_name);
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if (mkobj) {
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mk = container_of(mkobj, struct module_kobject, kobj);
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/* remember our module structure */
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drv->p->mkobj = mk;
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/* kset_find_obj took a reference */
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kobject_put(mkobj);
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}
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}
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if (!mk)
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return;
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/* Don't check return codes; these calls are idempotent */
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no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module");
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driver_name = make_driver_name(drv);
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if (driver_name) {
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module_create_drivers_dir(mk);
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no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj,
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driver_name);
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kfree(driver_name);
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}
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}
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void module_remove_driver(struct device_driver *drv)
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{
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struct module_kobject *mk = NULL;
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char *driver_name;
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if (!drv)
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return;
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sysfs_remove_link(&drv->p->kobj, "module");
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if (drv->owner)
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mk = &drv->owner->mkobj;
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else if (drv->p->mkobj)
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mk = drv->p->mkobj;
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if (mk && mk->drivers_dir) {
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driver_name = make_driver_name(drv);
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if (driver_name) {
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sysfs_remove_link(mk->drivers_dir, driver_name);
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kfree(driver_name);
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}
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}
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}
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