/* * module.c - module sysfs fun for drivers * * This file is released under the GPLv2 * */#include <linux/device.h>#include <linux/module.h>#include <linux/errno.h>#include <linux/slab.h>#include <linux/string.h>#include "base.h" static char *make_driver_name(struct device_driver *drv){	char *driver_name; 	driver_name = kmalloc(strlen(drv->name) + strlen(drv->bus->name) + 2,			      GFP_KERNEL);	if (!driver_name)		return NULL; 	sprintf(driver_name, "%s:%s", drv->bus->name, drv->name);	return driver_name;} static void module_create_drivers_dir(struct module_kobject *mk){	if (!mk || mk->drivers_dir)		return; 	mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj);} void module_add_driver(struct module *mod, struct device_driver *drv){	char *driver_name;	int no_warn;	struct module_kobject *mk = NULL; 	if (!drv)		return; 	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);			/* remember our module structure */			drv->p->mkobj = mk;			/* kset_find_obj took a reference */			kobject_put(mkobj);		}	} 	if (!mk)		return; 	/* Don't check return codes; these calls are idempotent */	no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module");	driver_name = make_driver_name(drv);	if (driver_name) {		module_create_drivers_dir(mk);		no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj,					    driver_name);		kfree(driver_name);	}} void module_remove_driver(struct device_driver *drv){	struct module_kobject *mk = NULL;	char *driver_name; 	if (!drv)		return; 	sysfs_remove_link(&drv->p->kobj, "module"); 	if (drv->owner)		mk = &drv->owner->mkobj;	else if (drv->p->mkobj)		mk = drv->p->mkobj;	if (mk && mk->drivers_dir) {		driver_name = make_driver_name(drv);		if (driver_name) {			sysfs_remove_link(mk->drivers_dir, driver_name);			kfree(driver_name);		}	}}