[linux-2.6-block.git] / drivers / base / module.c

// SPDX-License-Identifier: GPL-2.0
/*
 * module.c - module sysfs fun for drivers
 */
#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 = kasprintf(GFP_KERNEL, "%s:%s", drv->bus->name, drv->name);
	if (!driver_name)
		return NULL;

	return driver_name;
}

static void module_create_drivers_dir(struct module_kobject *mk)
{
	static DEFINE_MUTEX(drivers_dir_mutex);

	mutex_lock(&drivers_dir_mutex);
	if (mk && !mk->drivers_dir)
		mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj);
	mutex_unlock(&drivers_dir_mutex);
}

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);
		}
	}
}
Commit	Line	Data
989d42e8	1	// SPDX-License-Identifier: GPL-2.0
c63469a3 GKH	2	/*
c63469a3 GKH	3	* module.c - module sysfs fun for drivers
c63469a3 GKH	4	*/
	5	#include <linux/device.h>
	6	#include <linux/module.h>
	7	#include <linux/errno.h>
5a0e3ad6	8	#include <linux/slab.h>
c63469a3 GKH	9	#include <linux/string.h>
	10	#include "base.h"
	11
	12	static char make_driver_name(struct device_driver drv)
	13	{
	14	char *driver_name;
	15
1653268b	16	driver_name = kasprintf(GFP_KERNEL, "%s:%s", drv->bus->name, drv->name);
c63469a3 GKH	17	if (!driver_name)
	18	return NULL;
	19
c63469a3 GKH	20	return driver_name;
	21	}
	22
	23	static void module_create_drivers_dir(struct module_kobject *mk)
	24	{
7e1b1fc4	25	static DEFINE_MUTEX(drivers_dir_mutex);
c63469a3	26
7e1b1fc4 JS	27	mutex_lock(&drivers_dir_mutex);
	28	if (mk && !mk->drivers_dir)
	29	mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj);
	30	mutex_unlock(&drivers_dir_mutex);
c63469a3 GKH	31	}
	32
	33	void module_add_driver(struct module mod, struct device_driver drv)
	34	{
	35	char *driver_name;
	36	int no_warn;
	37	struct module_kobject *mk = NULL;
	38
	39	if (!drv)
	40	return;
	41
	42	if (mod)
	43	mk = &mod->mkobj;
	44	else if (drv->mod_name) {
	45	struct kobject *mkobj;
	46
	47	/* Lookup built-in module entry in /sys/modules */
	48	mkobj = kset_find_obj(module_kset, drv->mod_name);
	49	if (mkobj) {
	50	mk = container_of(mkobj, struct module_kobject, kobj);
	51	/* remember our module structure */
e5dd1278	52	drv->p->mkobj = mk;
c63469a3 GKH	53	/* kset_find_obj took a reference */
	54	kobject_put(mkobj);
	55	}
	56	}
	57
	58	if (!mk)
	59	return;
	60
	61	/* Don't check return codes; these calls are idempotent */
e5dd1278	62	no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module");
c63469a3 GKH	63	driver_name = make_driver_name(drv);
	64	if (driver_name) {
	65	module_create_drivers_dir(mk);
e5dd1278	66	no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj,
c63469a3 GKH	67	driver_name);
	68	kfree(driver_name);
	69	}
	70	}
	71
	72	void module_remove_driver(struct device_driver *drv)
	73	{
	74	struct module_kobject *mk = NULL;
	75	char *driver_name;
	76
	77	if (!drv)
	78	return;
	79
e5dd1278	80	sysfs_remove_link(&drv->p->kobj, "module");
c63469a3 GKH	81
	82	if (drv->owner)
	83	mk = &drv->owner->mkobj;
e5dd1278 GKH	84	else if (drv->p->mkobj)
e5dd1278 GKH	85	mk = drv->p->mkobj;
c63469a3 GKH	86	if (mk && mk->drivers_dir) {
	87	driver_name = make_driver_name(drv);
	88	if (driver_name) {
	89	sysfs_remove_link(mk->drivers_dir, driver_name);
	90	kfree(driver_name);
	91	}
	92	}
	93	}