projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| c63469a3 GKH |
1 | /* |
| 2 | * module.c - module sysfs fun for drivers | |
| 3 | * | |
| 4 | * This file is released under the GPLv2 | |
| 5 | * | |
| 6 | */ | |
| 7 | #include <linux/device.h> | |
| 8 | #include <linux/module.h> | |
| 9 | #include <linux/errno.h> | |
| 5a0e3ad6 | 10 | #include <linux/slab.h> |
| c63469a3 GKH |
11 | #include <linux/string.h> |
| 12 | #include "base.h" | |
| 13 | ||
| 14 | static char *make_driver_name(struct device_driver *drv) | |
| 15 | { | |
| 16 | char *driver_name; | |
| 17 | ||
| 18 | driver_name = kmalloc(strlen(drv->name) + strlen(drv->bus->name) + 2, | |
| 19 | GFP_KERNEL); | |
| 20 | if (!driver_name) | |
| 21 | return NULL; | |
| 22 | ||
| 23 | sprintf(driver_name, "%s:%s", drv->bus->name, drv->name); | |
| 24 | return driver_name; | |
| 25 | } | |
| 26 | ||
| 27 | static void module_create_drivers_dir(struct module_kobject *mk) | |
| 28 | { | |
| 29 | if (!mk || mk->drivers_dir) | |
| 30 | return; | |
| 31 | ||
| 32 | mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj); | |
| 33 | } | |
| 34 | ||
| 35 | void module_add_driver(struct module *mod, struct device_driver *drv) | |
| 36 | { | |
| 37 | char *driver_name; | |
| 38 | int no_warn; | |
| 39 | struct module_kobject *mk = NULL; | |
| 40 | ||
| 41 | if (!drv) | |
| 42 | return; | |
| 43 | ||
| 44 | if (mod) | |
| 45 | mk = &mod->mkobj; | |
| 46 | else if (drv->mod_name) { | |
| 47 | struct kobject *mkobj; | |
| 48 | ||
| 49 | /* Lookup built-in module entry in /sys/modules */ | |
| 50 | mkobj = kset_find_obj(module_kset, drv->mod_name); | |
| 51 | if (mkobj) { | |
| 52 | mk = container_of(mkobj, struct module_kobject, kobj); | |
| 53 | /* remember our module structure */ | |
| e5dd1278 | 54 | drv->p->mkobj = mk; |
| c63469a3 GKH |
55 | /* kset_find_obj took a reference */ |
| 56 | kobject_put(mkobj); | |
| 57 | } | |
| 58 | } | |
| 59 | ||
| 60 | if (!mk) | |
| 61 | return; | |
| 62 | ||
| 63 | /* Don't check return codes; these calls are idempotent */ | |
| e5dd1278 | 64 | no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module"); |
| c63469a3 GKH |
65 | driver_name = make_driver_name(drv); |
| 66 | if (driver_name) { | |
| 67 | module_create_drivers_dir(mk); | |
| e5dd1278 | 68 | no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj, |
| c63469a3 GKH |
69 | driver_name); |
| 70 | kfree(driver_name); | |
| 71 | } | |
| 72 | } | |
| 73 | ||
| 74 | void module_remove_driver(struct device_driver *drv) | |
| 75 | { | |
| 76 | struct module_kobject *mk = NULL; | |
| 77 | char *driver_name; | |
| 78 | ||
| 79 | if (!drv) | |
| 80 | return; | |
| 81 | ||
| e5dd1278 | 82 | sysfs_remove_link(&drv->p->kobj, "module"); |
| c63469a3 GKH |
83 | |
| 84 | if (drv->owner) | |
| 85 | mk = &drv->owner->mkobj; | |
| e5dd1278 GKH |
86 | else if (drv->p->mkobj) |
| 87 | mk = drv->p->mkobj; | |
| c63469a3 GKH |
88 | if (mk && mk->drivers_dir) { |
| 89 | driver_name = make_driver_name(drv); | |
| 90 | if (driver_name) { | |
| 91 | sysfs_remove_link(mk->drivers_dir, driver_name); | |
| 92 | kfree(driver_name); | |
| 93 | } | |
| 94 | } | |
| 95 | } |