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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> |
10 | #include <linux/slab.h> |
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 */ |
54 | drv->p->mkobj = mk; |
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 */ |
64 | no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module"); |
65 | driver_name = make_driver_name(drv); |
66 | if (driver_name) { |
67 | module_create_drivers_dir(mk); |
68 | no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj, |
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 | |
82 | sysfs_remove_link(&drv->p->kobj, "module"); |
83 | |
84 | if (drv->owner) |
85 | mk = &drv->owner->mkobj; |
86 | else if (drv->p->mkobj) |
87 | mk = drv->p->mkobj; |
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 | } |
96 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9