{
int cpu;
- INIT_LIST_HEAD(&mod->modules_which_use_me);
+ INIT_LIST_HEAD(&mod->source_list);
+ INIT_LIST_HEAD(&mod->target_list);
for_each_possible_cpu(cpu) {
per_cpu_ptr(mod->refptr, cpu)->incs = 0;
per_cpu_ptr(mod->refptr, cpu)->decs = 0;
mod->waiter = current;
}
-/* modules using other modules */
-struct module_use
-{
- struct list_head list;
- struct module *module_which_uses;
-};
-
/* Does a already use b? */
static int already_uses(struct module *a, struct module *b)
{
struct module_use *use;
- list_for_each_entry(use, &b->modules_which_use_me, list) {
- if (use->module_which_uses == a) {
+ list_for_each_entry(use, &b->source_list, source_list) {
+ if (use->source == a) {
DEBUGP("%s uses %s!\n", a->name, b->name);
return 1;
}
return 0;
}
+/*
+ * Module a uses b
+ * - we add 'a' as a "source", 'b' as a "target" of module use
+ * - the module_use is added to the list of 'b' sources (so
+ * 'b' can walk the list to see who sourced them), and of 'a'
+ * targets (so 'a' can see what modules it targets).
+ */
+static int add_module_usage(struct module *a, struct module *b)
+{
+ struct module_use *use;
+
+ DEBUGP("Allocating new usage for %s.\n", a->name);
+ use = kmalloc(sizeof(*use), GFP_ATOMIC);
+ if (!use) {
+ printk(KERN_WARNING "%s: out of memory loading\n", a->name);
+ return -ENOMEM;
+ }
+
+ use->source = a;
+ use->target = b;
+ list_add(&use->source_list, &b->source_list);
+ list_add(&use->target_list, &a->target_list);
+ return 0;
+}
+
/* Module a uses b */
int use_module(struct module *a, struct module *b)
{
- struct module_use *use;
- int no_warn, err;
+ int err;
if (b == NULL || already_uses(a, b)) return 1;
if (err)
return 0;
- DEBUGP("Allocating new usage for %s.\n", a->name);
- use = kmalloc(sizeof(*use), GFP_ATOMIC);
- if (!use) {
- printk("%s: out of memory loading\n", a->name);
+ err = add_module_usage(a, b);
+ if (err) {
module_put(b);
return 0;
}
-
- use->module_which_uses = a;
- list_add(&use->list, &b->modules_which_use_me);
- no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
return 1;
}
EXPORT_SYMBOL_GPL(use_module);
/* Clear the unload stuff of the module. */
static void module_unload_free(struct module *mod)
{
- struct module *i;
-
- list_for_each_entry(i, &modules, list) {
- struct module_use *use;
+ struct module_use *use, *tmp;
- list_for_each_entry(use, &i->modules_which_use_me, list) {
- if (use->module_which_uses == mod) {
- DEBUGP("%s unusing %s\n", mod->name, i->name);
- module_put(i);
- list_del(&use->list);
- kfree(use);
- sysfs_remove_link(i->holders_dir, mod->name);
- /* There can be at most one match. */
- break;
- }
- }
+ list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
+ struct module *i = use->target;
+ DEBUGP("%s unusing %s\n", mod->name, i->name);
+ module_put(i);
+ list_del(&use->source_list);
+ list_del(&use->target_list);
+ kfree(use);
}
}
goto out;
}
- if (!list_empty(&mod->modules_which_use_me)) {
+ if (!list_empty(&mod->source_list)) {
/* Other modules depend on us: get rid of them first. */
ret = -EWOULDBLOCK;
goto out;
/* Always include a trailing , so userspace can differentiate
between this and the old multi-field proc format. */
- list_for_each_entry(use, &mod->modules_which_use_me, list) {
+ list_for_each_entry(use, &mod->source_list, source_list) {
printed_something = 1;
- seq_printf(m, "%s,", use->module_which_uses->name);
+ seq_printf(m, "%s,", use->source->name);
}
if (mod->init != NULL && mod->exit == NULL) {
#endif
#ifdef CONFIG_SYSFS
-int module_add_modinfo_attrs(struct module *mod)
+static void add_usage_links(struct module *mod)
+{
+#ifdef CONFIG_MODULE_UNLOAD
+ struct module_use *use;
+ int nowarn;
+
+ list_for_each_entry(use, &mod->target_list, target_list) {
+ nowarn = sysfs_create_link(use->target->holders_dir,
+ &mod->mkobj.kobj, mod->name);
+ }
+#endif
+}
+
+static void del_usage_links(struct module *mod)
+{
+#ifdef CONFIG_MODULE_UNLOAD
+ struct module_use *use;
+
+ list_for_each_entry(use, &mod->target_list, target_list)
+ sysfs_remove_link(use->target->holders_dir, mod->name);
+#endif
+}
+
+static int module_add_modinfo_attrs(struct module *mod)
{
struct module_attribute *attr;
struct module_attribute *temp_attr;
return error;
}
-void module_remove_modinfo_attrs(struct module *mod)
+static void module_remove_modinfo_attrs(struct module *mod)
{
struct module_attribute *attr;
int i;
kfree(mod->modinfo_attrs);
}
-int mod_sysfs_init(struct module *mod)
+static int mod_sysfs_init(struct module *mod)
{
int err;
struct kobject *kobj;
return err;
}
-int mod_sysfs_setup(struct module *mod,
+static int mod_sysfs_setup(struct module *mod,
struct kernel_param *kparam,
unsigned int num_params)
{
int err;
+ err = mod_sysfs_init(mod);
+ if (err)
+ goto out;
+
mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
if (!mod->holders_dir) {
err = -ENOMEM;
if (err)
goto out_unreg_param;
+ add_usage_links(mod);
+
kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
return 0;
kobject_put(mod->holders_dir);
out_unreg:
kobject_put(&mod->mkobj.kobj);
+out:
return err;
}
#else /* CONFIG_SYSFS */
+static inline int mod_sysfs_init(struct module *mod)
+{
+ return 0;
+}
+
+static inline int mod_sysfs_setup(struct module *mod,
+ struct kernel_param *kparam,
+ unsigned int num_params)
+{
+ return 0;
+}
+
+static inline int module_add_modinfo_attrs(struct module *mod)
+{
+ return 0;
+}
+
+static inline void module_remove_modinfo_attrs(struct module *mod)
+{
+}
+
static void mod_sysfs_fini(struct module *mod)
{
}
+static void del_usage_links(struct module *mod)
+{
+}
+
#endif /* CONFIG_SYSFS */
static void mod_kobject_remove(struct module *mod)
{
+ del_usage_links(mod);
module_remove_modinfo_attrs(mod);
module_param_sysfs_remove(mod);
kobject_put(mod->mkobj.drivers_dir);
/* Now we've moved module, initialize linked lists, etc. */
module_unload_init(mod);
- /* add kobject, so we can reference it. */
- err = mod_sysfs_init(mod);
- if (err)
- goto free_unload;
-
/* Set up license info based on the info section */
set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
err = mod_sysfs_setup(mod, mod->kp, mod->num_kp);
if (err < 0)
goto unlink;
+
add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
module_arch_cleanup(mod);
cleanup:
free_modinfo(mod);
- kobject_del(&mod->mkobj.kobj);
- kobject_put(&mod->mkobj.kobj);
- free_unload:
module_unload_free(mod);
#if defined(CONFIG_MODULE_UNLOAD)
free_percpu(mod->refptr);
git://bbs.cooldavid.org / net-next-2.6.git / blobdiff