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authorRusty Russell <rusty@rustcorp.com.au>2010-06-05 11:17:36 -0600
committerRusty Russell <rusty@rustcorp.com.au>2010-06-05 11:17:36 +0930
commit80a3d1bb410e000e176931a076cdf19a1e89a955 (patch)
tree6883bbc3b2032d9604374513ccfd496dd63e76ba /kernel
parentc8e21ced08b39ef8dfe7236fb2a923a95f645262 (diff)
downloadlinux-2.6.34-ux500-80a3d1bb410e000e176931a076cdf19a1e89a955.tar.gz
module: move sysfs exposure to end of load_module
This means a little extra work, but is more logical: we don't put anything in sysfs until we're about to put the module into the global list an parse its parameters. This also gives us a logical place to put duplicate module detection in the next patch. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/module.c47
1 files changed, 36 insertions, 11 deletions
diff --git a/kernel/module.c b/kernel/module.c
index bbb1d812c79..c690d988579 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -560,7 +560,6 @@ static int already_uses(struct module *a, struct module *b)
*/
static int add_module_usage(struct module *a, struct module *b)
{
- int no_warn;
struct module_use *use;
DEBUGP("Allocating new usage for %s.\n", a->name);
@@ -574,7 +573,6 @@ static int add_module_usage(struct module *a, struct module *b)
use->target = b;
list_add(&use->source_list, &b->source_list);
list_add(&use->target_list, &a->target_list);
- no_warn = sysfs_create_link(b->holders_dir, &a->mkobj.kobj, a->name);
return 0;
}
@@ -619,7 +617,6 @@ static void module_unload_free(struct module *mod)
list_del(&use->source_list);
list_del(&use->target_list);
kfree(use);
- sysfs_remove_link(i->holders_dir, mod->name);
}
}
@@ -1303,6 +1300,29 @@ static inline void remove_notes_attrs(struct module *mod)
#endif
#ifdef CONFIG_SYSFS
+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
+}
+
int module_add_modinfo_attrs(struct module *mod)
{
struct module_attribute *attr;
@@ -1385,6 +1405,10 @@ int mod_sysfs_setup(struct module *mod,
{
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;
@@ -1399,6 +1423,8 @@ int mod_sysfs_setup(struct module *mod,
if (err)
goto out_unreg_param;
+ add_usage_links(mod);
+
kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
return 0;
@@ -1408,6 +1434,7 @@ out_unreg_holders:
kobject_put(mod->holders_dir);
out_unreg:
kobject_put(&mod->mkobj.kobj);
+out:
return err;
}
@@ -1422,10 +1449,15 @@ 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);
@@ -2242,11 +2274,6 @@ static noinline struct module *load_module(void __user *umod,
/* 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"));
@@ -2443,6 +2470,7 @@ static noinline struct module *load_module(void __user *umod,
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);
@@ -2461,9 +2489,6 @@ static noinline struct module *load_module(void __user *umod,
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);