module: add /sys/module/<name>/uevent files
Userspace wants to manage module parameters with udev rules.
This currently only works for loaded modules, but not for
built-in ones.
To allow access to the built-in modules we need to
re-trigger all module load events that happened before any
userspace was running. We already do the same thing for all
devices, subsystems(buses) and drivers.
This adds the currently missing /sys/module/<name>/uevent files
to all module entries.
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (split & trivial fix)
diff --git a/include/linux/module.h b/include/linux/module.h
index b87e762..1c30087 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -75,6 +75,7 @@
extern ssize_t __modver_version_show(struct module_attribute *,
struct module_kobject *, char *);
+extern struct module_attribute module_uevent;
/* These are either module local, or the kernel's dummy ones. */
extern int init_module(void);
diff --git a/kernel/module.c b/kernel/module.c
index a4295e6..04379f92 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -975,10 +975,27 @@
.show = show_initstate,
};
+static ssize_t store_uevent(struct module_attribute *mattr,
+ struct module_kobject *mk,
+ const char *buffer, size_t count)
+{
+ enum kobject_action action;
+
+ if (kobject_action_type(buffer, count, &action) == 0)
+ kobject_uevent(&mk->kobj, action);
+ return count;
+}
+
+struct module_attribute module_uevent = {
+ .attr = { .name = "uevent", .mode = 0200 },
+ .store = store_uevent,
+};
+
static struct module_attribute *modinfo_attrs[] = {
&modinfo_version,
&modinfo_srcversion,
&initstate,
+ &module_uevent,
#ifdef CONFIG_MODULE_UNLOAD
&refcnt,
#endif
diff --git a/kernel/params.c b/kernel/params.c
index 37e9b20..22df3e0 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -730,6 +730,10 @@
mk->kobj.kset = module_kset;
err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL,
"%s", name);
+#ifdef CONFIG_MODULES
+ if (!err)
+ err = sysfs_create_file(&mk->kobj, &module_uevent.attr);
+#endif
if (err) {
kobject_put(&mk->kobj);
printk(KERN_ERR
