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)

1 files changed, 17 insertions, 0 deletions

diff --git a/kernel/module.c b/kernel/module.c
index a4295e67dd83..04379f92f843 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -975,10 +975,27 @@ static struct module_attribute initstate = {
         .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