Commit 88bfa324 authored by Kay Sievers's avatar Kay Sievers Committed by Rusty Russell
Browse files

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: default avatarKay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (split & trivial fix)
parent 4befb026

include/linux/module.h

+1 −0
Original line number Diff line number Diff line
@@ -75,6 +75,7 @@ struct module_version_attribute { 
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);

kernel/module.c

+17 −0
Original line number Diff line number Diff line
@@ -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

kernel/params.c

+4 −0
Original line number Diff line number Diff line
@@ -730,6 +730,10 @@ static struct module_kobject * __init locate_module_kobject(const char *name) 
		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

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