From: Kay Sievers <[email protected]>
/sys/module/usbcore/
|-- drivers
| |-- usb:hub -> ../../../subsystem/usb/drivers/hub
| |-- usb:usb -> ../../../subsystem/usb/drivers/usb
| `-- usb:usbfs -> ../../../subsystem/usb/drivers/usbfs
|-- holders
| |-- ehci_hcd -> ../../../module/ehci_hcd
| |-- uhci_hcd -> ../../../module/uhci_hcd
| |-- usb_storage -> ../../../module/usb_storage
| `-- usbhid -> ../../../module/usbhid
|-- initstate
Signed-off-by: Kay Sievers <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
include/linux/module.h | 1 +
kernel/module.c | 37 +++++++++++++++++++++++++++++++------
kernel/params.c | 17 ++++++++++++++++-
3 files changed, 48 insertions(+), 7 deletions(-)
diff --git a/include/linux/module.h b/include/linux/module.h
index 90dc254..419d3ef 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -264,6 +264,7 @@ struct module
struct module_attribute *modinfo_attrs;
const char *version;
const char *srcversion;
+ struct kobject *holders_dir;
/* Exported symbols */
const struct kernel_symbol *syms;
diff --git a/kernel/module.c b/kernel/module.c
index 9de4209..8a94e05 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -537,6 +537,8 @@ static int already_uses(struct module *a, struct module *b)
static int use_module(struct module *a, struct module *b)
{
struct module_use *use;
+ int no_warn;
+
if (b == NULL || already_uses(a, b)) return 1;
if (!strong_try_module_get(b))
@@ -552,6 +554,7 @@ static int use_module(struct module *a, struct module *b)
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;
}
@@ -569,6 +572,7 @@ static void module_unload_free(struct module *mod)
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;
}
@@ -1106,9 +1110,7 @@ static void module_remove_modinfo_attrs(struct module *mod)
kfree(mod->modinfo_attrs);
}
-static int mod_sysfs_setup(struct module *mod,
- struct kernel_param *kparam,
- unsigned int num_params)
+static int mod_sysfs_init(struct module *mod)
{
int err;
@@ -1125,15 +1127,30 @@ static int mod_sysfs_setup(struct module *mod,
kobj_set_kset_s(&mod->mkobj, module_subsys);
mod->mkobj.mod = mod;
- /* delay uevent until full sysfs population */
kobject_init(&mod->mkobj.kobj);
+
+out:
+ return err;
+}
+
+static int mod_sysfs_setup(struct module *mod,
+ struct kernel_param *kparam,
+ unsigned int num_params)
+{
+ int err;
+
+ /* delay uevent until full sysfs population */
err = kobject_add(&mod->mkobj.kobj);
if (err)
goto out;
+ mod->holders_dir = kobject_add_dir(&mod->mkobj.kobj, "holders");
+ if (!mod->holders_dir)
+ goto out_unreg;
+
err = module_param_sysfs_setup(mod, kparam, num_params);
if (err)
- goto out_unreg_drivers;
+ goto out_unreg_holders;
err = module_add_modinfo_attrs(mod);
if (err)
@@ -1144,7 +1161,9 @@ static int mod_sysfs_setup(struct module *mod,
out_unreg_param:
module_param_sysfs_remove(mod);
-out_unreg_drivers:
+out_unreg_holders:
+ kobject_unregister(mod->holders_dir);
+out_unreg:
kobject_del(&mod->mkobj.kobj);
kobject_put(&mod->mkobj.kobj);
out:
@@ -1157,6 +1176,8 @@ static void mod_kobject_remove(struct module *mod)
module_param_sysfs_remove(mod);
if (mod->mkobj.drivers_dir)
kobject_unregister(mod->mkobj.drivers_dir);
+ if (mod->holders_dir)
+ kobject_unregister(mod->holders_dir);
kobject_unregister(&mod->mkobj.kobj);
}
@@ -1761,6 +1782,10 @@ static struct module *load_module(void __user *umod,
/* Now we've moved module, initialize linked lists, etc. */
module_unload_init(mod);
+ /* Initialize kobject, so we can reference it. */
+ if (mod_sysfs_init(mod) != 0)
+ goto cleanup;
+
/* Set up license info based on the info section */
set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
diff --git a/kernel/params.c b/kernel/params.c
index cbaac85..553cf7d 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -30,6 +30,8 @@
#define DEBUGP(fmt, a...)
#endif
+static struct kobj_type module_ktype;
+
static inline char dash2underscore(char c)
{
if (c == '-')
@@ -671,6 +673,19 @@ static struct sysfs_ops module_sysfs_ops = {
.store = module_attr_store,
};
+static int uevent_filter(struct kset *kset, struct kobject *kobj)
+{
+ struct kobj_type *ktype = get_ktype(kobj);
+
+ if (ktype == &module_ktype)
+ return 1;
+ return 0;
+}
+
+static struct kset_uevent_ops module_uevent_ops = {
+ .filter = uevent_filter,
+};
+
#else
static struct sysfs_ops module_sysfs_ops = {
.show = NULL,
@@ -682,7 +697,7 @@ static struct kobj_type module_ktype = {
.sysfs_ops = &module_sysfs_ops,
};
-decl_subsys(module, &module_ktype, NULL);
+decl_subsys(module, &module_ktype, &module_uevent_ops);
/*
* param_sysfs_init - wrapper for built-in params support
--
1.4.4.4
-
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