From kay.sievers@vrfy.org Sun Nov 26 01:41:34 2006 From: Kay Sievers Subject: Driver core: show drivers in /sys/module/ Date: Fri, 24 Nov 2006 12:15:25 +0100 Message-Id: <1164366925.3468.34.camel@pim.off.vrfy.org> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Status: RO Content-Length: 2574 Show the drivers, which belong to the module: $ ls -l /sys/module/usbcore/drivers/ hub -> ../../../bus/usb/drivers/hub usb -> ../../../bus/usb/drivers/usb usbfs -> ../../../bus/usb/drivers/usbfs Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- include/linux/module.h | 1 + kernel/module.c | 31 +++++++++++++++++++++++++------ 2 files changed, 26 insertions(+), 6 deletions(-) --- gregkh-2.6.orig/include/linux/module.h +++ gregkh-2.6/include/linux/module.h @@ -264,6 +264,7 @@ struct module struct module_attribute *modinfo_attrs; const char *version; const char *srcversion; + struct kobject *drivers_dir; /* Exported symbols */ const struct kernel_symbol *syms; --- gregkh-2.6.orig/kernel/module.c +++ gregkh-2.6/kernel/module.c @@ -1111,22 +1111,35 @@ static int mod_sysfs_setup(struct module goto out; kobj_set_kset_s(&mod->mkobj, module_subsys); mod->mkobj.mod = mod; - err = kobject_register(&mod->mkobj.kobj); + + /* delay uevent until full sysfs population */ + kobject_init(&mod->mkobj.kobj); + err = kobject_add(&mod->mkobj.kobj); if (err) goto out; + mod->drivers_dir = kobject_add_dir(&mod->mkobj.kobj, "drivers"); + if (!mod->drivers_dir) + goto out_unreg; + err = module_param_sysfs_setup(mod, kparam, num_params); if (err) - goto out_unreg; + goto out_unreg_drivers; err = module_add_modinfo_attrs(mod); if (err) - goto out_unreg; + goto out_unreg_param; + kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); return 0; +out_unreg_drivers: + kobject_unregister(mod->drivers_dir); +out_unreg_param: + module_param_sysfs_remove(mod); out_unreg: - kobject_unregister(&mod->mkobj.kobj); + kobject_del(&mod->mkobj.kobj); + kobject_put(&mod->mkobj.kobj); out: return err; } @@ -1135,6 +1148,7 @@ static void mod_kobject_remove(struct mo { module_remove_modinfo_attrs(mod); module_param_sysfs_remove(mod); + kobject_unregister(mod->drivers_dir); kobject_unregister(&mod->mkobj.kobj); } @@ -2300,11 +2314,14 @@ void print_modules(void) void module_add_driver(struct module *mod, struct device_driver *drv) { + int no_warn; + if (!mod || !drv) return; - /* Don't check return code; this call is idempotent */ - sysfs_create_link(&drv->kobj, &mod->mkobj.kobj, "module"); + /* Don't check return codes; these calls are idempotent */ + no_warn = sysfs_create_link(&drv->kobj, &mod->mkobj.kobj, "module"); + no_warn = sysfs_create_link(mod->drivers_dir, &drv->kobj, drv->name); } EXPORT_SYMBOL(module_add_driver); @@ -2313,6 +2330,8 @@ void module_remove_driver(struct device_ if (!drv) return; sysfs_remove_link(&drv->kobj, "module"); + if (drv->owner && drv->owner->drivers_dir) + sysfs_remove_link(drv->owner->drivers_dir, drv->name); } EXPORT_SYMBOL(module_remove_driver);