diff options
Diffstat (limited to 'kernel/module.c')
| -rw-r--r-- | kernel/module.c | 103 |
1 files changed, 95 insertions, 8 deletions
diff --git a/kernel/module.c b/kernel/module.c index f0166563c60..d0f2260a021 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -34,10 +34,10 @@ #include <linux/err.h> #include <linux/vermagic.h> #include <linux/notifier.h> +#include <linux/sched.h> #include <linux/stop_machine.h> #include <linux/device.h> #include <linux/string.h> -#include <linux/sched.h> #include <linux/mutex.h> #include <linux/unwind.h> #include <asm/uaccess.h> @@ -790,6 +790,19 @@ static struct module_attribute refcnt = { .show = show_refcnt, }; +void module_put(struct module *module) +{ + if (module) { + unsigned int cpu = get_cpu(); + local_dec(&module->ref[cpu].count); + /* Maybe they're waiting for us to drop reference? */ + if (unlikely(!module_is_live(module))) + wake_up_process(module->waiter); + put_cpu(); + } +} +EXPORT_SYMBOL(module_put); + #else /* !CONFIG_MODULE_UNLOAD */ static void print_unload_info(struct seq_file *m, struct module *mod) { @@ -811,9 +824,34 @@ static inline void module_unload_init(struct module *mod) } #endif /* CONFIG_MODULE_UNLOAD */ +static ssize_t show_initstate(struct module_attribute *mattr, + struct module *mod, char *buffer) +{ + const char *state = "unknown"; + + switch (mod->state) { + case MODULE_STATE_LIVE: + state = "live"; + break; + case MODULE_STATE_COMING: + state = "coming"; + break; + case MODULE_STATE_GOING: + state = "going"; + break; + } + return sprintf(buffer, "%s\n", state); +} + +static struct module_attribute initstate = { + .attr = { .name = "initstate", .mode = 0444, .owner = THIS_MODULE }, + .show = show_initstate, +}; + static struct module_attribute *modinfo_attrs[] = { &modinfo_version, &modinfo_srcversion, + &initstate, #ifdef CONFIG_MODULE_UNLOAD &refcnt, #endif @@ -1086,22 +1124,37 @@ static int mod_sysfs_setup(struct module *mod, 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) { + err = -ENOMEM; + 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_param: + module_param_sysfs_remove(mod); +out_unreg_drivers: + kobject_unregister(mod->drivers_dir); out_unreg: - kobject_unregister(&mod->mkobj.kobj); + kobject_del(&mod->mkobj.kobj); + kobject_put(&mod->mkobj.kobj); out: return err; } @@ -1110,6 +1163,7 @@ static void mod_kobject_remove(struct module *mod) { module_remove_modinfo_attrs(mod); module_param_sysfs_remove(mod); + kobject_unregister(mod->drivers_dir); kobject_unregister(&mod->mkobj.kobj); } @@ -2182,7 +2236,7 @@ static int m_show(struct seq_file *m, void *p) Where refcount is a number or -, and deps is a comma-separated list of depends or -. */ -struct seq_operations modules_op = { +const struct seq_operations modules_op = { .start = m_start, .next = m_next, .stop = m_stop, @@ -2273,21 +2327,54 @@ void print_modules(void) printk("\n"); } +static char *make_driver_name(struct device_driver *drv) +{ + char *driver_name; + + driver_name = kmalloc(strlen(drv->name) + strlen(drv->bus->name) + 2, + GFP_KERNEL); + if (!driver_name) + return NULL; + + sprintf(driver_name, "%s:%s", drv->bus->name, drv->name); + return driver_name; +} + void module_add_driver(struct module *mod, struct device_driver *drv) { + char *driver_name; + 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"); + driver_name = make_driver_name(drv); + if (driver_name) { + no_warn = sysfs_create_link(mod->drivers_dir, &drv->kobj, + driver_name); + kfree(driver_name); + } } EXPORT_SYMBOL(module_add_driver); void module_remove_driver(struct device_driver *drv) { + char *driver_name; + if (!drv) return; + sysfs_remove_link(&drv->kobj, "module"); + if (drv->owner && drv->owner->drivers_dir) { + driver_name = make_driver_name(drv); + if (driver_name) { + sysfs_remove_link(drv->owner->drivers_dir, + driver_name); + kfree(driver_name); + } + } } EXPORT_SYMBOL(module_remove_driver); |