4 files changed, 165 insertions, 33 deletions

diff --git a/kernel/kmod.c b/kernel/kmod.c
index 796276141e51..9f923f8ce6a0 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -36,6 +36,8 @@
 #include <linux/resource.h>
 #include <asm/uaccess.h>
 
+extern int delete_module(const char *name, unsigned int flags);
+
 extern int max_threads;
 
 static struct workqueue_struct *khelper_wq;
@@ -46,6 +48,7 @@ static struct workqueue_struct *khelper_wq;
         modprobe_path is set via /proc/sys.
 */
 char modprobe_path[KMOD_PATH_LEN] = "/sbin/modprobe";
+struct module_kobject kmod_mk;
 
 /**
  * request_module - try to load a kernel module
@@ -75,6 +78,11 @@ int request_module(const char *fmt, ...)
         static atomic_t kmod_concurrent = ATOMIC_INIT(0);
 #define MAX_KMOD_CONCURRENT 50  /* Completely arbitrary value - KAO */
         static int kmod_loop_msg;
+        char modalias[16 + MODULE_NAME_LEN] = "MODALIAS=";
+        char *uevent_envp[2] = {
+                modalias,
+                NULL
+        };
 
         va_start(args, fmt);
         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
@@ -82,6 +90,12 @@ int request_module(const char *fmt, ...)
         if (ret >= MODULE_NAME_LEN)
                 return -ENAMETOOLONG;
 
+        strcpy(&modalias[strlen("MODALIAS=")], module_name);
+        kobject_uevent_env(&kmod_mk.kobj, KOBJ_CHANGE, uevent_envp);
+
+        if (modprobe_path[0] == '\0')
+                goto out;
+
         /* If modprobe needs a service that is in a module, we get a recursive
          * loop.  Limit the number of running kmod threads to max_threads/2 or
          * MAX_KMOD_CONCURRENT, whichever is the smaller.  A cleaner method
@@ -108,9 +122,115 @@ int request_module(const char *fmt, ...)
 
         ret = call_usermodehelper(modprobe_path, argv, envp, 1);
         atomic_dec(&kmod_concurrent);
+out:
         return ret;
 }
 EXPORT_SYMBOL(request_module);
+
+static ssize_t store_mod_request(struct module_attribute *mattr,
+                                 struct module *mod,
+                              const char *buffer, size_t count)
+{
+        char name[MODULE_NAME_LEN];
+        int ret;
+
+        if (count < 1 || count+1 > MODULE_NAME_LEN)
+                return -EINVAL;
+        memcpy(name, buffer, count);
+        name[count] = '\0';
+        if (name[count-1] == '\n')
+                name[count-1] = '\0';
+
+        ret = request_module(name);
+        if (ret < 0)
+                return ret;
+        return count;
+}
+
+static struct module_attribute mod_request = {
+        .attr = { .name = "mod_request", .mode = S_IWUSR, .owner = THIS_MODULE },
+        .store = store_mod_request,
+};
+
+#ifdef CONFIG_MODULE_UNLOAD
+static ssize_t store_mod_unload(struct module_attribute *mattr,
+                            struct module *mod,
+                            const char *buffer, size_t count)
+{
+        char name[MODULE_NAME_LEN];
+        int ret;
+
+        if (count < 1 || count+1 > MODULE_NAME_LEN)
+                return -EINVAL;
+        memcpy(name, buffer, count);
+        name[count] = '\0';
+        if (name[count-1] == '\n')
+                name[count-1] = '\0';
+
+        ret = delete_module(name, O_NONBLOCK);
+        if (ret < 0)
+                return ret;
+        return count;
+}
+
+static struct module_attribute mod_unload = {
+        .attr = { .name = "mod_unload", .mode = S_IWUSR, .owner = THIS_MODULE },
+        .store = store_mod_unload,
+};
+#endif
+
+static ssize_t show_mod_request_helper(struct module_attribute *mattr,
+                                       struct module *mod,
+                                       char *buffer)
+{
+        return sprintf(buffer, "%s\n", modprobe_path);
+}
+
+static ssize_t store_mod_request_helper(struct module_attribute *mattr,
+                                        struct module *mod,
+                                        const char *buffer, size_t count)
+{
+        if (count < 1 || count+1 > KMOD_PATH_LEN)
+                return -EINVAL;
+        memcpy(modprobe_path, buffer, count);
+        modprobe_path[count] = '\0';
+        if (modprobe_path[count-1] == '\n')
+                modprobe_path[count-1] = '\0';
+        return count;
+}
+
+static struct module_attribute mod_request_helper = {
+        .attr = {
+                .name = "mod_request_helper",
+                .mode = S_IWUSR | S_IRUGO,
+                .owner = THIS_MODULE
+        },
+        .show = show_mod_request_helper,
+        .store = store_mod_request_helper,
+};
+
+void __init kmod_sysfs_init(void)
+{
+        int ret;
+
+        kmod_mk.mod = THIS_MODULE;
+        kobj_set_kset_s(&kmod_mk, module_subsys);
+        kobject_set_name(&kmod_mk.kobj, "kmod");
+        kobject_init(&kmod_mk.kobj);
+        ret = kobject_add(&kmod_mk.kobj);
+        if (ret < 0)
+                goto out;
+
+        ret = sysfs_create_file(&kmod_mk.kobj, &mod_request_helper.attr);
+        ret = sysfs_create_file(&kmod_mk.kobj, &mod_request.attr);
+#ifdef CONFIG_MODULE_UNLOAD
+        ret = sysfs_create_file(&kmod_mk.kobj, &mod_unload.attr);
+#endif
+
+        kobject_uevent(&kmod_mk.kobj, KOBJ_ADD);
+out:
+        return;
+}
 #endif /* CONFIG_KMOD */
 
 struct subprocess_info {
diff --git a/kernel/module.c b/kernel/module.c
index 8a94e054230c..8c25b1a04fa6 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -653,20 +653,11 @@ static void wait_for_zero_refcount(struct module *mod)
         mutex_lock(&module_mutex);
 }
 
-asmlinkage long
-sys_delete_module(const char __user *name_user, unsigned int flags)
+int delete_module(const char *name, unsigned int flags)
 {
         struct module *mod;
-        char name[MODULE_NAME_LEN];
         int ret, forced = 0;
 
-        if (!capable(CAP_SYS_MODULE))
-                return -EPERM;
-
-        if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
-                return -EFAULT;
-        name[MODULE_NAME_LEN-1] = '\0';
-
         if (mutex_lock_interruptible(&module_mutex) != 0)
                 return -EINTR;
 
@@ -727,6 +718,21 @@ sys_delete_module(const char __user *name_user, unsigned int flags)
         return ret;
 }
 
+asmlinkage long
+sys_delete_module(const char __user *name_user, unsigned int flags)
+{
+        char name[MODULE_NAME_LEN];
+
+        if (!capable(CAP_SYS_MODULE))
+                return -EPERM;
+
+        if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
+                return -EFAULT;
+        name[MODULE_NAME_LEN-1] = '\0';
+
+        return delete_module(name, flags);
+}
+
 static void print_unload_info(struct seq_file *m, struct module *mod)
 {
         struct module_use *use;
@@ -1068,7 +1074,8 @@ static inline void remove_sect_attrs(struct module *mod)
 }
 #endif /* CONFIG_KALLSYMS */
 
-static int module_add_modinfo_attrs(struct module *mod)
+#ifdef CONFIG_SYSFS
+int module_add_modinfo_attrs(struct module *mod)
 {
         struct module_attribute *attr;
         struct module_attribute *temp_attr;
@@ -1094,7 +1101,7 @@ static int module_add_modinfo_attrs(struct module *mod)
         return error;
 }
 
-static void module_remove_modinfo_attrs(struct module *mod)
+void module_remove_modinfo_attrs(struct module *mod)
 {
         struct module_attribute *attr;
         int i;
@@ -1109,8 +1116,10 @@ static void module_remove_modinfo_attrs(struct module *mod)
         }
         kfree(mod->modinfo_attrs);
 }
+#endif
 
-static int mod_sysfs_init(struct module *mod)
+#ifdef CONFIG_SYSFS
+int mod_sysfs_init(struct module *mod)
 {
         int err;
 
@@ -1133,7 +1142,7 @@ out:
         return err;
 }
 
-static int mod_sysfs_setup(struct module *mod,
+int mod_sysfs_setup(struct module *mod,
                            struct kernel_param *kparam,
                            unsigned int num_params)
 {
@@ -1169,16 +1178,14 @@ out_unreg:
 out:
         return err;
 }
+#endif
 
 static void mod_kobject_remove(struct module *mod)
 {
         module_remove_modinfo_attrs(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.drivers_dir);
+        kobject_unregister(mod->holders_dir);
         kobject_unregister(&mod->mkobj.kobj);
 }
 
@@ -2345,6 +2352,7 @@ void print_modules(void)
         printk("\n");
 }
 
+#ifdef CONFIG_SYSFS
 static char *make_driver_name(struct device_driver *drv)
 {
         char *driver_name;
@@ -2419,6 +2427,7 @@ void module_remove_driver(struct device_driver *drv)
         }
 }
 EXPORT_SYMBOL(module_remove_driver);
+#endif
 
 #ifdef CONFIG_MODVERSIONS
 /* Generate the signature for struct module here, too, for modversions. */
diff --git a/kernel/params.c b/kernel/params.c
index 553cf7d6a4be..7a751570b56d 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -30,8 +30,6 @@
 #define DEBUGP(fmt, a...)
 #endif
 
-static struct kobj_type module_ktype;
-
 static inline char dash2underscore(char c)
 {
         if (c == '-')
@@ -391,6 +389,7 @@ struct module_param_attrs
         struct param_attribute attrs[0];
 };
 
+#ifdef CONFIG_SYSFS
 #define to_param_attr(n) container_of(n, struct param_attribute, mattr);
 
 static ssize_t param_attr_show(struct module_attribute *mattr,
@@ -426,6 +425,7 @@ static ssize_t param_attr_store(struct module_attribute *mattr,
                 return len;
         return err;
 }
+#endif
 
 #ifdef CONFIG_MODULES
 #define __modinit
@@ -433,6 +433,7 @@ static ssize_t param_attr_store(struct module_attribute *mattr,
 #define __modinit __init
 #endif
 
+#ifdef CONFIG_SYSFS
 /*
  * param_sysfs_setup - setup sysfs support for one module or KBUILD_MODNAME
  * @mk: struct module_kobject (contains parent kobject)
@@ -500,9 +501,7 @@ param_sysfs_setup(struct module_kobject *mk,
         return mp;
 }
 
-
 #ifdef CONFIG_MODULES
-
 /*
  * module_param_sysfs_setup - setup sysfs support for one module
  * @mod: module
@@ -625,7 +624,6 @@ static void __init param_sysfs_builtin(void)
 
 
 /* module-related sysfs stuff */
-#ifdef CONFIG_SYSFS
 
 #define to_module_attr(n) container_of(n, struct module_attribute, attr);
 #define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
@@ -673,6 +671,8 @@ static struct sysfs_ops module_sysfs_ops = {
         .store = module_attr_store,
 };
 
+static struct kobj_type module_ktype;
+
 static int uevent_filter(struct kset *kset, struct kobject *kobj)
 {
         struct kobj_type *ktype = get_ktype(kobj);
@@ -686,19 +686,12 @@ static struct kset_uevent_ops module_uevent_ops = {
         .filter = uevent_filter,
 };
 
-#else
-static struct sysfs_ops module_sysfs_ops = {
-        .show = NULL,
-        .store = NULL,
-};
-#endif
+decl_subsys(module, &module_ktype, &module_uevent_ops);
 
 static struct kobj_type module_ktype = {
         .sysfs_ops =    &module_sysfs_ops,
 };
 
-decl_subsys(module, &module_ktype, &module_uevent_ops);
-
 /*
  * param_sysfs_init - wrapper for built-in params support
  */
@@ -714,11 +707,21 @@ static int __init param_sysfs_init(void)
         }
 
         param_sysfs_builtin();
+        kmod_sysfs_init();
 
         return 0;
 }
 subsys_initcall(param_sysfs_init);
 
+#else
+#if 0
+static struct sysfs_ops module_sysfs_ops = {
+        .show = NULL,
+        .store = NULL,
+};
+#endif
+#endif
+
 EXPORT_SYMBOL(param_set_byte);
 EXPORT_SYMBOL(param_get_byte);
 EXPORT_SYMBOL(param_set_short);
diff --git a/kernel/printk.c b/kernel/printk.c
index 0c151877ff71..4b47e59248df 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -54,7 +54,7 @@ int console_printk[4] = {
 };
 
 /*
- * Low lever drivers may need that to know if they can schedule in
+ * Low level drivers may need that to know if they can schedule in
  * their unblank() callback or not. So let's export it.
  */
 int oops_in_progress;