string: factorize skip_spaces and export it to be generally available

[safe/jmp/linux-2.6] / lib / kobject.c

diff --git a/lib/kobject.c b/lib/kobject.c
index fbf0ae2..b512b74 100644 (file)
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -212,12 +212,15 @@ static int kobject_add_internal(struct kobject *kobj)
  * @fmt: format string used to build the name
  * @vargs: vargs to format the string.
  */
-static int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
+int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
                                  va_list vargs)
 {
        const char *old_name = kobj->name;
        char *s;
 
+       if (kobj->name && !fmt)
+               return 0;
+
        kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs);
        if (!kobj->name)
                return -ENOMEM;
@@ -387,11 +390,17 @@ EXPORT_SYMBOL_GPL(kobject_init_and_add);
  * kobject_rename - change the name of an object
  * @kobj: object in question.
  * @new_name: object's new name
+ *
+ * It is the responsibility of the caller to provide mutual
+ * exclusion between two different calls of kobject_rename
+ * on the same kobject and to ensure that new_name is valid and
+ * won't conflict with other kobjects.
  */
 int kobject_rename(struct kobject *kobj, const char *new_name)
 {
        int error = 0;
        const char *devpath = NULL;
+       const char *dup_name = NULL, *name;
        char *devpath_string = NULL;
        char *envp[2];
 
@@ -401,19 +410,6 @@ int kobject_rename(struct kobject *kobj, const char *new_name)
        if (!kobj->parent)
                return -EINVAL;
 
-       /* see if this name is already in use */
-       if (kobj->kset) {
-               struct kobject *temp_kobj;
-               temp_kobj = kset_find_obj(kobj->kset, new_name);
-               if (temp_kobj) {
-                       printk(KERN_WARNING "kobject '%s' cannot be renamed "
-                              "to '%s' as '%s' is already in existence.\n",
-                              kobject_name(kobj), new_name, new_name);
-                       kobject_put(temp_kobj);
-                       return -EINVAL;
-               }
-       }
-
        devpath = kobject_get_path(kobj, GFP_KERNEL);
        if (!devpath) {
                error = -ENOMEM;
@@ -428,15 +424,27 @@ int kobject_rename(struct kobject *kobj, const char *new_name)
        envp[0] = devpath_string;
        envp[1] = NULL;
 
+       name = dup_name = kstrdup(new_name, GFP_KERNEL);
+       if (!name) {
+               error = -ENOMEM;
+               goto out;
+       }
+
        error = sysfs_rename_dir(kobj, new_name);
+       if (error)
+               goto out;
+
+       /* Install the new kobject name */
+       dup_name = kobj->name;
+       kobj->name = name;
 
        /* This function is mostly/only used for network interface.
         * Some hotplug package track interfaces by their name and
         * therefore want to know when the name is changed by the user. */
-       if (!error)
-               kobject_uevent_env(kobj, KOBJ_MOVE, envp);
+       kobject_uevent_env(kobj, KOBJ_MOVE, envp);
 
 out:
+       kfree(dup_name);
        kfree(devpath_string);
        kfree(devpath);
        kobject_put(kobj);
@@ -785,11 +793,16 @@ static struct kset *kset_create(const char *name,
                                struct kobject *parent_kobj)
 {
        struct kset *kset;
+       int retval;
 
        kset = kzalloc(sizeof(*kset), GFP_KERNEL);
        if (!kset)
                return NULL;
-       kobject_set_name(&kset->kobj, name);
+       retval = kobject_set_name(&kset->kobj, name);
+       if (retval) {
+               kfree(kset);
+               return NULL;
+       }
        kset->uevent_ops = uevent_ops;
        kset->kobj.parent = parent_kobj;