kobject: remove the static array for the name

Due to historical reasons, struct kobject contained a static array for
the name, and a dynamic pointer in case the name got bigger than the
array.  That's just dumb, as people didn't always know which variable to
reference, even with the accessor for the kobject name.

This patch removes the static array, potentially saving a lot of memory
as the majority of kobjects do not have a very long name.

Thanks to Kay for the idea to do this.

Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 39 insertions, 40 deletions

diff --git a/lib/kobject.c b/lib/kobject.c
index 1326041..10ae2eb 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -170,7 +170,7 @@ int kobject_shadow_add(struct kobject *kobj, struct sysfs_dirent *shadow_parent)
 	if (!(kobj = kobject_get(kobj)))
 		return -ENOENT;
 	if (!kobj->k_name)
-		kobj->k_name = kobj->name;
+		kobject_set_name(kobj, "NO_NAME");
 	if (!*kobj->k_name) {
 		pr_debug("kobject attempted to be registered with no name!\n");
 		WARN_ON(1);
@@ -181,7 +181,7 @@ int kobject_shadow_add(struct kobject *kobj, struct sysfs_dirent *shadow_parent)
 
 	pr_debug("kobject %s: registering. parent: %s, set: %s\n",
 		 kobject_name(kobj), parent ? kobject_name(parent) : "<NULL>", 
-		 kobj->kset ? kobj->kset->kobj.name : "<NULL>" );
+		 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>" );
 
 	if (kobj->kset) {
 		spin_lock(&kobj->kset->list_lock);
@@ -255,54 +255,50 @@ int kobject_register(struct kobject * kobj)
 int kobject_set_name(struct kobject * kobj, const char * fmt, ...)
 {
 	int error = 0;
-	int limit = KOBJ_NAME_LEN;
+	int limit;
 	int need;
 	va_list args;
-	char * name;
+	char *name;
 
-	/* 
-	 * First, try the static array 
-	 */
-	va_start(args,fmt);
-	need = vsnprintf(kobj->name,limit,fmt,args);
+	/* find out how big a buffer we need */
+	name = kmalloc(1024, GFP_KERNEL);
+	if (!name) {
+		error = -ENOMEM;
+		goto done;
+	}
+	va_start(args, fmt);
+	need = vsnprintf(name, 1024, fmt, args);
 	va_end(args);
-	if (need < limit) 
-		name = kobj->name;
-	else {
-		/* 
-		 * Need more space? Allocate it and try again 
-		 */
-		limit = need + 1;
-		name = kmalloc(limit,GFP_KERNEL);
-		if (!name) {
-			error = -ENOMEM;
-			goto Done;
-		}
-		va_start(args,fmt);
-		need = vsnprintf(name,limit,fmt,args);
-		va_end(args);
-
-		/* Still? Give up. */
-		if (need >= limit) {
-			kfree(name);
-			error = -EFAULT;
-			goto Done;
-		}
+	kfree(name);
+
+	/* Allocate the new space and copy the string in */
+	limit = need + 1;
+	name = kmalloc(limit, GFP_KERNEL);
+	if (!name) {
+		error = -ENOMEM;
+		goto done;
+	}
+	va_start(args, fmt);
+	need = vsnprintf(name, limit, fmt, args);
+	va_end(args);
+
+	/* something wrong with the string we copied? */
+	if (need >= limit) {
+		kfree(name);
+		error = -EFAULT;
+		goto done;
 	}
 
 	/* Free the old name, if necessary. */
-	if (kobj->k_name && kobj->k_name != kobj->name)
-		kfree(kobj->k_name);
+	kfree(kobj->k_name);
 
 	/* Now, set the new name */
 	kobj->k_name = name;
- Done:
+done:
 	return error;
 }
-
 EXPORT_SYMBOL(kobject_set_name);
 
-
 /**
  *	kobject_rename - change the name of an object
  *	@kobj:	object in question.
@@ -477,13 +473,16 @@ void kobject_cleanup(struct kobject * kobj)
 	struct kobj_type * t = get_ktype(kobj);
 	struct kset * s = kobj->kset;
 	struct kobject * parent = kobj->parent;
+	const char *name = kobj->k_name;
 
 	pr_debug("kobject %s: cleaning up\n",kobject_name(kobj));
-	if (kobj->k_name != kobj->name)
-		kfree(kobj->k_name);
-	kobj->k_name = NULL;
-	if (t && t->release)
+	if (t && t->release) {
 		t->release(kobj);
+		/* If we have a release function, we can guess that this was
+		 * not a statically allocated kobject, so we should be safe to
+		 * free the name */
+		kfree(name);
+	}
 	if (s)
 		kset_put(s);
 	kobject_put(parent);