X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fkobject.c;h=82dc34c095c25ea0e14619d68bda9d3942836bd5;hb=207032051a5ed38df332729ba42e98e9a1e60434;hp=f07c57252e823278f6dd50b8ca84eb8e747f597f;hpb=61be7fdec2f51b99570cd5dcc30c7848c8e56513;p=pandora-kernel.git

diff --git a/lib/kobject.c b/lib/kobject.c
index f07c57252e82..82dc34c095c2 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -745,18 +745,57 @@ void kset_unregister(struct kset *k)
  * take a reference and return the object.
  */
 struct kobject *kset_find_obj(struct kset *kset, const char *name)
+{
+	return kset_find_obj_hinted(kset, name, NULL);
+}
+
+/**
+ * kset_find_obj_hinted - search for object in kset given a predecessor hint.
+ * @kset: kset we're looking in.
+ * @name: object's name.
+ * @hint: hint to possible object's predecessor.
+ *
+ * Check the hint's next object and if it is a match return it directly,
+ * otherwise, fall back to the behavior of kset_find_obj().  Either way
+ * a reference for the returned object is held and the reference on the
+ * hinted object is released.
+ */
+struct kobject *kset_find_obj_hinted(struct kset *kset, const char *name,
+				     struct kobject *hint)
 {
 	struct kobject *k;
 	struct kobject *ret = NULL;
 
 	spin_lock(&kset->list_lock);
+
+	if (!hint)
+		goto slow_search;
+
+	/* end of list detection */
+	if (hint->entry.next == kset->list.next)
+		goto slow_search;
+
+	k = container_of(hint->entry.next, struct kobject, entry);
+	if (!kobject_name(k) || strcmp(kobject_name(k), name))
+		goto slow_search;
+
+	ret = kobject_get(k);
+	goto unlock_exit;
+
+slow_search:
 	list_for_each_entry(k, &kset->list, entry) {
 		if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
 			ret = kobject_get(k);
 			break;
 		}
 	}
+
+unlock_exit:
 	spin_unlock(&kset->list_lock);
+
+	if (hint)
+		kobject_put(hint);
+
 	return ret;
 }