--- x/fs/kernfs/dir.c
+++ d/fs/kernfs/dir.c
@@ -711,6 +711,7 @@ err_unlock:
 	return NULL;
 }
 
+static void __kernfs_activate(struct kernfs_node *);
 /**
  *	kernfs_add_one - add kernfs_node to parent without warning
  *	@kn: kernfs_node to be added
@@ -762,8 +763,6 @@ int kernfs_add_one(struct kernfs_node *k
 		ps_iattr->ia_mtime = ps_iattr->ia_ctime;
 	}
 
-	up_write(&root->kernfs_rwsem);
-
 	/*
 	 * Activate the new node unless CREATE_DEACTIVATED is requested.
 	 * If not activated here, the kernfs user is responsible for
@@ -772,7 +771,9 @@ int kernfs_add_one(struct kernfs_node *k
 	 * trigger deactivation.
 	 */
 	if (!(kernfs_root(kn)->flags & KERNFS_ROOT_CREATE_DEACTIVATED))
-		kernfs_activate(kn);
+		__kernfs_activate(kn);
+
+	up_write(&root->kernfs_rwsem);
 	return 0;
 
 out_unlock:
@@ -1304,6 +1305,24 @@ static struct kernfs_node *kernfs_next_d
 	return pos->parent;
 }
 
+static void __kernfs_activate(struct kernfs_node *kn)
+{
+	struct kernfs_node *pos;
+	struct kernfs_root *root = kernfs_root(kn);
+
+	pos = NULL;
+	while ((pos = kernfs_next_descendant_post(pos, kn))) {
+		if (pos->flags & KERNFS_ACTIVATED)
+			continue;
+
+		WARN_ON_ONCE(pos->parent && RB_EMPTY_NODE(&pos->rb));
+		WARN_ON_ONCE(atomic_read(&pos->active) != KN_DEACTIVATED_BIAS);
+
+		atomic_sub(KN_DEACTIVATED_BIAS, &pos->active);
+		pos->flags |= KERNFS_ACTIVATED;
+	}
+}
+
 /**
  * kernfs_activate - activate a node which started deactivated
  * @kn: kernfs_node whose subtree is to be activated
@@ -1319,23 +1338,10 @@ static struct kernfs_node *kernfs_next_d
  */
 void kernfs_activate(struct kernfs_node *kn)
 {
-	struct kernfs_node *pos;
 	struct kernfs_root *root = kernfs_root(kn);
 
 	down_write(&root->kernfs_rwsem);
-
-	pos = NULL;
-	while ((pos = kernfs_next_descendant_post(pos, kn))) {
-		if (pos->flags & KERNFS_ACTIVATED)
-			continue;
-
-		WARN_ON_ONCE(pos->parent && RB_EMPTY_NODE(&pos->rb));
-		WARN_ON_ONCE(atomic_read(&pos->active) != KN_DEACTIVATED_BIAS);
-
-		atomic_sub(KN_DEACTIVATED_BIAS, &pos->active);
-		pos->flags |= KERNFS_ACTIVATED;
-	}
-
+	__kernfs_activate(kn);
 	up_write(&root->kernfs_rwsem);
 }