From patchwork Tue Sep 1 15:10:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 264775 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD099C43461 for ; Tue, 1 Sep 2020 15:26:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 949C020684 for ; Tue, 1 Sep 2020 15:26:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598974010; bh=bZjcRrkVeA5Zn39rFdcYQ54ruLpIUzuxdUhIILvQWvM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=uF8hI4sI03LIdJElM7/upo5jbAgn5LMGFLYRY9iHQ3aSPswqb8OMEXkaumx8f9rC2 6TNKEP9JL6lFRN/yZe6PswUYcdiURsDN+S1xSZp8Wavrnq89AY+5DtumCpN/Q7oG06 zoNXHxVw9+1G3rdJ1SGJMunWnWZffqwrmP15AMa8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729790AbgIAP0t (ORCPT ); Tue, 1 Sep 2020 11:26:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:52656 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730113AbgIAP0n (ORCPT ); Tue, 1 Sep 2020 11:26:43 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 49A2D20684; Tue, 1 Sep 2020 15:26:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598974001; bh=bZjcRrkVeA5Zn39rFdcYQ54ruLpIUzuxdUhIILvQWvM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bEjs4cmcTM4+dnNXb4C+iQn/Z02jjJhL88Dw9XJ/F8WpGSVUtgZEhPJV8GAJQ2ZM8 63aLNvdv3zy2mBUdkjiz1IIodb+5rZNbMEhRkuz6j3BZRKPN3oq6COiyO0Zgv5MHbi s/Moq2X8VokLN65GWcY95x8icpsoLdPbB0YA7IVk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Heikki Krogerus , "Rafael J. Wysocki" Subject: [PATCH 4.19 102/125] device property: Fix the secondary firmware node handling in set_primary_fwnode() Date: Tue, 1 Sep 2020 17:10:57 +0200 Message-Id: <20200901150939.604602306@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901150934.576210879@linuxfoundation.org> References: <20200901150934.576210879@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Heikki Krogerus commit c15e1bdda4365a5f17cdadf22bf1c1df13884a9e upstream. When the primary firmware node pointer is removed from a device (set to NULL) the secondary firmware node pointer, when it exists, is made the primary node for the device. However, the secondary firmware node pointer of the original primary firmware node is never cleared (set to NULL). To avoid situation where the secondary firmware node pointer is pointing to a non-existing object, clearing it properly when the primary node is removed from a device in set_primary_fwnode(). Fixes: 97badf873ab6 ("device property: Make it possible to use secondary firmware nodes") Cc: All applicable Signed-off-by: Heikki Krogerus Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- drivers/base/core.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -3333,9 +3333,9 @@ static inline bool fwnode_is_primary(str */ void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode) { - if (fwnode) { - struct fwnode_handle *fn = dev->fwnode; + struct fwnode_handle *fn = dev->fwnode; + if (fwnode) { if (fwnode_is_primary(fn)) fn = fn->secondary; @@ -3345,8 +3345,12 @@ void set_primary_fwnode(struct device *d } dev->fwnode = fwnode; } else { - dev->fwnode = fwnode_is_primary(dev->fwnode) ? - dev->fwnode->secondary : NULL; + if (fwnode_is_primary(fn)) { + dev->fwnode = fn->secondary; + fn->secondary = NULL; + } else { + dev->fwnode = NULL; + } } } EXPORT_SYMBOL_GPL(set_primary_fwnode);