From mboxrd@z Thu Jan 1 00:00:00 1970 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 35C03C433E7 for ; Tue, 1 Sep 2020 15:57:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0558C206EB for ; Tue, 1 Sep 2020 15:57:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598975829; bh=DxqAMXBtBi+lpyycBbxEJvoY8NTVhAWr+ZxGejRWmXA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=qR7kXbsQ8SBQuHbfEfG8kxyuzoXsqlQd0JNTbyU8UnNA8hVsJPzUpxOpv8ZhPMBHb p9AqnXioslru9zXYr8p4sCQhyFx85IaBtweiJwvX9CBD4vXGMhE+U2Bl5pnq60VU+3 7tOgt+I8V3jKrMqWwxQ4zGve6MZs5r8MJ3wjXYIc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731656AbgIAP5H (ORCPT ); Tue, 1 Sep 2020 11:57:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:60550 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731815AbgIAPop (ORCPT ); Tue, 1 Sep 2020 11:44:45 -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 5126C2078B; Tue, 1 Sep 2020 15:44:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598975084; bh=DxqAMXBtBi+lpyycBbxEJvoY8NTVhAWr+ZxGejRWmXA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UEeXud6wlBAuS8lwAlVyAVreyc4uGz72iGXfN+pkULHMVL8Hr94MECmwGWRKwOmB8 oqAEPbw5dNv9MG4K0juNDDTWKSs6o0Angw3epf+yA3z0muxaMQ/TW7ZHNXm8ENPMns yt0MR5uYjuC7bnF3b5uozSWl1fH3TWjaHWVuPmpw= 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 5.8 203/255] device property: Fix the secondary firmware node handling in set_primary_fwnode() Date: Tue, 1 Sep 2020 17:10:59 +0200 Message-Id: <20200901151010.425011611@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901151000.800754757@linuxfoundation.org> References: <20200901151000.800754757@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 @@ -3988,9 +3988,9 @@ 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; @@ -4000,8 +4000,12 @@ 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);