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: 264601 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=unavailable 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 256B2C433E7 for ; Tue, 1 Sep 2020 16:17:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0240D2065F for ; Tue, 1 Sep 2020 16:17:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598977033; bh=kSE9ZyHZgrC5O8JA6ZoprRdJzM38r2e6uDO8v8/zApo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Otu4bbBnvhoyi3UlPA0kptRrpeP/cmvSFZnlh91Eyni+AV3LV737ziVHG9XGIzLDo myZSu3GChL8VYUX3G0gErWqEobeqC2AqdtAR7G6j+eEJooayUHs0axncASRo7rZNuh j1Gr0+S8QY8qvXF0jG5XiayzkfbevPs2a5y+2pcE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727951AbgIAQQy (ORCPT ); Tue, 1 Sep 2020 12:16:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:38614 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728242AbgIAPeA (ORCPT ); Tue, 1 Sep 2020 11:34:00 -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 CEAC021534; Tue, 1 Sep 2020 15:33:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598974439; bh=kSE9ZyHZgrC5O8JA6ZoprRdJzM38r2e6uDO8v8/zApo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FSHNfjftbd5YqHAz5wpL7DD7pYK2R94ge+WgxgF9PMFStiUNcwrHpB4XSnzzNxgHy 8gSSUTn5107P9txZaOtQYoexqbq3EFrQgY4jHynXioxpZTbdJeibtN8m47/I6OuVDU 3m1b9s3oIhyAMALo0LqcH+lSSdf/nZKkMAiA/xEw= 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 5.4 177/214] device property: Fix the secondary firmware node handling in set_primary_fwnode() Date: Tue, 1 Sep 2020 17:10:57 +0200 Message-Id: <20200901151001.455550067@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901150952.963606936@linuxfoundation.org> References: <20200901150952.963606936@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 @@ -3400,9 +3400,9 @@ 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; @@ -3412,8 +3412,12 @@ 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);