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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 2FDB2C43381 for ; Fri, 22 Mar 2019 12:58:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F1F2F21873 for ; Fri, 22 Mar 2019 12:58:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553259520; bh=8VO6imNKF8h6IidgpNoaPg68byfQXpDskgbyHhELRR4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FAPd+44/+fCdwh3iV0fXluVawg7nObnosnT3Ud8gdjPzol3RwOWjZOfjzCfTpFMXm L4goZIteQQqrmODsuwBxdIla7TUKjvTkm/UgpqrSEZz//RVa2ZElqt4TjK1giy91aq lIEge+usB0GyI1VTS7m4pMhATbZ7WhpjZlaJamWc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732291AbfCVM6i (ORCPT ); Fri, 22 Mar 2019 08:58:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:49532 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731904AbfCVLqY (ORCPT ); Fri, 22 Mar 2019 07:46:24 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 BCD532075E; Fri, 22 Mar 2019 11:46:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553255183; bh=8VO6imNKF8h6IidgpNoaPg68byfQXpDskgbyHhELRR4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BJO4kMO0J4Lfck9Ek3qqzFVUYvVO68wG0UX9yn2dDbj0MUjTbUpcH9+Jy06/mmYhi LxCDxLF1wVm4WYXfkhorCR0qw1BAl81BNS5W5V5gnw79D+ecI0ylOeuwI0AY9Z12ie s/eH6KNzoEcU8fQ+/1btqSwJAOn2vm+7L0e/xe9A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Julia Lawall , Philipp Zabel , Sasha Levin Subject: [PATCH 4.14 012/183] drm/imx: imx-ldb: add missing of_node_puts Date: Fri, 22 Mar 2019 12:14:00 +0100 Message-Id: <20190322111242.675449996@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190322111241.819468003@linuxfoundation.org> References: <20190322111241.819468003@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore 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 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit aa3312012f103f91f123600bbf768b11c8f431bc ] The device node iterators perform an of_node_get on each iteration, so a jump out of the loop requires an of_node_put. Move the initialization channel->child = child; down to just before the call to imx_ldb_register so that intervening failures don't need to clear it. Add a label at the end of the function to do all the of_node_puts. The semantic patch that finds part of this problem is as follows (http://coccinelle.lip6.fr): // @@ expression root,e; local idexpression child; iterator name for_each_child_of_node; @@ for_each_child_of_node(root, child) { ... when != of_node_put(child) when != e = child ( return child; | * return ...; ) ... } // Signed-off-by: Julia Lawall Signed-off-by: Philipp Zabel Signed-off-by: Sasha Levin --- drivers/gpu/drm/imx/imx-ldb.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c index dd5312b02a8d..4f2e6c7e04c1 100644 --- a/drivers/gpu/drm/imx/imx-ldb.c +++ b/drivers/gpu/drm/imx/imx-ldb.c @@ -652,8 +652,10 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) int bus_format; ret = of_property_read_u32(child, "reg", &i); - if (ret || i < 0 || i > 1) - return -EINVAL; + if (ret || i < 0 || i > 1) { + ret = -EINVAL; + goto free_child; + } if (!of_device_is_available(child)) continue; @@ -666,7 +668,6 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) channel = &imx_ldb->channel[i]; channel->ldb = imx_ldb; channel->chno = i; - channel->child = child; /* * The output port is port@4 with an external 4-port mux or @@ -676,13 +677,13 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) imx_ldb->lvds_mux ? 4 : 2, 0, &channel->panel, &channel->bridge); if (ret && ret != -ENODEV) - return ret; + goto free_child; /* panel ddc only if there is no bridge */ if (!channel->bridge) { ret = imx_ldb_panel_ddc(dev, channel, child); if (ret) - return ret; + goto free_child; } bus_format = of_get_bus_format(dev, child); @@ -698,18 +699,26 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data) if (bus_format < 0) { dev_err(dev, "could not determine data mapping: %d\n", bus_format); - return bus_format; + ret = bus_format; + goto free_child; } channel->bus_format = bus_format; + channel->child = child; ret = imx_ldb_register(drm, channel); - if (ret) - return ret; + if (ret) { + channel->child = NULL; + goto free_child; + } } dev_set_drvdata(dev, imx_ldb); return 0; + +free_child: + of_node_put(child); + return ret; } static void imx_ldb_unbind(struct device *dev, struct device *master, -- 2.19.1