From patchwork Sun May 31 20:41:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Drew Fustini X-Patchwork-Id: 211358 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=-6.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS 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 0B680C433E2 for ; Sun, 31 May 2020 20:41:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DA32E206E2 for ; Sun, 31 May 2020 20:41:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=beagleboard-org.20150623.gappssmtp.com header.i=@beagleboard-org.20150623.gappssmtp.com header.b="AbeDd+VZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728296AbgEaUlw (ORCPT ); Sun, 31 May 2020 16:41:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35900 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727000AbgEaUlw (ORCPT ); Sun, 31 May 2020 16:41:52 -0400 Received: from mail-wr1-x441.google.com (mail-wr1-x441.google.com [IPv6:2a00:1450:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E70FC05BD43 for ; Sun, 31 May 2020 13:41:51 -0700 (PDT) Received: by mail-wr1-x441.google.com with SMTP id l10so9439006wrr.10 for ; Sun, 31 May 2020 13:41:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=beagleboard-org.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:mime-version:content-disposition; bh=XPS7Wm2VWj6CUy+E0xjT/Rc+9g5GOp3P8FCBLIlwzJo=; b=AbeDd+VZXi3HG/DUD5MnzM0WkfA7pfoopzNQnkqPJVYXiC1x3Ge0puDCadq3xmZCOf sClqPFc5prhw5ggSaHNlWPUwwh7wF8oQVsS6z33KhK7luIW9/bhu7CZJ1TJTiCmc3adX H122u4+Vs6Mf4dH85DDPnxJi/K7hNSt8y6a23n83KKGDsNzbzgHX96UvwDATLCP/Qb7i kobyDYvnWucSKMSSZBg5kQFe1EjmWMdnoSjyW6hmfzMgPVhlo+15ogtdOu1Wf0APGegV egKw/l2UAp5uoBy3oBg+7Qqy9WQVfADYAGig/32FdrOKd+hn3SI9Z67KR+2yhWZwKsE/ //EA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:mime-version :content-disposition; bh=XPS7Wm2VWj6CUy+E0xjT/Rc+9g5GOp3P8FCBLIlwzJo=; b=GAOl3LjkQ2HjGjYgtUtsnH8MM6pIBY+zMpWvAAEafpsQ6J3vO1qIN6Gw3Mu27AOvxp i7pENWx4weZG8K7PUeayBjNy/zUjkhtaMT4aCwEwTqwwzN79BHA2JZSF4tYFknFIcZCa Oqu3M/ZTJStIx1poEpzok2QDHJP7uCrYJSZXH64sHkMW8ajJNU4RYU3aYT/KWc/nBt6K 7vvktkKMi9OzVHx4AZ32J5t3KV8l39QSU2nlcsdkVA55hwZonE/tcfFtJns15rzqT0Ir eeEfW2dbKpjgkI6soStdmVWSbXkG4F1eZrAGhLUb31vIqP82CDjkhUd/3mJtuFn9OKox RLjw== X-Gm-Message-State: AOAM5325FgBEXwN0APzaNDvqIp4r/bdcXZAvjEsBrhodSZR2pHeq3Gnu ReO9H6rBhKV9oXOH2puv1WODfg== X-Google-Smtp-Source: ABdhPJx15g0vSZpLKQ1DQXGPeEz1sugYXvSvoWG4pgj2qP0JKlhM0zDTy5DuHXhyIA72bnpCctTB0w== X-Received: by 2002:adf:e44c:: with SMTP id t12mr18025369wrm.181.1590957710498; Sun, 31 May 2020 13:41:50 -0700 (PDT) Received: from x1 ([2001:16b8:5c3c:c701:98fe:8f8:cce1:59e]) by smtp.gmail.com with ESMTPSA id z206sm9940414wmg.30.2020.05.31.13.41.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 31 May 2020 13:41:49 -0700 (PDT) Date: Sun, 31 May 2020 22:41:47 +0200 From: Drew Fustini To: Tony Lindgren , Haojian Zhuang , Linus Walleij , linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jason Kridner , Robert Nelson Subject: [PATCH] pinctrl-single: fix pcs_parse_pinconf() return val Message-ID: <20200531204147.GA664833@x1> MIME-Version: 1.0 Content-Disposition: inline Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org This patch causes pcs_parse_pinconf() to return an error when no pinctrl_map is added. The current behavior is to return 0 when !PCS_HAS_PINCONF or !nconfs. Thus pcs_parse_one_pinctrl_entry() incorrectly assumes that a map was added and sets num_maps = 2. Analysis: ========= The function pcs_parse_one_pinctrl_entry() calls pcs_parse_pinconf() if PCS_HAS_PINCONF is enabled. The function pcs_parse_pinconf() returns 0 to indicate there was no error and num_maps is then set to 2: 980 static int pcs_parse_one_pinctrl_entry(struct pcs_device *pcs, 981 struct device_node *np, 982 struct pinctrl_map **map, 983 unsigned *num_maps, 984 const char **pgnames) 985 { 1053 (*map)->type = PIN_MAP_TYPE_MUX_GROUP; 1054 (*map)->data.mux.group = np->name; 1055 (*map)->data.mux.function = np->name; 1056 1057 if (PCS_HAS_PINCONF && function) { 1058 res = pcs_parse_pinconf(pcs, np, function, map); 1059 if (res) 1060 goto free_pingroups; 1061 *num_maps = 2; 1062 } else { 1063 *num_maps = 1; 1064 } However, pcs_parse_pinconf() will also return 0 if !PCS_HAS_PINCONF or !nconfs. I believe these conditions should indicate that no map was added by returning non-zero. Otherwise pcs_parse_one_pinctrl_entry() will set num_maps = 2 even though no maps were successfully added, as it does not reach "m++" on line 940: 895 static int pcs_parse_pinconf(struct pcs_device *pcs, struct device_node *np, 896 struct pcs_function *func, 897 struct pinctrl_map **map) 898 899 { 900 struct pinctrl_map *m = *map; 917 /* If pinconf isn't supported, don't parse properties in below. */ 918 if (!PCS_HAS_PINCONF) 919 return 0; 920 921 /* cacluate how much properties are supported in current node */ 922 for (i = 0; i < ARRAY_SIZE(prop2); i++) { 923 if (of_find_property(np, prop2[i].name, NULL)) 924 nconfs++; 925 } 926 for (i = 0; i < ARRAY_SIZE(prop4); i++) { 927 if (of_find_property(np, prop4[i].name, NULL)) 928 nconfs++; 929 } 930 if (!nconfs) 919 return 0; 932 933 func->conf = devm_kcalloc(pcs->dev, 934 nconfs, sizeof(struct pcs_conf_vals), 935 GFP_KERNEL); 936 if (!func->conf) 937 return -ENOMEM; 938 func->nconfs = nconfs; 939 conf = &(func->conf[0]); 940 m++; This situtation will cause a boot failure [0] on the BeagleBone Black (AM3358) when am33xx_pinmux node in arch/arm/boot/dts/am33xx-l4.dtsi has compatible = "pinconf-single" instead of "pinctrl-single". The patch fixes this issue by returning -ENOSUPP when !PCS_HAS_PINCONF or !nconfs, so that pcs_parse_one_pinctrl_entry() will know that no map was added. [0] https://lore.kernel.org/linux-omap/20200529175544.GA3766151@x1/ Signed-off-by: Drew Fustini --- drivers/pinctrl/pinctrl-single.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c index 1e0614daee9b..18a02cd0c701 100644 --- a/drivers/pinctrl/pinctrl-single.c +++ b/drivers/pinctrl/pinctrl-single.c @@ -916,7 +916,7 @@ static int pcs_parse_pinconf(struct pcs_device *pcs, struct device_node *np, /* If pinconf isn't supported, don't parse properties in below. */ if (!PCS_HAS_PINCONF) - return 0; + return -ENOTSUPP; /* do not return 0 as no map added */ /* cacluate how much properties are supported in current node */ for (i = 0; i < ARRAY_SIZE(prop2); i++) { @@ -928,7 +928,7 @@ static int pcs_parse_pinconf(struct pcs_device *pcs, struct device_node *np, nconfs++; } if (!nconfs) - return 0; + return -ENOTSUPP; /* do not return 0 as no map added */ func->conf = devm_kcalloc(pcs->dev, nconfs, sizeof(struct pcs_conf_vals),