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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,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 213FEC76191 for ; Mon, 15 Jul 2019 14:13:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EE049212F5 for ; Mon, 15 Jul 2019 14:13:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563200011; bh=hmiW3UkNL87MzxfzpVhbPNhWNuSCqEVc9R8JSmPMPpQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Q7sjCMeUDpwgvhGLsE40wTuCeQuOxeEnuivT2OpEJzWESZ+xyerTZ2iy16qs0usT0 EZSJ8YvU6kySnjlfUvvG/KDGXZxQxvich+G3zSqkqJwpS7DZjRYux/PYEMVw1tJWuz joihO5CO8OwPcP2mGS7Z+o4I7KlT7nd5jn7eFNtA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388893AbfGOONa (ORCPT ); Mon, 15 Jul 2019 10:13:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:54124 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388771AbfGOON3 (ORCPT ); Mon, 15 Jul 2019 10:13:29 -0400 Received: from sasha-vm.mshome.net (unknown [73.61.17.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id EDE4E2083D; Mon, 15 Jul 2019 14:13:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563200008; bh=hmiW3UkNL87MzxfzpVhbPNhWNuSCqEVc9R8JSmPMPpQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1wAu4Ma0az9fRgtM5aCKQulScX3As7frA/09MteARlSCkoSbxZm7p/KJgRTmQv2QB 3o6dzP5NpVnYeWfC8M9G8LFIPWAPLngwOyW2sOZ+7rFqs9tUgXdvSgmEsIjl1G0Q0H isNVRNyDjycipfpr9B97yCFtfzgpBhPMlwJ5STOA= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Waibel Georg , Georg Waibel , Krzysztof Kozlowski , Linus Walleij , Mark Brown , Sasha Levin , linux-gpio@vger.kernel.org, linux-samsung-soc@vger.kernel.org Subject: [PATCH AUTOSEL 5.1 158/219] gpio: Fix return value mismatch of function gpiod_get_from_of_node() Date: Mon, 15 Jul 2019 10:02:39 -0400 Message-Id: <20190715140341.6443-158-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190715140341.6443-1-sashal@kernel.org> References: <20190715140341.6443-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org From: Waibel Georg [ Upstream commit 025bf37725f1929542361eef2245df30badf242e ] In case the requested gpio property is not found in the device tree, some callers of gpiod_get_from_of_node() expect a return value of NULL, others expect -ENOENT. In particular devm_fwnode_get_index_gpiod_from_child() expects -ENOENT. Currently it gets a NULL, which breaks the loop that tries all gpio_suffixes. The result is that a gpio property is not found, even though it is there. This patch changes gpiod_get_from_of_node() to return -ENOENT instead of NULL when the requested gpio property is not found in the device tree. Additionally it modifies all calling functions to properly evaluate the return value. Another approach would be to leave the return value of gpiod_get_from_of_node() as is and fix the bug in devm_fwnode_get_index_gpiod_from_child(). Other callers would still need to be reworked. The effort would be the same as with the chosen solution. Signed-off-by: Georg Waibel Reviewed-by: Krzysztof Kozlowski Reviewed-by: Linus Walleij Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/gpio/gpiolib.c | 6 +----- drivers/regulator/da9211-regulator.c | 2 ++ drivers/regulator/s2mps11.c | 4 +++- drivers/regulator/s5m8767.c | 4 +++- drivers/regulator/tps65090-regulator.c | 7 ++++--- 5 files changed, 13 insertions(+), 10 deletions(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index bca3e7740ef6..fd1344056e1d 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -4232,8 +4232,7 @@ EXPORT_SYMBOL_GPL(gpiod_get_index); * * Returns: * On successful request the GPIO pin is configured in accordance with - * provided @dflags. If the node does not have the requested GPIO - * property, NULL is returned. + * provided @dflags. * * In case of error an ERR_PTR() is returned. */ @@ -4255,9 +4254,6 @@ struct gpio_desc *gpiod_get_from_of_node(struct device_node *node, index, &flags); if (!desc || IS_ERR(desc)) { - /* If it is not there, just return NULL */ - if (PTR_ERR(desc) == -ENOENT) - return NULL; return desc; } diff --git a/drivers/regulator/da9211-regulator.c b/drivers/regulator/da9211-regulator.c index 4d7fe4819c1c..4e95e3d0fcd5 100644 --- a/drivers/regulator/da9211-regulator.c +++ b/drivers/regulator/da9211-regulator.c @@ -299,6 +299,8 @@ static struct da9211_pdata *da9211_parse_regulators_dt( 0, GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_NONEXCLUSIVE, "da9211-enable"); + if (IS_ERR(pdata->gpiod_ren[n])) + pdata->gpiod_ren[n] = NULL; n++; } diff --git a/drivers/regulator/s2mps11.c b/drivers/regulator/s2mps11.c index 134c62db36c5..b518a81f75a3 100644 --- a/drivers/regulator/s2mps11.c +++ b/drivers/regulator/s2mps11.c @@ -821,7 +821,9 @@ static void s2mps14_pmic_dt_parse_ext_control_gpio(struct platform_device *pdev, 0, GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_NONEXCLUSIVE, "s2mps11-regulator"); - if (IS_ERR(gpio[reg])) { + if (PTR_ERR(gpio[reg]) == -ENOENT) + gpio[reg] = NULL; + else if (IS_ERR(gpio[reg])) { dev_err(&pdev->dev, "Failed to get control GPIO for %d/%s\n", reg, rdata[reg].name); continue; diff --git a/drivers/regulator/s5m8767.c b/drivers/regulator/s5m8767.c index bb9d1a083299..6ca27e9d5ef7 100644 --- a/drivers/regulator/s5m8767.c +++ b/drivers/regulator/s5m8767.c @@ -574,7 +574,9 @@ static int s5m8767_pmic_dt_parse_pdata(struct platform_device *pdev, 0, GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_NONEXCLUSIVE, "s5m8767"); - if (IS_ERR(rdata->ext_control_gpiod)) + if (PTR_ERR(rdata->ext_control_gpiod) == -ENOENT) + rdata->ext_control_gpiod = NULL; + else if (IS_ERR(rdata->ext_control_gpiod)) return PTR_ERR(rdata->ext_control_gpiod); rdata->id = i; diff --git a/drivers/regulator/tps65090-regulator.c b/drivers/regulator/tps65090-regulator.c index 0614551796a1..f6466db57900 100644 --- a/drivers/regulator/tps65090-regulator.c +++ b/drivers/regulator/tps65090-regulator.c @@ -381,11 +381,12 @@ static struct tps65090_platform_data *tps65090_parse_dt_reg_data( "dcdc-ext-control-gpios", 0, gflags, "tps65090"); - if (IS_ERR(rpdata->gpiod)) - return ERR_CAST(rpdata->gpiod); - if (!rpdata->gpiod) + if (PTR_ERR(rpdata->gpiod) == -ENOENT) { dev_err(&pdev->dev, "could not find DCDC external control GPIO\n"); + rpdata->gpiod = NULL; + } else if (IS_ERR(rpdata->gpiod)) + return ERR_CAST(rpdata->gpiod); } if (of_property_read_u32(tps65090_matches[idx].of_node, -- 2.20.1