From patchwork Fri Jun 17 10:50:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liang He X-Patchwork-Id: 1644803 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=126.com header.i=@126.com header.a=rsa-sha256 header.s=s110527 header.b=kHjwl+p3; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by bilbo.ozlabs.org (Postfix) with ESMTPS id 4LPbVf4092z9s5V for ; Fri, 17 Jun 2022 20:53:14 +1000 (AEST) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4LPbVd6ZJQz3c85 for ; Fri, 17 Jun 2022 20:53:13 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=126.com header.i=@126.com header.a=rsa-sha256 header.s=s110527 header.b=kHjwl+p3; dkim-atps=neutral X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=126.com (client-ip=220.181.15.112; helo=m15112.mail.126.com; envelope-from=windhl@126.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=126.com header.i=@126.com header.a=rsa-sha256 header.s=s110527 header.b=kHjwl+p3; dkim-atps=neutral Received: from m15112.mail.126.com (m15112.mail.126.com [220.181.15.112]) by lists.ozlabs.org (Postfix) with ESMTP id 4LPbVN1RvXz3bpH for ; Fri, 17 Jun 2022 20:52:59 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=126.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=TBVpT Xi3mOGroTRFtYnS2jF3N9afbBUgGy+vsR5qfSA=; b=kHjwl+p3FRM3LWROajx8p B3PCa9VMs4dEAt1MfUAIk1mN/6SLkv9dENRbifemO3CLOt34K9jVC9iwr9QS2u2c 4DchzsaXwMOltmFCcbUrsobZLdsZk2d1Q/Eng4nfXYujRazUFo8TbNHTyn3KOhU3 vaW4RQ7P4JmwVU2242zu50= Received: from localhost.localdomain (unknown [124.16.139.61]) by smtp2 (Coremail) with SMTP id DMmowAA3oPxkXKxipQEODg--.20553S2; Fri, 17 Jun 2022 18:50:12 +0800 (CST) From: Liang He To: mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, christophe.leroy@csgroup.eu, nixiaoming@huawei.com Subject: [PATCH v5] powerpc:85xx: Add missing of_node_put() in sgy_cst1000 Date: Fri, 17 Jun 2022 18:50:11 +0800 Message-Id: <20220617105011.4041123-1-windhl@126.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: DMmowAA3oPxkXKxipQEODg--.20553S2 X-Coremail-Antispam: 1Uf129KBjvJXoWxZFWDtF4DCFW5Jw4fKw18AFb_yoW5uw17pF Z8CrZakrWkGw1xGas3tayDuFy2yw18t3yxJ34fGan7C34UX34qqry0yFyrWrnIgrW8C3yr Jr1aya40kFZrAaDanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0zR-J5cUUUUU= X-Originating-IP: [124.16.139.61] X-CM-SenderInfo: hzlqvxbo6rjloofrz/1tbi7QUjF1pEAN95NwAAsT X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, windhl@126.com, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" In gpio_halt_probe(), of_find_matching_node() will return a node pointer with refcount incremented. We should use of_node_put() in fail path or when it is not used anymore. Signed-off-by: Liang He --- changelog: v5: fix 'gotot' error introduced by v4 and use cross-compiler to test v4: reuse exist 'err' and use a simple code style, advised by CJ v3: use local 'child_node' advised by Michael. v2: use goto-label patch style advised by Christophe Leroy. v1: add of_node_put() before each exit. arch/powerpc/platforms/85xx/sgy_cts1000.c | 35 ++++++++++++++--------- 1 file changed, 22 insertions(+), 13 deletions(-) diff --git a/arch/powerpc/platforms/85xx/sgy_cts1000.c b/arch/powerpc/platforms/85xx/sgy_cts1000.c index 98ae64075193..e14d1b74d4e4 100644 --- a/arch/powerpc/platforms/85xx/sgy_cts1000.c +++ b/arch/powerpc/platforms/85xx/sgy_cts1000.c @@ -71,6 +71,7 @@ static int gpio_halt_probe(struct platform_device *pdev) { enum of_gpio_flags flags; struct device_node *node = pdev->dev.of_node; + struct device_node *child_node; int gpio, err, irq; int trigger; @@ -78,26 +79,29 @@ static int gpio_halt_probe(struct platform_device *pdev) return -ENODEV; /* If there's no matching child, this isn't really an error */ - halt_node = of_find_matching_node(node, child_match); - if (!halt_node) + child_node = of_find_matching_node(node, child_match); + if (!child_node) return 0; /* Technically we could just read the first one, but punish * DT writers for invalid form. */ - if (of_gpio_count(halt_node) != 1) - return -EINVAL; + if (of_gpio_count(child_node) != 1) { + err = -EINVAL; + goto err_put; + } /* Get the gpio number relative to the dynamic base. */ - gpio = of_get_gpio_flags(halt_node, 0, &flags); - if (!gpio_is_valid(gpio)) - return -EINVAL; + gpio = of_get_gpio_flags(child_node, 0, &flags); + if (!gpio_is_valid(gpio)) { + err = -EINVAL; + goto err_put; + } err = gpio_request(gpio, "gpio-halt"); if (err) { printk(KERN_ERR "gpio-halt: error requesting GPIO %d.\n", gpio); - halt_node = NULL; - return err; + goto err_put; } trigger = (flags == OF_GPIO_ACTIVE_LOW); @@ -105,15 +109,14 @@ static int gpio_halt_probe(struct platform_device *pdev) gpio_direction_output(gpio, !trigger); /* Now get the IRQ which tells us when the power button is hit */ - irq = irq_of_parse_and_map(halt_node, 0); + irq = irq_of_parse_and_map(child_node, 0); err = request_irq(irq, gpio_halt_irq, IRQF_TRIGGER_RISING | - IRQF_TRIGGER_FALLING, "gpio-halt", halt_node); + IRQF_TRIGGER_FALLING, "gpio-halt", child_node); if (err) { printk(KERN_ERR "gpio-halt: error requesting IRQ %d for " "GPIO %d.\n", irq, gpio); gpio_free(gpio); - halt_node = NULL; - return err; + goto err_put; } /* Register our halt function */ @@ -123,7 +126,12 @@ static int gpio_halt_probe(struct platform_device *pdev) printk(KERN_INFO "gpio-halt: registered GPIO %d (%d trigger, %d" " irq).\n", gpio, trigger, irq); + halt_node = child_node; return 0; + +err_put: + of_node_put(child_node); + return err; } static int gpio_halt_remove(struct platform_device *pdev) @@ -139,6 +147,7 @@ static int gpio_halt_remove(struct platform_device *pdev) gpio_free(gpio); + of_node_put(halt_node); halt_node = NULL; }