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From:   Nicholas Mc Guire <hofrat@osadl.org>
To:     Russell King <linux@armlinux.org.uk>
Cc:     Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Fabio Estevam <festevam@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Mark Brown <broonie@kernel.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Tony Lindgren <tony@atomide.com>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Janusz Krzysztofik <jmkrzyszt@gmail.com>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Nicholas Mc Guire <hofrat@osadl.org>
Subject: [PATCH] ARM: add missing of_node_put()
Date:   Sat, 13 Apr 2019 09:14:14 +0200
Message-Id: <1555139666-948-3-git-send-email-hofrat@osadl.org>
In-Reply-To: <1555139666-948-1-git-send-email-hofrat@osadl.org>
References: <1555139666-948-1-git-send-email-hofrat@osadl.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

 The call to of_find_compatible_node() returns a node pointer with refcount
incremented thus it must be explicitly decremented here after the last
usage. (see drivers/of/base.c:of_find_compatible_node())

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
---

Problem located with an experimental coccinelle script

Patch was compile tested with: axm55xx_defconfig
(with some sparse warnings - not related to the proposed change though)

Patch is against 4.17.0 (localversion-next is next-20180614)

 arch/arm/mach-axxia/platsmp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-axxia/platsmp.c b/arch/arm/mach-axxia/platsmp.c
index 502e3df..c706a11 100644
--- a/arch/arm/mach-axxia/platsmp.c
+++ b/arch/arm/mach-axxia/platsmp.c
@@ -40,10 +40,11 @@ static int axxia_boot_secondary(unsigned int cpu, struct task_struct *idle)
 	syscon_np = of_find_compatible_node(NULL, NULL, "lsi,axxia-syscon");
 	if (!syscon_np)
 		return -ENOENT;
 
 	syscon = of_iomap(syscon_np, 0);
+	of_node_put(syscon_np);
 	if (!syscon)
 		return -ENOMEM;
 
 	tmp = readl(syscon + SC_RST_CPU_HOLD);
 	writel(0xab, syscon + SC_CRIT_WRITE_KEY);
-- 
2.1.4