linux-kernel - [PATCH] ARM: add missing of_node

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Date:   Fri, 15 Jun 2018 14:28:08 +0200
From:   Nicholas Mc Guire <hofrat@...dl.org>
To:     Anders Berg <anders.berg@....com>
Cc:     Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH] ARM: add missing of_node_put()

 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@...dl.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