linux-kernel - [PATCH] ARM: mstar: Fix refcount leaks

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Message-Id: <20220512034652.61134-1-linmq006@gmail.com>
Date:   Thu, 12 May 2022 07:46:51 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Daniel Palmer <daniel@...ngy.jp>,
        Romain Perier <romain.perier@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] ARM: mstar: Fix refcount leaks

of_find_compatible_node() returns a node pointer with refcount
incremented, we should use of_node_put() on it when done.
Add missing of_node_put() to avoid refcount leak.

Fixes: 5919eec0f092 ("ARM: mstar: SMP support")
Fixes: 312b62b6610c ("ARM: mstar: Add machine for MStar/Sigmastar Armv7 SoCs")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 arch/arm/mach-mstar/mstarv7.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/mach-mstar/mstarv7.c b/arch/arm/mach-mstar/mstarv7.c
index 274c4f0df270..3176998817d2 100644
--- a/arch/arm/mach-mstar/mstarv7.c
+++ b/arch/arm/mach-mstar/mstarv7.c
@@ -86,6 +86,7 @@ static int mstarv7_boot_secondary(unsigned int cpu, struct task_struct *idle)
 
 	np = of_find_compatible_node(NULL, NULL, "mstar,smpctrl");
 	smpctrl = of_iomap(np, 0);
+	of_node_put(np);
 
 	if (!smpctrl)
 		return -ENODEV;
@@ -120,6 +121,7 @@ static void __init mstarv7_init(void)
 		soc_mb = mstarv7_mb;
 	else
 		pr_warn("Failed to install memory barrier, DMA will be broken!\n");
+	of_node_put(np);
 }
 
 DT_MACHINE_START(MSTARV7_DT, "MStar/Sigmastar Armv7 (Device Tree)")
-- 
2.25.1