linux-kernel - [PATCH] arm: mach-socfpga: Fix refcount leak bug in socfpga

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Date:   Fri, 17 Jun 2022 20:06:18 +0800
From:   Liang He <windhl@....com>
To:     dinguyen@...nel.org, linux@...linux.org.uk
Cc:     windhl@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] arm: mach-socfpga: Fix refcount leak bug in socfpga

In socfpga_sysmgr_init(), of_find_compatible_node() will return a
node pointer with refcount incremented. We should use of_node_put()
when it is not used anymore.

Signed-off-by: Liang He <windhl@....com>
---
 arch/arm/mach-socfpga/socfpga.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-socfpga/socfpga.c b/arch/arm/mach-socfpga/socfpga.c
index 9e4cb2ffd580..c561b3b7a9ee 100644
--- a/arch/arm/mach-socfpga/socfpga.c
+++ b/arch/arm/mach-socfpga/socfpga.c
@@ -36,12 +36,15 @@ static void __init socfpga_sysmgr_init(void)
 	sync_cache_w(&socfpga_cpu1start_addr);
 
 	sys_manager_base_addr = of_iomap(np, 0);
+	of_node_put(np);
 
 	np = of_find_compatible_node(NULL, NULL, "altr,rst-mgr");
 	rst_manager_base_addr = of_iomap(np, 0);
+	of_node_put(np);
 
 	np = of_find_compatible_node(NULL, NULL, "altr,sdr-ctl");
 	sdr_ctl_base_addr = of_iomap(np, 0);
+	of_node_put(np);
 }
 
 static void __init socfpga_init_irq(void)
-- 
2.25.1