[PATCH 4/4] ARM: sunxi: fix a leaked reference by adding missing of_node_put

[Wen Yang]

The call to of_get_next_child returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
./arch/arm/mach-sunxi/mc_smp.c:110:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 97, but without a corresponding object release within this functio
./arch/arm/mach-sunxi/platsmp.c:138:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 129, but without a corresponding object release within this function

Signed-off-by: Wen Yang <wen.yang99@xxxxxxxxxx>
Cc: Maxime Ripard <maxime.ripard@xxxxxxxxxxx>
Cc: Chen-Yu Tsai <wens@xxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx (open list)
---
 arch/arm/mach-sunxi/mc_smp.c  | 5 ++++-
 arch/arm/mach-sunxi/platsmp.c | 2 ++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-sunxi/mc_smp.c b/arch/arm/mach-sunxi/mc_smp.c
index b4037b6..239084c 100644
--- a/arch/arm/mach-sunxi/mc_smp.c
+++ b/arch/arm/mach-sunxi/mc_smp.c
@@ -89,6 +89,7 @@ static bool sunxi_core_is_cortex_a15(unsigned int core, unsigned int cluster)
 {
 	struct device_node *node;
 	int cpu = cluster * SUNXI_CPUS_PER_CLUSTER + core;
+	bool is_compatible;
 
 	node = of_cpu_device_node_get(cpu);
 
@@ -107,7 +108,9 @@ static bool sunxi_core_is_cortex_a15(unsigned int core, unsigned int cluster)
 		return false;
 	}
 
-	return of_device_is_compatible(node, "arm,cortex-a15");
+	is_compatible = of_device_is_compatible(node, "arm,cortex-a15");
+	of_node_put(node);
+	return is_compatible;
 }
 
 static int sunxi_cpu_power_switch_set(unsigned int cpu, unsigned int cluster,
diff --git a/arch/arm/mach-sunxi/platsmp.c b/arch/arm/mach-sunxi/platsmp.c
index c842209..bdde9ef 100644
--- a/arch/arm/mach-sunxi/platsmp.c
+++ b/arch/arm/mach-sunxi/platsmp.c
@@ -135,6 +135,7 @@ static void __init sun8i_smp_prepare_cpus(unsigned int max_cpus)
 	}
 
 	prcm_membase = of_iomap(node, 0);
+	of_node_put(node);
 	if (!prcm_membase) {
 		pr_err("Couldn't map A23 PRCM registers\n");
 		return;
@@ -148,6 +149,7 @@ static void __init sun8i_smp_prepare_cpus(unsigned int max_cpus)
 	}
 
 	cpucfg_membase = of_iomap(node, 0);
+	of_node_put(node);
 	if (!cpucfg_membase)
 		pr_err("Couldn't map A23 CPU config registers\n");
 
-- 
2.9.5