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From:   Wen Yang <wen.yang99@zte.com.cn>
To:     liviu.dudau@arm.com
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        Wen Yang <wen.yang99@zte.com.cn>
Subject: [PATCH 07/15] ARM: rockchip: fix a leaked reference by addingmissing of_node_put
Date:   Fri, 1 Mar 2019 16:56:48 +0800
Message-Id: <1551430616-42014-7-git-send-email-wen.yang99@zte.com.cn>
In-Reply-To: <1551430616-42014-1-git-send-email-wen.yang99@zte.com.cn>
References: <1551430616-42014-1-git-send-email-wen.yang99@zte.com.cn>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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-rockchip/pm.c:269:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 259, but without a corresponding object release within this function.
./arch/arm/mach-rockchip/pm.c:275:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 259, but without a corresponding object release within this function
./arch/arm/mach-rockchip/platsmp.c:280:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 271, but without a corresponding object release within this function.
./arch/arm/mach-rockchip/platsmp.c:284:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 271, but without a corresponding object release within this function.
./arch/arm/mach-rockchip/platsmp.c:288:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 271, but without a corresponding object release within this function.
./arch/arm/mach-rockchip/platsmp.c:302:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 293, but without a corresponding object release within this function.
./arch/arm/mach-rockchip/platsmp.c:250:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 241, but without a corresponding object release within this function.
./arch/arm/mach-rockchip/platsmp.c:260:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 241, but without a corresponding object release within this function.
./arch/arm/mach-rockchip/platsmp.c:263:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 241, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-rockchip@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
---
 arch/arm/mach-rockchip/platsmp.c | 12 ++++++++----
 arch/arm/mach-rockchip/pm.c      | 11 ++++++-----
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/arch/arm/mach-rockchip/platsmp.c b/arch/arm/mach-rockchip/platsmp.c
index 51984a4..f93d64e 100644
--- a/arch/arm/mach-rockchip/platsmp.c
+++ b/arch/arm/mach-rockchip/platsmp.c
@@ -277,19 +277,20 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
 	sram_base_addr = of_iomap(node, 0);
 	if (!sram_base_addr) {
 		pr_err("%s: could not map sram registers\n", __func__);
-		return;
+		goto out_put_node;
 	}
 
 	if (has_pmu && rockchip_smp_prepare_pmu())
-		return;
+		goto out_put_node;
 
 	if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
 		if (rockchip_smp_prepare_sram(node))
-			return;
+			goto out_put_node;
 
 		/* enable the SCU power domain */
 		pmu_set_power_domain(PMU_PWRDN_SCU, true);
 
+		of_node_put(node);
 		node = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
 		if (!node) {
 			pr_err("%s: missing scu\n", __func__);
@@ -299,7 +300,7 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
 		scu_base_addr = of_iomap(node, 0);
 		if (!scu_base_addr) {
 			pr_err("%s: could not map scu registers\n", __func__);
-			return;
+			goto out_put_node;
 		}
 
 		/*
@@ -321,6 +322,9 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
 	/* Make sure that all cores except the first are really off */
 	for (i = 1; i < ncores; i++)
 		pmu_set_power_domain(0 + i, false);
+
+out_put_node:
+	of_node_put(node);
 }
 
 static void __init rk3036_smp_prepare_cpus(unsigned int max_cpus)
diff --git a/arch/arm/mach-rockchip/pm.c b/arch/arm/mach-rockchip/pm.c
index 0592534..43a16c9 100644
--- a/arch/arm/mach-rockchip/pm.c
+++ b/arch/arm/mach-rockchip/pm.c
@@ -266,25 +266,26 @@ static int rk3288_suspend_init(struct device_node *np)
 	rk3288_bootram_base = of_iomap(sram_np, 0);
 	if (!rk3288_bootram_base) {
 		pr_err("%s: could not map bootram base\n", __func__);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto out_put_node;
 	}
 
 	ret = of_address_to_resource(sram_np, 0, &res);
 	if (ret) {
 		pr_err("%s: could not get bootram phy addr\n", __func__);
-		return ret;
+		goto out_put_node;
 	}
 	rk3288_bootram_phy = res.start;
 
-	of_node_put(sram_np);
-
 	rk3288_config_bootdata();
 
 	/* copy resume code and data to bootsram */
 	memcpy(rk3288_bootram_base, rockchip_slp_cpu_resume,
 	       rk3288_bootram_sz);
 
-	return 0;
+out_put_node:
+	of_node_put(sram_np);
+	return ret;
 }
 
 static const struct platform_suspend_ops rk3288_suspend_ops = {
-- 
2.9.5