linux-kernel - [PATCH] memory/tegra: Add missing of_node_get() in tegra_emc_find_node_by_ram

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Date:   Wed, 22 Jun 2022 12:28:24 +0800
From:   Liang He <windhl@....com>
To:     krzysztof.kozlowski@...aro.org, thierry.reding@...il.com,
        jonathanh@...dia.com
Cc:     windhl@....com, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: [PATCH] memory/tegra: Add missing of_node_get() in tegra_emc_find_node_by_ram_code

of_find_node_by_name() will decrease the refcount of its first arg and
we need to add a of_node_put() to keep refcount balance.

Besides, during the 'for' loop execution, the refcount of 'np' will be
automatically increased and decreased. There is no need to call
of_node_put() again.

Signed-off-by: Liang He <windhl@....com>
---
 drivers/memory/tegra/tegra20-emc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c
index 25ba3c5e4ad6..e43a5f8e188e 100644
--- a/drivers/memory/tegra/tegra20-emc.c
+++ b/drivers/memory/tegra/tegra20-emc.c
@@ -477,6 +477,7 @@ tegra_emc_find_node_by_ram_code(struct tegra_emc *emc)
 
 	ram_code = tegra_read_ram_code();
 
+	of_get_node(dev->of_node);
 	for (np = of_find_node_by_name(dev->of_node, "emc-tables"); np;
 	     np = of_find_node_by_name(np, "emc-tables")) {
 		err = of_property_read_u32(np, "nvidia,ram-code", &value);
@@ -484,6 +485,7 @@ tegra_emc_find_node_by_ram_code(struct tegra_emc *emc)
 			struct device_node *lpddr2_np;
 			bool cfg_mismatches = false;
 
+			of_node_get(np);
 			lpddr2_np = of_find_node_by_name(np, "lpddr2");
 			if (lpddr2_np) {
 				const struct lpddr2_info *info;
@@ -521,7 +523,6 @@ tegra_emc_find_node_by_ram_code(struct tegra_emc *emc)
 			}
 
 			if (cfg_mismatches) {
-				of_node_put(np);
 				continue;
 			}
 		}
-- 
2.25.1