linux-kernel - [PATCH v2] pinctrl: rockchip: fix leaked of

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Message-Id: <1555309442-16039-1-git-send-email-wen.yang99@zte.com.cn>
Date:   Mon, 15 Apr 2019 14:24:02 +0800
From:   Wen Yang <wen.yang99@....com.cn>
To:     linux-kernel@...r.kernel.org
Cc:     wang.yi59@....com.cn, Wen Yang <wen.yang99@....com.cn>,
        Linus Walleij <linus.walleij@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>, linux-gpio@...r.kernel.org,
        linux-rockchip@...ts.infradead.org
Subject: [PATCH v2] pinctrl: rockchip: fix leaked of_node references

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

Detected by coccinelle with the following warnings:
./drivers/pinctrl/pinctrl-rockchip.c:3221:2-8: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 3196, but without a corresponding object release within this function.
./drivers/pinctrl/pinctrl-rockchip.c:3223:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 3196, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@....com.cn>
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Heiko Stuebner <heiko@...ech.de>
Cc: linux-gpio@...r.kernel.org
Cc: linux-rockchip@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
v2: 
 - put of_node_put below the whole if clause.
 - In the if clause, since node is NULL, there is no need to call of_node_put before return.

 drivers/pinctrl/pinctrl-rockchip.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 16bf21b..6436336 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -3212,6 +3212,7 @@ static int rockchip_get_bank_data(struct rockchip_pin_bank *bank,
 						    base,
 						    &rockchip_regmap_config);
 		}
+		of_node_put(node);
 	}

 	bank->irq = irq_of_parse_and_map(bank->of_node, 0);
-- 
2.9.5