linux-kernel - [PATCH AUTOSEL 5.4 288/330] gpio: rcar: Fix runtime PM imbalance on error

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Message-Id: <20200918020110.2063155-288-sashal@kernel.org>
Date:   Thu, 17 Sep 2020 22:00:28 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dinghao Liu <dinghao.liu@....edu.cn>,
        Linus Walleij <linus.walleij@...aro.org>,
        Sasha Levin <sashal@...nel.org>, linux-gpio@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 288/330] gpio: rcar: Fix runtime PM imbalance on error

From: Dinghao Liu <dinghao.liu@....edu.cn>

[ Upstream commit 6f8cd246411575703d9312888b70705c396b53a9 ]

pm_runtime_get_sync() increments the runtime PM usage counter even
when it returns an error code. Thus a pairing decrement is needed on
the error handling path to keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
Link: https://lore.kernel.org/r/20200522080839.32612-1-dinghao.liu@zju.edu.cn
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpio/gpio-rcar.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index 187984d26f47a..f0b6c68e848e3 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -250,8 +250,10 @@ static int gpio_rcar_request(struct gpio_chip *chip, unsigned offset)
 	int error;
 
 	error = pm_runtime_get_sync(p->dev);
-	if (error < 0)
+	if (error < 0) {
+		pm_runtime_put(p->dev);
 		return error;
+	}
 
 	error = pinctrl_gpio_request(chip->base + offset);
 	if (error)
-- 
2.25.1