linux-kernel - [PATCH 5.4 011/453] gpio: zynq: fix reference leak in zynq

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Message-Id: <20201228124937.788163322@linuxfoundation.org>
Date:   Mon, 28 Dec 2020 13:44:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Qinglang Miao <miaoqinglang@...wei.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 011/453] gpio: zynq: fix reference leak in zynq_gpio functions

From: Qinglang Miao <miaoqinglang@...wei.com>

[ Upstream commit 7f57b295f990c0fa07f96d51ca1c82c52dbf79cc ]

pm_runtime_get_sync will increment pm usage counter even it
failed. Forgetting to putting operation will result in a
reference leak here.

A new function pm_runtime_resume_and_get is introduced in
[0] to keep usage counter balanced. So We fix the reference
leak by replacing it with new funtion.

[0] dd8088d5a896 ("PM: runtime: Add  pm_runtime_resume_and_get to deal with usage counter")

Fixes: c2df3de0d07e ("gpio: zynq: properly support runtime PM for GPIO used as interrupts")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpio/gpio-zynq.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-zynq.c b/drivers/gpio/gpio-zynq.c
index 7835aad6d1628..88b04d8a7fa7d 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -556,7 +556,7 @@ static int zynq_gpio_irq_reqres(struct irq_data *d)
 	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
 	int ret;
 
-	ret = pm_runtime_get_sync(chip->parent);
+	ret = pm_runtime_resume_and_get(chip->parent);
 	if (ret < 0)
 		return ret;
 
@@ -884,7 +884,7 @@ static int zynq_gpio_probe(struct platform_device *pdev)
 
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
-	ret = pm_runtime_get_sync(&pdev->dev);
+	ret = pm_runtime_resume_and_get(&pdev->dev);
 	if (ret < 0)
 		goto err_pm_dis;
 
-- 
2.27.0