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From: Qinglang Miao <miaoqinglang@huawei.com>
To: Linus Walleij <linus.walleij@linaro.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Michal Simek <michal.simek@xilinx.com>
Cc: <linux-gpio@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>,
	Qinglang Miao <miaoqinglang@huawei.com>
Subject: [PATCH] gpio: zynq: fix reference leak in zynq_gpio functions
Date: Fri, 27 Nov 2020 17:44:45 +0800	[thread overview]
Message-ID: <20201127094445.121232-1-miaoqinglang@huawei.com> (raw)

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@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
---
 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 0b5a17ab9..3521c1dc3 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -574,7 +574,7 @@ 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;
 
@@ -942,7 +942,7 @@ 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;
 
-- 
2.23.0


WARNING: multiple messages have this Message-ID (diff)
From: Qinglang Miao <miaoqinglang@huawei.com>
To: Linus Walleij <linus.walleij@linaro.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Michal Simek <michal.simek@xilinx.com>
Cc: linux-gpio@vger.kernel.org,
	Qinglang Miao <miaoqinglang@huawei.com>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH] gpio: zynq: fix reference leak in zynq_gpio functions
Date: Fri, 27 Nov 2020 17:44:45 +0800	[thread overview]
Message-ID: <20201127094445.121232-1-miaoqinglang@huawei.com> (raw)

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@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
---
 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 0b5a17ab9..3521c1dc3 100644
--- a/drivers/gpio/gpio-zynq.c
+++ b/drivers/gpio/gpio-zynq.c
@@ -574,7 +574,7 @@ 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;
 
@@ -942,7 +942,7 @@ 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;
 
-- 
2.23.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2020-11-27  9:41 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-27  9:44 Qinglang Miao [this message]
2020-11-27  9:44 ` [PATCH] gpio: zynq: fix reference leak in zynq_gpio functions Qinglang Miao
2020-11-30 16:44 ` Bartosz Golaszewski
2020-11-30 16:44   ` Bartosz Golaszewski
2020-12-01  1:23   ` Qinglang Miao
2020-12-01  1:23     ` Qinglang Miao
2020-12-02  9:45 ` Bartosz Golaszewski
2020-12-02  9:45   ` Bartosz Golaszewski

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