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gpio: zynq: fix reference leak in zynq_gpio functions 

[ Upstream commit 7f57b295f9 ]

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] dd8088d5a8 ("PM: runtime: Add  pm_runtime_resume_and_get to deal with usage counter")

Fixes: c2df3de0d0 ("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>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Qinglang Miao 2020-11-27 17:44:45 +08:00 committed by Greg Kroah-Hartman
parent 823f42bd61
commit ec64dea576
1 changed files with 2 additions and 2 deletions
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4
drivers/gpio/gpio-zynq.c
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@ -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;