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
next reply other threads:[~2020-11-27 9:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-27 9:44 Qinglang Miao [this message]
2020-11-30 16:44 ` [PATCH] gpio: zynq: fix reference leak in zynq_gpio functions Bartosz Golaszewski
2020-12-01 1:23 ` Qinglang Miao
2020-12-02 9:45 ` Bartosz Golaszewski
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201127094445.121232-1-miaoqinglang@huawei.com \
--to=miaoqinglang@huawei.com \
--cc=bgolaszewski@baylibre.com \
--cc=linus.walleij@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-gpio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=michal.simek@xilinx.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).