linux-kernel - [PATCH] gpio: tpmx86: fix uninitialized variable girq

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Message-Id: <20220914051842.69776-1-dzm91@hust.edu.cn>
Date:   Wed, 14 Sep 2022 13:18:42 +0800
From:   Dongliang Mu <dzm91@...t.edu.cn>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Marc Zyngier <maz@...nel.org>
Cc:     Dongliang Mu <mudongliangabcd@...il.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] gpio: tpmx86: fix uninitialized variable girq

From: Dongliang Mu <mudongliangabcd@...il.com>

The commit 924610607f19 ("gpio: tpmx86: Move PM device over to
irq domain") adds a dereference of girq that may be uninitialized.

Fix this by initializing girq and checking irq before invoking
irq_domain_set_pm_device.

Fixes: 924610607f19 ("gpio: tpmx86: Move PM device over to irq domain")
Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
---
 drivers/gpio/gpio-tqmx86.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-tqmx86.c b/drivers/gpio/gpio-tqmx86.c
index fa4bc7481f9a..bdef182c11c2 100644
--- a/drivers/gpio/gpio-tqmx86.c
+++ b/drivers/gpio/gpio-tqmx86.c
@@ -231,7 +231,7 @@ static int tqmx86_gpio_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct tqmx86_gpio_data *gpio;
 	struct gpio_chip *chip;
-	struct gpio_irq_chip *girq;
+	struct gpio_irq_chip *girq = NULL;
 	void __iomem *io_base;
 	struct resource *res;
 	int ret, irq;
@@ -315,7 +315,9 @@ static int tqmx86_gpio_probe(struct platform_device *pdev)
 		goto out_pm_dis;
 	}
 
-	irq_domain_set_pm_device(girq->domain, dev);
+	if (girq) {
+		irq_domain_set_pm_device(girq->domain, dev);
+	}
 
 	dev_info(dev, "GPIO functionality initialized with %d pins\n",
 		 chip->ngpio);
-- 
2.35.1