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From:   Dongliang Mu <dzm91@hust.edu.cn>
To:     Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <brgl@bgdev.pl>,
        Marc Zyngier <maz@kernel.org>
Cc:     Dongliang Mu <mudongliangabcd@gmail.com>,
        linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] gpio: tqmx86: fix uninitialized variable girq
Date:   Mon, 19 Sep 2022 11:12:49 +0800
Message-Id: <20220919031250.770285-1-dzm91@hust.edu.cn>
MIME-Version: 1.0
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Precedence: bulk

From: Dongliang Mu <mudongliangabcd@gmail.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 moving irq_domain_set_pm_device into if true branch
as suggested by Marc Zyngier.

Fixes: 924610607f19 ("gpio: tpmx86: Move PM device over to irq domain")
Suggested-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com>
---
v1->v2: modify fix method to moving irq_domain_set_pm_device into
if true branch as suggested by Marc Zyngier
 drivers/gpio/gpio-tqmx86.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-tqmx86.c b/drivers/gpio/gpio-tqmx86.c
index fa4bc7481f9a..e739dcea61b2 100644
--- a/drivers/gpio/gpio-tqmx86.c
+++ b/drivers/gpio/gpio-tqmx86.c
@@ -307,6 +307,8 @@ static int tqmx86_gpio_probe(struct platform_device *pdev)
 		girq->default_type = IRQ_TYPE_NONE;
 		girq->handler = handle_simple_irq;
 		girq->init_valid_mask = tqmx86_init_irq_valid_mask;
+
+		irq_domain_set_pm_device(girq->domain, dev);
 	}
 
 	ret = devm_gpiochip_add_data(dev, chip, gpio);
@@ -315,8 +317,6 @@ static int tqmx86_gpio_probe(struct platform_device *pdev)
 		goto out_pm_dis;
 	}
 
-	irq_domain_set_pm_device(girq->domain, dev);
-
 	dev_info(dev, "GPIO functionality initialized with %d pins\n",
 		 chip->ngpio);
 
-- 
2.35.1