linux-kernel - [PATCH] gpio: idt3243x: Fix IRQ check in idt_gpio

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Message-Id: <20220114065125.21208-1-linmq006@gmail.com>
Date:   Fri, 14 Jan 2022 06:51:24 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] gpio: idt3243x: Fix IRQ check in idt_gpio_probe

platform_get_irq() returns negative error number instead 0 on failure.
And the doc of platform_get_irq() provides a usage example:

    int irq = platform_get_irq(pdev, 0);
    if (irq < 0)
        return irq;

Fix the check of return value to catch errors correctly.

Fixes: 4195926aedca ("gpio: Add support for IDT 79RC3243x GPIO controller")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/gpio/gpio-idt3243x.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-idt3243x.c b/drivers/gpio/gpio-idt3243x.c
index 50003ad2e589..08493b05be2d 100644
--- a/drivers/gpio/gpio-idt3243x.c
+++ b/drivers/gpio/gpio-idt3243x.c
@@ -164,8 +164,8 @@ static int idt_gpio_probe(struct platform_device *pdev)
 			return PTR_ERR(ctrl->pic);
 
 		parent_irq = platform_get_irq(pdev, 0);
-		if (!parent_irq)
-			return -EINVAL;
+		if (parent_irq < 0)
+			return parent_irq;
 
 		girq = &ctrl->gc.irq;
 		girq->chip = &idt_gpio_irqchip;
-- 
2.17.1