linux-kernel - [PATCH] mfd: fix error check return value of platform_get

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Message-Id: <20220412085305.2533030-1-lv.ruyi@zte.com.cn>
Date:   Tue, 12 Apr 2022 08:53:05 +0000
From:   cgel.zte@...il.com
To:     lee.jones@...aro.org, gremlin@...mlin.it
Cc:     gregkh@...uxfoundation.org, mad_soft@...ox.ru,
        linus.walleij@...aro.org, linux-kernel@...r.kernel.org,
        Lv Ruyi <lv.ruyi@....com.cn>, Zeal Robot <zealci@....com.cn>
Subject: [PATCH] mfd: fix error check return value of platform_get_irq()

From: Lv Ruyi <lv.ruyi@....com.cn>

platform_get_irq() return negative value on failure, so null check of
irq is incorrect. Fix it by comparing whether it is less than zero.

Fixes: dcc21cc09e3c ("mfd: Add driver for Atmel Microcontroller on iPaq h3xxx")
Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
 drivers/mfd/ipaq-micro.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/ipaq-micro.c b/drivers/mfd/ipaq-micro.c
index e92eeeb67a98..4cd5ecc72211 100644
--- a/drivers/mfd/ipaq-micro.c
+++ b/drivers/mfd/ipaq-micro.c
@@ -403,7 +403,7 @@ static int __init micro_probe(struct platform_device *pdev)
 	micro_reset_comm(micro);
 
 	irq = platform_get_irq(pdev, 0);
-	if (!irq)
+	if (irq < 0)
 		return -EINVAL;
 	ret = devm_request_irq(&pdev->dev, irq, micro_serial_isr,
 			       IRQF_SHARED, "ipaq-micro",
-- 
2.25.1