linux-kernel - [PATCH] drivers/misc: Fix IRQ check

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Message-Id: <20220210061204.1608604-1-chi.minghao@zte.com.cn>
Date:   Thu, 10 Feb 2022 06:12:04 +0000
From:   cgel.zte@...il.com
To:     codrin.ciubotariu@...rochip.com
Cc:     arnd@...db.de, gregkh@...uxfoundation.org,
        nicolas.ferre@...rochip.com, alexandre.belloni@...tlin.com,
        ludovic.desroches@...rochip.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] drivers/misc: Fix IRQ check

From: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>

platform_get_irq() returns negative error number instead 0 on failure.
Fix the check of return value to catch errors correctly.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>
---
 drivers/misc/atmel-ssc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/atmel-ssc.c b/drivers/misc/atmel-ssc.c
index d6cd5537126c..69f9b0336410 100644
--- a/drivers/misc/atmel-ssc.c
+++ b/drivers/misc/atmel-ssc.c
@@ -232,9 +232,9 @@ static int ssc_probe(struct platform_device *pdev)
 	clk_disable_unprepare(ssc->clk);
 
 	ssc->irq = platform_get_irq(pdev, 0);
-	if (!ssc->irq) {
+	if (ssc->irq < 0) {
 		dev_dbg(&pdev->dev, "could not get irq\n");
-		return -ENXIO;
+		return ssc->irq;
 	}
 
 	mutex_lock(&user_lock);
-- 
2.25.1