linux-kernel - [PATCH] misc: atmel-ssc: Fix IRQ check in ssc

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Date:   Fri, 14 Jan 2022 06:23:07 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Haavard Skinnemoen <hskinnemoen@...el.com>,
        Hans-Christian Egtvedt <hcegtvedt@...el.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] misc: atmel-ssc: Fix IRQ check in ssc_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: eb1f2930609b ("Driver for the Atmel on-chip SSC on AT32AP and AT91")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 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);
-- 
2.17.1