linux-kernel - [PATCH] misc: atmel_tclib: fix error return code in tc

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Message-ID: <20170809164250.GA7229@embeddedgus>
Date:   Wed, 9 Aug 2017 11:42:50 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH] misc: atmel_tclib: fix error return code in tc_probe()

platform_get_irq() returns an error code, but the atmel_tclib driver
ignores it and always returns -EINVAL. This is not correct and,
prevents -EPROBE_DEFER from being propagated properly.

Print error message and propagate the return value of platform_get_irq
on failure.

This issue was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/misc/atmel_tclib.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/atmel_tclib.c b/drivers/misc/atmel_tclib.c
index ac24a4b..c5d3449 100644
--- a/drivers/misc/atmel_tclib.c
+++ b/drivers/misc/atmel_tclib.c
@@ -112,8 +112,10 @@ static int __init tc_probe(struct platform_device *pdev)
 	unsigned int	i;
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq < 0)
-		return -EINVAL;
+	if (irq < 0) {
+		dev_err(&pdev->dev, "Failed to get IRQ: %d\n", irq);
+		return irq;
+	}
 
 	tc = devm_kzalloc(&pdev->dev, sizeof(struct atmel_tc), GFP_KERNEL);
 	if (!tc)
-- 
2.5.0