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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Krzysztof Kozlowski <krzk@kernel.org>,
        Chen-Yu Tsai <wens@csie.org>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.9 568/757] Input: sun4i-ps2 - fix handling of platform_get_irq() error
Date:   Tue, 27 Oct 2020 14:53:38 +0100
Message-Id: <20201027135517.152428776@linuxfoundation.org>
In-Reply-To: <20201027135450.497324313@linuxfoundation.org>
References: <20201027135450.497324313@linuxfoundation.org>
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From: Krzysztof Kozlowski <krzk@kernel.org>

[ Upstream commit cafb3abea6136e59ea534004e5773361e196bb94 ]

platform_get_irq() returns -ERRNO on error.  In such case comparison
to 0 would pass the check.

Fixes: e443631d20f5 ("Input: serio - add support for Alwinner A10/A20 PS/2 controller")
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Link: https://lore.kernel.org/r/20200828145744.3636-4-krzk@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/input/serio/sun4i-ps2.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/input/serio/sun4i-ps2.c b/drivers/input/serio/sun4i-ps2.c
index a681a2c04e399..f15ed3dcdb9b2 100644
--- a/drivers/input/serio/sun4i-ps2.c
+++ b/drivers/input/serio/sun4i-ps2.c
@@ -211,7 +211,6 @@ static int sun4i_ps2_probe(struct platform_device *pdev)
 	struct sun4i_ps2data *drvdata;
 	struct serio *serio;
 	struct device *dev = &pdev->dev;
-	unsigned int irq;
 	int error;
 
 	drvdata = kzalloc(sizeof(struct sun4i_ps2data), GFP_KERNEL);
@@ -264,14 +263,12 @@ static int sun4i_ps2_probe(struct platform_device *pdev)
 	writel(0, drvdata->reg_base + PS2_REG_GCTL);
 
 	/* Get IRQ for the device */
-	irq = platform_get_irq(pdev, 0);
-	if (!irq) {
-		dev_err(dev, "no IRQ found\n");
-		error = -ENXIO;
+	drvdata->irq = platform_get_irq(pdev, 0);
+	if (drvdata->irq < 0) {
+		error = drvdata->irq;
 		goto err_disable_clk;
 	}
 
-	drvdata->irq = irq;
 	drvdata->serio = serio;
 	drvdata->dev = dev;
 
-- 
2.25.1