linux-kernel - [PATCH 5.4 075/453] drm/mcde: Fix handling of platform_get

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Date:   Mon, 28 Dec 2020 13:45:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Krzysztof Kozlowski <krzk@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 075/453] drm/mcde: Fix handling of platform_get_irq() error

From: Krzysztof Kozlowski <krzk@...nel.org>

[ Upstream commit e2dae672a9d5e11856fe30ede63467c65f999a81 ]

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

Fixes: 5fc537bfd000 ("drm/mcde: Add new driver for ST-Ericsson MCDE")
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200827071107.27429-1-krzk@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/mcde/mcde_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mcde/mcde_drv.c b/drivers/gpu/drm/mcde/mcde_drv.c
index 16e5fb9ec784d..82946ffcb6d21 100644
--- a/drivers/gpu/drm/mcde/mcde_drv.c
+++ b/drivers/gpu/drm/mcde/mcde_drv.c
@@ -410,8 +410,8 @@ static int mcde_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (!irq) {
-		ret = -EINVAL;
+	if (irq < 0) {
+		ret = irq;
 		goto clk_disable;
 	}
 
-- 
2.27.0