linux-kernel - [PATCH -next v2] drm/exynos/iommu: fix return value check in drm_create_iommu

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Message-ID: <CAPgLHd8Bft7nY1A2S87vB2NbVOKBJreLNk_ti18WsauOLq-juw@mail.gmail.com>
Date:	Mon, 10 Dec 2012 02:11:13 -0500
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	inki.dae@...sung.com, jy0922.shim@...sung.com,
	sw0312.kim@...sung.com, kyungmin.park@...sung.com, airlied@...ux.ie
Cc:	yongjun_wei@...ndmicro.com.cn, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH -next v2] drm/exynos/iommu: fix return value check in drm_create_iommu_mapping()

From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

In case of error, function arm_iommu_create_mapping() returns
ERR_PTR() and never returns NULL. The NULL test in the return
value check should be replaced with IS_ERR().

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 drivers/gpu/drm/exynos/exynos_drm_iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.c b/drivers/gpu/drm/exynos/exynos_drm_iommu.c
index 09db198..2482b7f 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_iommu.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.c
@@ -56,8 +56,8 @@ int drm_create_iommu_mapping(struct drm_device *drm_dev)
 	mapping = arm_iommu_create_mapping(&platform_bus_type, priv->da_start,
 						priv->da_space_size,
 						priv->da_space_order);
-	if (!mapping)
-		return -ENOMEM;
+	if (IS_ERR(mapping))
+		return PTR_ERR(mapping);
 
 	dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
 					GFP_KERNEL);


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