drm/exynos/iommu: fix return value check in drm_create_iommu_mapping()

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@trendmicro.com.cn>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.c b/drivers/gpu/drm/exynos/exynos_drm_iommu.c
index 09db1983eb1a56e6cba3f60043c32b63b2c1162e..2482b7f96341ac196c98e10eeed359dcdc0d70ea 100644 (file)
--- 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);