X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=drivers%2Fgpu%2Fdrm%2Fmsm%2Fmsm_gpu.c;h=6b02ada6579a737d36f6ad7403ad53519ee7e0f7;hb=9589fcde27a6726b83bc525fba5c57e4b2c0328e;hp=8f70d9248ac55f7921acdaaea221577434bb3029;hpb=473e0bc39bd5d2542e90edc622a65bd49206409d;p=firefly-linux-kernel-4.4.55.git

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 8f70d9248ac5..6b02ada6579a 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -651,6 +651,14 @@ int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 	if (iommu) {
 		dev_info(drm->dev, "%s: using IOMMU\n", name);
 		gpu->mmu = msm_iommu_new(&pdev->dev, iommu);
+		if (IS_ERR(gpu->mmu)) {
+			ret = PTR_ERR(gpu->mmu);
+			dev_err(drm->dev, "failed to init iommu: %d\n", ret);
+			gpu->mmu = NULL;
+			iommu_domain_free(iommu);
+			goto fail;
+		}
+
 	} else {
 		dev_info(drm->dev, "%s: no IOMMU, fallback to VRAM carveout!\n", name);
 	}