drm/msm: Fix IOMMU clean up path in case msm_iommu_new() fails

msm_iommu_new() can fail and this change makes sure that we
detect the failure and free the allocated domain before going
any further.
Signed-off-by: Stephane Viau <sviau@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.c

@@ -586,6 +586,7 @@ struct msm_kms *mdp5_kms_init(struct drm_device *dev)
 		if (IS_ERR(mmu)) {
 			ret = PTR_ERR(mmu);
 			dev_err(dev->dev, "failed to init iommu: %d\n", ret);
+			iommu_domain_free(config->platform.iommu);
 			goto fail;
 		}
 

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);
 	}