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Diffstat (limited to 'drivers/gpu/drm/msm/msm_iommu.c')
-rw-r--r--drivers/gpu/drm/msm/msm_iommu.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
index 418e1e06cdde..5cc8d358cc97 100644
--- a/drivers/gpu/drm/msm/msm_iommu.c
+++ b/drivers/gpu/drm/msm/msm_iommu.c
@@ -234,7 +234,12 @@ struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent)
/* Get the pagetable configuration from the domain */
if (adreno_smmu->cookie)
ttbr1_cfg = adreno_smmu->get_ttbr1_cfg(adreno_smmu->cookie);
- if (!ttbr1_cfg)
+
+ /*
+ * If you hit this WARN_ONCE() you are probably missing an entry in
+ * qcom_smmu_impl_of_match[] in arm-smmu-qcom.c
+ */
+ if (WARN_ONCE(!ttbr1_cfg, "No per-process page tables"))
return ERR_PTR(-ENODEV);
pagetable = kzalloc(sizeof(*pagetable), GFP_KERNEL);
@@ -410,7 +415,7 @@ struct msm_mmu *msm_iommu_gpu_new(struct device *dev, struct msm_gpu *gpu, unsig
struct msm_mmu *mmu;
mmu = msm_iommu_new(dev, quirks);
- if (IS_ERR(mmu))
+ if (IS_ERR_OR_NULL(mmu))
return mmu;
iommu = to_msm_iommu(mmu);