The function iommu_domain_alloc returns NULL on platforms without IOMMU
such as msm8974. This resulted in PTR_ERR(-ENODEV) being assigned to
gpu->aspace so the correct code path wasn't taken.
Fixes: ccac7ce373c1 ("drm/msm: Refactor address space initialization")
Signed-off-by: Luca Weiss <luca@xxxxxxxxx>
---
drivers/gpu/drm/msm/adreno/adreno_gpu.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 862dd35b27d3..6e8bef1a9ea2 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -189,10 +189,16 @@ struct msm_gem_address_space *
adreno_iommu_create_address_space(struct msm_gpu *gpu,
struct platform_device *pdev)
{
- struct iommu_domain *iommu = iommu_domain_alloc(&platform_bus_type);
- struct msm_mmu *mmu = msm_iommu_new(&pdev->dev, iommu);
+ struct iommu_domain *iommu;
+ struct msm_mmu *mmu;
struct msm_gem_address_space *aspace;
+ iommu = iommu_domain_alloc(&platform_bus_type);
+ if (!iommu)
+ return NULL;
+
+ mmu = msm_iommu_new(&pdev->dev, iommu);
+
aspace = msm_gem_address_space_create(mmu, "gpu", SZ_16M,
0xffffffff - SZ_16M);
--
2.28.0
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