drm/msm/adreno: fix probe without iommu
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: ccac7ce3 ("drm/msm: Refactor address space initialization") Signed-off-by: Luca Weiss <luca@z3ntu.xyz> Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org> Signed-off-by: Rob Clark <robdclark@chromium.org>
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