Rather than silenty mapping nothing, treat this as an error. It should never happen, but if it does we want to flag the VM as unusable.
Signed-off-by: Rob Clark <[email protected]> --- drivers/gpu/drm/msm/msm_iommu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c index c2950d32c507..255972323f9a 100644 --- a/drivers/gpu/drm/msm/msm_iommu.c +++ b/drivers/gpu/drm/msm/msm_iommu.c @@ -186,6 +186,10 @@ __do_map(unsigned long pgsize_bitmap, u64 iova, struct sg_table *sgt, size_t off size -= mapped; len -= mapped; + /* If nothing was mapped, consider it an ENOMEM. */ + if (!ret && !mapped) + ret = -ENOMEM; + if (ret) { __do_unmap(pgsize_bitmap, iova, addr - iova, arg, ops); return -EINVAL; -- 2.56.0
