[PATCH v3 6/6] drm/msm: Treat !mapped as an error
From: Rob Clark
Date: Tue Oct 27 2026 - 19:08:40 EST
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 <robin.clark@xxxxxxxxxxxxxxxx>
---
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