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drm/nouveau/svm: fix vma range check for migration 

find_vma_intersection(mm, start, end) only guarantees that end is greater
than or equal to vma->vm_start but doesn't guarantee that start is
greater than or equal to vma->vm_start. The calculation for the
intersecting range in nouveau_svmm_bind() isn't accounting for this and
can call migrate_vma_setup() with a starting address less than
vma->vm_start. This results in migrate_vma_setup() returning -EINVAL for
the range instead of nouveau skipping that part of the range and migrating
the rest.

Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ralph Campbell 2020-03-03 16:13:36 -08:00 committed by Ben Skeggs
parent e18c6e8b6f
commit b92103b559
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/nouveau/nouveau_svm.c
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@ -179,6 +179,7 @@ nouveau_svmm_bind(struct drm_device *dev, void *data,
if (!vma)
break;
addr = max(addr, vma->vm_start);
next = min(vma->vm_end, end);
/* This is a best effort so we ignore errors */
nouveau_dmem_migrate_vma(cli->drm, vma, addr, next);