[patch 117/192] drm/amdgpu: use vma_lookup() in amdgpu_ttm_tt_get_user_pages()

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From: Liam Howlett <liam.howlett@xxxxxxxxxx>
Subject: drm/amdgpu: use vma_lookup() in amdgpu_ttm_tt_get_user_pages()

Use vma_lookup() to find the VMA at a specific address.  As vma_lookup()
will return NULL if the address is not within any VMA, the start address
no longer needs to be validated.

Link: https://lkml.kernel.org/r/20210521174745.2219620-14-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Reviewed-by: Laurent Dufour <ldufour@xxxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Davidlohr Bueso <dbueso@xxxxxxx>
Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c~drm-amdgpu-use-vma_lookup-in-amdgpu_ttm_tt_get_user_pages
+++ a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -709,8 +709,8 @@ int amdgpu_ttm_tt_get_user_pages(struct
 	}
 
 	mmap_read_lock(mm);
-	vma = find_vma(mm, start);
-	if (unlikely(!vma || start < vma->vm_start)) {
+	vma = vma_lookup(mm, start);
+	if (unlikely(!vma)) {
 		r = -EFAULT;
 		goto out_unlock;
 	}
_



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