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

Commit Message

Andrew Morton June 29, 2021, 2:39 a.m. UTC

From: Liam Howlett <[e-mail]>
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/[e-mail]
Signed-off-by: Liam R. Howlett <[e-mail]>
Reviewed-by: Laurent Dufour <[e-mail]>
Acked-by: David Hildenbrand <[e-mail]>
Acked-by: Davidlohr Bueso <[e-mail]>
Acked-by: Alex Deucher <[e-mail]>
Cc: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

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

Patch

--- 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;
 	}