[PATCH] drm/amdgpu: fix max_entries calculation

[Christian König]

Calculate the correct value for max_entries or we might run after the
page_address array.

Signed-off-by: Christian König <christian.koenig at amd.com>
Fixes: 1e691e244487 drm/amdgpu: stop allocating dummy GTT nodes
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 8bc2253939be..8aa9584c184f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1697,7 +1697,8 @@ static int amdgpu_vm_bo_split_mapping(struct amdgpu_device *adev,
 				AMDGPU_GPU_PAGES_IN_CPU_PAGE;
 		} else {
 			addr = 0;
-			max_entries = S64_MAX;
+			max_entries = ((mapping->last - mapping->start) >>
+				       AMDGPU_GPU_PAGE_SHIFT) + 1;
 		}
 
 		if (pages_addr) {
-- 
2.17.1