[PATCH] drm/amdgpu: Fix a bug in amdgpu_fill_buffer()

[Yong Zhao]

When max_bytes is not 8 bytes aligned and bo size is larger than
max_bytes, the last 8 bytes in a ttm node may be left unchanged.
For example, on pre SDMA 4.0, max_bytes = 0x1fffff, and the bo size
is 0x200000, the problem will happen. This commit fixed that.

Change-Id: I37c588a57cb63f1a8251fb5ead2eff4b39e047c9
Signed-off-by: Yong Zhao <yong.zhao at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 2180ed3..257361a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1619,7 +1619,8 @@ int amdgpu_fill_buffer(struct amdgpu_bo *bo,
 
 		dst_addr = amdgpu_mm_node_addr(&bo->tbo, mm_node, &bo->tbo.mem);
 		while (byte_count) {
-			uint32_t cur_size_in_bytes = min(byte_count, max_bytes);
+			uint32_t cur_size_in_bytes =
+					min(byte_count, max_bytes) & ~0x7;
 
 			amdgpu_vm_set_pte_pde(adev, &job->ibs[0],
 					dst_addr, 0,
-- 
2.7.4