From: "Jiadong.Zhu" <jiadong....@amd.com>
The current position calulated in gfx_v9_0_ring_emit_patch_cond_exec
underflows when the wptr is divisible by ring->buf_mask + 1.
Signed-off-by: Jiadong.Zhu <jiadong....@amd.com>
---
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index c568a4f5b81e..65f8c8d4f4ae 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -5754,7 +5754,7 @@ static void gfx_v9_0_ring_emit_patch_cond_exec(struct
amdgpu_ring *ring, unsigne
BUG_ON(offset > ring->buf_mask);
BUG_ON(ring->ring[offset] != 0x55aa55aa);
- cur = (ring->wptr & ring->buf_mask) - 1;
+ cur = (ring->wptr - 1) & ring->buf_mask;
if (likely(cur > offset))
ring->ring[offset] = cur - offset;
else
--
2.25.1
