Commit b3e45b18 authored by Jiadong.Zhu's avatar Jiadong.Zhu Committed by Alex Deucher

drm/amdgpu: Correct the position in patch_cond_exec

The current position calulated in gfx_v9_0_ring_emit_patch_cond_exec
underflows when the wptr is divisible by ring->buf_mask + 1.
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarJiadong.Zhu <Jiadong.Zhu@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 2d3907c1
...@@ -5597,7 +5597,7 @@ static void gfx_v9_0_ring_emit_patch_cond_exec(struct amdgpu_ring *ring, unsigne ...@@ -5597,7 +5597,7 @@ static void gfx_v9_0_ring_emit_patch_cond_exec(struct amdgpu_ring *ring, unsigne
BUG_ON(offset > ring->buf_mask); BUG_ON(offset > ring->buf_mask);
BUG_ON(ring->ring[offset] != 0x55aa55aa); BUG_ON(ring->ring[offset] != 0x55aa55aa);
cur = (ring->wptr & ring->buf_mask) - 1; cur = (ring->wptr - 1) & ring->buf_mask;
if (likely(cur > offset)) if (likely(cur > offset))
ring->ring[offset] = cur - offset; ring->ring[offset] = cur - offset;
else else
......
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