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drm/amdgpu: Correct the position in patch_cond_exec

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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: Christian König <christian.koenig@amd.com>
Signed-off-by: Jiadong.Zhu <Jiadong.Zhu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jiadong.Zhu 2022-09-15 15:19:20 +08:00 • committed by Alex Deucher
parent e844cc250f
commit 415be17fb2
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
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@ -5429,7 +5429,7 @@ 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