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drm/amd/amdgpu: fix bad job hw_fence use after free in advance tdr 

[Why]
In advance tdr mode, the real bad job will be resubmitted twice, while
in drm_sched_resubmit_jobs_ext, there's a dma_fence_put, so the bad job
is put one more time than other jobs.

[How]
Adding dma_fence_get before resbumit job in
amdgpu_device_recheck_guilty_jobs and put the fence for normal jobs

Signed-off-by: Jingwen Chen <Jingwen.Chen2@amd.com>
Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Jingwen Chen 2021-10-22 11:30:01 +08:00 committed by Alex Deucher
parent d9bd054177
commit 38d4e4638e
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
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@ -4850,6 +4850,9 @@ static void amdgpu_device_recheck_guilty_jobs(
/* clear job's guilty and depend the folowing step to decide the real one */
drm_sched_reset_karma(s_job);
/* for the real bad job, it will be resubmitted twice, adding a dma_fence_get
* to make sure fence is balanced */
dma_fence_get(s_job->s_fence->parent);
drm_sched_resubmit_jobs_ext(&ring->sched, 1);
ret = dma_fence_wait_timeout(s_job->s_fence->parent, false, ring->sched.timeout);
@ -4885,6 +4888,7 @@ retry:
/* got the hw fence, signal finished fence */
atomic_dec(ring->sched.score);
dma_fence_put(s_job->s_fence->parent);
dma_fence_get(&s_job->s_fence->finished);
dma_fence_signal(&s_job->s_fence->finished);
dma_fence_put(&s_job->s_fence->finished);