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drm/scheduler: move last_sched fence updating prior to job popping (v2) 

Make sure main thread won't update last_sched fence when entity
is cleanup.

Fix a racing issue which is caused by putting last_sched fence
twice. Running vulkaninfo in tight loop can produce this issue
as seeing wild fence pointer.

v2: squash in build fix (Christian)

Signed-off-by: Pixel Ding <Pixel.Ding@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Monk Liu <Monk.Liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Pixel Ding 2018-04-18 04:37:40 -04:00 committed by Alex Deucher
parent a4b3996aee
commit b5b4ea4d98
1 changed files with 3 additions and 3 deletions
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6
drivers/gpu/drm/scheduler/gpu_scheduler.c
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@ -402,6 +402,9 @@ drm_sched_entity_pop_job(struct drm_sched_entity *entity)
if (entity->guilty && atomic_read(entity->guilty))
dma_fence_set_error(&sched_job->s_fence->finished, -ECANCELED);
dma_fence_put(entity->last_scheduled);
entity->last_scheduled = dma_fence_get(&sched_job->s_fence->finished);
spsc_queue_pop(&entity->job_queue);
return sched_job;
}
@ -715,9 +718,6 @@ static int drm_sched_main(void *param)
fence = sched->ops->run_job(sched_job);
drm_sched_fence_scheduled(s_fence);
dma_fence_put(entity->last_scheduled);
entity->last_scheduled = dma_fence_get(&s_fence->finished);
if (fence) {
s_fence->parent = dma_fence_get(fence);
r = dma_fence_add_callback(fence, &s_fence->cb,