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.
Signed-off-by: Pixel Ding <Pixel.Ding at amd.com>
---
drivers/gpu/drm/scheduler/gpu_scheduler.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler.c b/drivers/gpu/drm/scheduler/gpu_scheduler.c
index 4968867da7a6..b937b6dc00a9 100644
--- a/drivers/gpu/drm/scheduler/gpu_scheduler.c
+++ b/drivers/gpu/drm/scheduler/gpu_scheduler.c
@@ -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(&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,
--
2.11.0
