From: Nicolai Hähnle <nicolai.haehnle@xxxxxxx>
amd_sched_process_job drops the fence reference, so NULL out the s_fence
field before adding it as a callback to guard against accidentally using
s_fence after it may have be freed.
Signed-off-by: Nicolai Hähnle <nicolai.haehnle at amd.com>
Acked-by: Christian König <christian.koenig at amd.com>
---
drivers/gpu/drm/amd/scheduler/gpu_scheduler.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c
index e793312e351c..54eb77cffd9b 100644
--- a/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c
+++ b/drivers/gpu/drm/amd/scheduler/gpu_scheduler.c
@@ -604,20 +604,23 @@ static int amd_sched_main(void *param)
if (!sched_job)
continue;
s_fence = sched_job->s_fence;
atomic_inc(&sched->hw_rq_count);
amd_sched_job_begin(sched_job);
fence = sched->ops->run_job(sched_job);
amd_sched_fence_scheduled(s_fence);
+
+ sched_job->s_fence = NULL;
+
if (fence) {
s_fence->parent = dma_fence_get(fence);
r = dma_fence_add_callback(fence, &s_fence->cb,
amd_sched_process_job);
if (r == -ENOENT)
amd_sched_process_job(fence, &s_fence->cb);
else if (r)
DRM_ERROR("fence add callback failed (%d)\n",
r);
dma_fence_put(fence);
--
2.11.0
