[PATCH 6.1 34/55] drm/scheduler: signal scheduled fence when kill job

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lin.Cao <lincao12@amd.com>

commit 471db2c2d4f80ee94225a1ef246e4f5011733e50 upstream.

When an entity from application B is killed, drm_sched_entity_kill()
removes all jobs belonging to that entity through
drm_sched_entity_kill_jobs_work(). If application A's job depends on a
scheduled fence from application B's job, and that fence is not properly
signaled during the killing process, application A's dependency cannot be
cleared.

This leads to application A hanging indefinitely while waiting for a
dependency that will never be resolved. Fix this issue by ensuring that
scheduled fences are properly signaled when an entity is killed, allowing
dependent applications to continue execution.

Signed-off-by: Lin.Cao <lincao12@amd.com>
Reviewed-by: Philipp Stanner <phasta@kernel.org>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20250515020713.1110476-1-lincao12@amd.com
[ Modified drm_sched_fence_scheduled(job->s_fence, NULL) to
  drm_sched_fence_scheduled(job->s_fence) for kernel 6.1.y ]
Signed-off-by: Leon Chen <leonchen.oss@139.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/scheduler/sched_entity.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/scheduler/sched_entity.c
+++ b/drivers/gpu/drm/scheduler/sched_entity.c
@@ -196,6 +196,7 @@ static void drm_sched_entity_kill_jobs_w
 {
 	struct drm_sched_job *job = container_of(wrk, typeof(*job), work);
 
+	drm_sched_fence_scheduled(job->s_fence);
 	drm_sched_fence_finished(job->s_fence);
 	WARN_ON(job->s_fence->parent);
 	job->sched->ops->free_job(job);