6.6-stable review patch. If anyone has any objections, please let me know.
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From: Lin.Cao lincao12@amd.com
[ Upstream commit 471db2c2d4f80ee94225a1ef246e4f5011733e50 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/scheduler/sched_entity.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c index 53130a50584ca..eed3b8bed9e40 100644 --- a/drivers/gpu/drm/scheduler/sched_entity.c +++ b/drivers/gpu/drm/scheduler/sched_entity.c @@ -167,6 +167,7 @@ static void drm_sched_entity_kill_jobs_work(struct work_struct *wrk) { struct drm_sched_job *job = container_of(wrk, typeof(*job), work);
+ drm_sched_fence_scheduled(job->s_fence, NULL); drm_sched_fence_finished(job->s_fence, -ESRCH); WARN_ON(job->s_fence->parent); job->sched->ops->free_job(job);