Lin.Cao f5ee8a39f0 drm/sched: Remove optimization that causes hang when killing dependent jobs ...

commit 15f77764e9 upstream.

When application A submits jobs and application B submits a job with a
dependency on A's fence, the normal flow wakes up the scheduler after
processing each job. However, the optimization in
drm_sched_entity_add_dependency_cb() uses a callback that only clears
dependencies without waking up the scheduler.

When application A is killed before its jobs can run, the callback gets
triggered but only clears the dependency without waking up the scheduler,
causing the scheduler to enter sleep state and application B to hang.

Remove the optimization by deleting drm_sched_entity_clear_dep() and its
usage, ensuring the scheduler is always woken up when dependencies are
cleared.

Fixes: 777dbd458c ("drm/amdgpu: drop a dummy wakeup scheduler")
Cc: stable@vger.kernel.org # v4.6+
Signed-off-by: Lin.Cao <lincao12@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://lore.kernel.org/r/20250717084453.921097-1-lincao12@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2025-08-01 09:48:42 +01:00

..

gpu_scheduler_trace.h

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Makefile

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sched_entity.c

drm/sched: Remove optimization that causes hang when killing dependent jobs

2025-08-01 09:48:42 +01:00

sched_fence.c

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sched_main.c

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