[PATCH 1/8] drm/sched: Add locking to drm_sched_entity_modify_sched
Christian König
ckoenig.leichtzumerken at gmail.com
Tue Sep 10 07:43:35 UTC 2024
Am 09.09.24 um 19:19 schrieb Tvrtko Ursulin:
> From: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>
>
> Without the locking amdgpu currently can race between
> amdgpu_ctx_set_entity_priority() (via drm_sched_entity_modify_sched()) and
> drm_sched_job_arm(), leading to the latter accesing potentially
> inconsitent entity->sched_list and entity->num_sched_list pair.
>
> v2:
> * Improve commit message. (Philipp)
>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>
> Fixes: b37aced31eb0 ("drm/scheduler: implement a function to modify sched list")
> Cc: Christian König <christian.koenig at amd.com>
> Cc: Alex Deucher <alexander.deucher at amd.com>
> Cc: Luben Tuikov <ltuikov89 at gmail.com>
> Cc: Matthew Brost <matthew.brost at intel.com>
> Cc: David Airlie <airlied at gmail.com>
> Cc: Daniel Vetter <daniel at ffwll.ch>
> Cc: dri-devel at lists.freedesktop.org
> Cc: Philipp Stanner <pstanner at redhat.com>
> Cc: <stable at vger.kernel.org> # v5.7+
Reviewed-by: Christian König <christian.koenig at amd.com>
> ---
> drivers/gpu/drm/scheduler/sched_entity.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c
> index 58c8161289fe..ae8be30472cd 100644
> --- a/drivers/gpu/drm/scheduler/sched_entity.c
> +++ b/drivers/gpu/drm/scheduler/sched_entity.c
> @@ -133,8 +133,10 @@ void drm_sched_entity_modify_sched(struct drm_sched_entity *entity,
> {
> WARN_ON(!num_sched_list || !sched_list);
>
> + spin_lock(&entity->rq_lock);
> entity->sched_list = sched_list;
> entity->num_sched_list = num_sched_list;
> + spin_unlock(&entity->rq_lock);
> }
> EXPORT_SYMBOL(drm_sched_entity_modify_sched);
>
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