diff options
Diffstat (limited to 'drivers/gpu/drm/scheduler/sched_entity.c')
| -rw-r--r-- | drivers/gpu/drm/scheduler/sched_entity.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c index a42763e14..0a7a7e4ad 100644 --- a/drivers/gpu/drm/scheduler/sched_entity.c +++ b/drivers/gpu/drm/scheduler/sched_entity.c @@ -75,8 +75,23 @@ int drm_sched_entity_init(struct drm_sched_entity *entity, RCU_INIT_POINTER(entity->last_scheduled, NULL); RB_CLEAR_NODE(&entity->rb_tree_node); - if(num_sched_list) - entity->rq = &sched_list[0]->sched_rq[entity->priority]; + if (!sched_list[0]->sched_rq) { + /* Warn drivers not to do this and to fix their DRM + * calling order. + */ + pr_warn("%s: called with uninitialized scheduler\n", __func__); + } else if (num_sched_list) { + /* The "priority" of an entity cannot exceed the number of run-queues of a + * scheduler. Protect against num_rqs being 0, by converting to signed. + */ + if (entity->priority >= sched_list[0]->num_rqs) { + drm_err(sched_list[0], "entity with out-of-bounds priority:%u num_rqs:%u\n", + entity->priority, sched_list[0]->num_rqs); + entity->priority = max_t(s32, (s32) sched_list[0]->num_rqs - 1, + (s32) DRM_SCHED_PRIORITY_MIN); + } + entity->rq = sched_list[0]->sched_rq[entity->priority]; + } init_completion(&entity->entity_idle); @@ -533,7 +548,7 @@ void drm_sched_entity_select_rq(struct drm_sched_entity *entity) spin_lock(&entity->rq_lock); sched = drm_sched_pick_best(entity->sched_list, entity->num_sched_list); - rq = sched ? &sched->sched_rq[entity->priority] : NULL; + rq = sched ? sched->sched_rq[entity->priority] : NULL; if (rq != entity->rq) { drm_sched_rq_remove_entity(entity->rq, entity); entity->rq = rq; |