diff options
Diffstat (limited to 'drivers/gpu/drm/scheduler/sched_entity.c')
| -rw-r--r-- | drivers/gpu/drm/scheduler/sched_entity.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/gpu/drm/scheduler/sched_entity.c b/drivers/gpu/drm/scheduler/sched_entity.c index 4d42b1e4daa6..3c4f5a392b06 100644 --- a/drivers/gpu/drm/scheduler/sched_entity.c +++ b/drivers/gpu/drm/scheduler/sched_entity.c @@ -81,12 +81,16 @@ int drm_sched_entity_init(struct drm_sched_entity *entity, */ 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. + /* 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. Choose + * the lowest priority available. */ - if (entity->priority >= sched_list[0]->num_rqs) - entity->priority = max_t(u32, sched_list[0]->num_rqs, - DRM_SCHED_PRIORITY_MIN); + 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_KERNEL); + } entity->rq = sched_list[0]->sched_rq[entity->priority]; } |