From: Rob Clark robdclark@chromium.org
It cannot be atomically updated with obj->active_count, and the only purpose is a useless WARN_ON() (which becomes a buggy WARN_ON() once retire_submits() is not serialized with incoming submits via struct_mutex)
Signed-off-by: Rob Clark robdclark@chromium.org --- drivers/gpu/drm/msm/msm_gem.c | 2 -- drivers/gpu/drm/msm/msm_gem.h | 1 - drivers/gpu/drm/msm/msm_gpu.c | 5 ----- 3 files changed, 8 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c index b04ed8b52f9d..c52a3969e60b 100644 --- a/drivers/gpu/drm/msm/msm_gem.c +++ b/drivers/gpu/drm/msm/msm_gem.c @@ -753,7 +753,6 @@ void msm_gem_active_get(struct drm_gem_object *obj, struct msm_gpu *gpu)
if (!atomic_fetch_inc(&msm_obj->active_count)) { mutex_lock(&priv->mm_lock); - msm_obj->gpu = gpu; list_del_init(&msm_obj->mm_list); list_add_tail(&msm_obj->mm_list, &gpu->active_list); mutex_unlock(&priv->mm_lock); @@ -769,7 +768,6 @@ void msm_gem_active_put(struct drm_gem_object *obj)
if (!atomic_dec_return(&msm_obj->active_count)) { mutex_lock(&priv->mm_lock); - msm_obj->gpu = NULL; list_del_init(&msm_obj->mm_list); list_add_tail(&msm_obj->mm_list, &priv->inactive_list); mutex_unlock(&priv->mm_lock); diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h index e05b1530aca6..61147bd96b06 100644 --- a/drivers/gpu/drm/msm/msm_gem.h +++ b/drivers/gpu/drm/msm/msm_gem.h @@ -64,7 +64,6 @@ struct msm_gem_object { * */ struct list_head mm_list; - struct msm_gpu *gpu; /* non-null if active */
/* Transiently in the process of submit ioctl, objects associated * with the submit are on submit->bo_list.. this only lasts for diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c index fd3fc6f36ab1..c9ff19a75169 100644 --- a/drivers/gpu/drm/msm/msm_gpu.c +++ b/drivers/gpu/drm/msm/msm_gpu.c @@ -800,11 +800,6 @@ void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit) struct drm_gem_object *drm_obj = &msm_obj->base; uint64_t iova;
- /* can't happen yet.. but when we add 2d support we'll have - * to deal w/ cross-ring synchronization: - */ - WARN_ON(is_active(msm_obj) && (msm_obj->gpu != gpu)); - /* submit takes a reference to the bo and iova until retired: */ drm_gem_object_get(&msm_obj->base); msm_gem_get_and_pin_iova(&msm_obj->base, submit->aspace, &iova);