Apart from some code inside ttm itself and nouveau_bo_vma_del, this is the only place where ttm_bo_wait is used without a reservation. Fix this so we can remove the fence_lock later on.
After the switch to rcu the reservation lock will be removed again.
Signed-off-by: Maarten Lankhorst maarten.lankhorst@canonical.com --- drivers/gpu/drm/nouveau/nouveau_gem.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c index df9d451afdcd..0da3740f150f 100644 --- a/drivers/gpu/drm/nouveau/nouveau_gem.c +++ b/drivers/gpu/drm/nouveau/nouveau_gem.c @@ -886,17 +886,31 @@ nouveau_gem_ioctl_cpu_prep(struct drm_device *dev, void *data, struct drm_gem_object *gem; struct nouveau_bo *nvbo; bool no_wait = !!(req->flags & NOUVEAU_GEM_CPU_PREP_NOWAIT); - int ret = -EINVAL; + int ret; + struct nouveau_fence *fence = NULL;
gem = drm_gem_object_lookup(dev, file_priv, req->handle); if (!gem) return -ENOENT; nvbo = nouveau_gem_object(gem);
- spin_lock(&nvbo->bo.bdev->fence_lock); - ret = ttm_bo_wait(&nvbo->bo, true, true, no_wait); - spin_unlock(&nvbo->bo.bdev->fence_lock); + ret = ttm_bo_reserve(&nvbo->bo, true, false, false, 0); + if (!ret) { + spin_lock(&nvbo->bo.bdev->fence_lock); + ret = ttm_bo_wait(&nvbo->bo, true, true, true); + if (!no_wait && ret) + fence = nouveau_fence_ref(nvbo->bo.sync_obj); + spin_unlock(&nvbo->bo.bdev->fence_lock); + + ttm_bo_unreserve(&nvbo->bo); + } drm_gem_object_unreference_unlocked(gem); + + if (fence) { + ret = nouveau_fence_wait(fence, true, no_wait); + nouveau_fence_unref(&fence); + } + return ret; }