drm/nouveau: add reservation to nouveau_gem_ioctl_cpu_prep
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> Acked-by: Ben Skeggs <bskeggs@redhat.com>
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@ -884,17 +884,31 @@ nouveau_gem_ioctl_cpu_prep(struct drm_device *dev, void *data,
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struct drm_gem_object *gem;
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struct nouveau_bo *nvbo;
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bool no_wait = !!(req->flags & NOUVEAU_GEM_CPU_PREP_NOWAIT);
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int ret = -EINVAL;
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int ret;
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struct nouveau_fence *fence = NULL;
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gem = drm_gem_object_lookup(dev, file_priv, req->handle);
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if (!gem)
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return -ENOENT;
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nvbo = nouveau_gem_object(gem);
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spin_lock(&nvbo->bo.bdev->fence_lock);
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ret = ttm_bo_wait(&nvbo->bo, true, true, no_wait);
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spin_unlock(&nvbo->bo.bdev->fence_lock);
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ret = ttm_bo_reserve(&nvbo->bo, true, false, false, NULL);
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if (!ret) {
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spin_lock(&nvbo->bo.bdev->fence_lock);
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ret = ttm_bo_wait(&nvbo->bo, true, true, true);
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if (!no_wait && ret)
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fence = nouveau_fence_ref(nvbo->bo.sync_obj);
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spin_unlock(&nvbo->bo.bdev->fence_lock);
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ttm_bo_unreserve(&nvbo->bo);
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}
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drm_gem_object_unreference_unlocked(gem);
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if (fence) {
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ret = nouveau_fence_wait(fence, true, no_wait);
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nouveau_fence_unref(&fence);
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}
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return ret;
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}
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