[Intel-gfx] [PATCH v6 07/11] drm/i915: add syncobj timeline support

[Chris Wilson]

Quoting Lionel Landwerlin (2019-07-01 12:34:33)
> +               /*
> +                * For timeline syncobjs we need to preallocate chains for
> +                * later signaling.
> +                */
> +               if (point != 0 && user_fence.flags & I915_EXEC_FENCE_SIGNAL) {
> +                       fences[n].chain_fence =
> +                               kmalloc(sizeof(*fences[n].chain_fence),
> +                                       GFP_KERNEL);
> +                       if (!fences[n].chain_fence) {
> +                               dma_fence_put(fence);
> +                               drm_syncobj_put(syncobj);
> +                               err = -ENOMEM;
> +                               DRM_DEBUG("Unable to alloc chain_fence\n");

This is like throwing a grenade, waiting for the explosion, and then
saying "bang" under your breath. :)
-Chris