[PATCH 2/2] drm/i915: use drm_mm_remove_node instead of put_block

[David Herrmann]

Hi

On Mon, Jul 1, 2013 at 10:05 PM, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:
> When converting to the preallocated drm_mm_node interfaces in
>
> commit dc9dd7a20fde95aa81a8307cde79c2dff9f83f3d
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Fri Dec 7 20:37:07 2012 +0000
>
>     drm/i915: Preallocate the drm_mm_node prior to manipulating the GTT drm_mm
>
> only the allocation side was converted, but not the freeing. Fix this
> up.
>
> Note that the only difference between put_block and remove_node is
> that the former fills up the preallocation cache. Which we don't need
> anyway and hence is just wasted space.
>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Ben Widawsky <ben at bwidawsk.net>
> Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
>  drivers/gpu/drm/i915/i915_gem.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 4200c32..30fd694 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -2620,7 +2620,7 @@ i915_gem_object_unbind(struct drm_i915_gem_object *obj)
>         /* Avoid an unnecessary call to unbind on rebind. */
>         obj->map_and_fenceable = true;
>
> -       drm_mm_put_block(obj->gtt_space);
> +       drm_mm_remove_node(obj->gtt_space);

kfree(obj->gtt_space);

>         obj->gtt_space = NULL;
>         obj->gtt_offset = 0;
>
> @@ -3137,14 +3137,14 @@ search_free:
>         }
>         if (WARN_ON(!i915_gem_valid_gtt_space(dev, node, obj->cache_level))) {
>                 i915_gem_object_unpin_pages(obj);
> -               drm_mm_put_block(node);
> +               drm_mm_remove_node(node);

kfree(node);

>                 return -EINVAL;
>         }
>
>         ret = i915_gem_gtt_prepare_object(obj);
>         if (ret) {
>                 i915_gem_object_unpin_pages(obj);
> -               drm_mm_put_block(node);
> +               drm_mm_remove_node(node);

kfree(node);

drm_mm_remove_node() does unlink the node but not remove it. Btw., I
have these fixes in my series, too. I will push it later and write the
git-link to #dri-devel.

Cheers
David

>                 return ret;
>         }
>
> --
> 1.7.11.7
>