[PATCH 1/3] drm: Balance error path for GEM handle allocation

[Chris Wilson]

The current error path for failure when establishing a handle for a GEM
object is unbalance, e.g. we call object_close() without calling first
object_open(). Use the typical onion structure to only undo what has
been set up prior to the error.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/drm_gem.c | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 2e10bba4468b..a08176debc0e 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -343,27 +343,32 @@ drm_gem_handle_create_tail(struct drm_file *file_priv,
        spin_unlock(&file_priv->table_lock);
        idr_preload_end();
        mutex_unlock(&dev->object_name_lock);
-       if (ret < 0) {
-               drm_gem_object_handle_unreference_unlocked(obj);
-               return ret;
-       }
+       if (ret < 0)
+               goto err_unref;
+
        *handlep = ret;

        ret = drm_vma_node_allow(&obj->vma_node, file_priv->filp);
-       if (ret) {
-               drm_gem_handle_delete(file_priv, *handlep);
-               return ret;
-       }
+       if (ret)
+               goto err_remove;

        if (dev->driver->gem_open_object) {
                ret = dev->driver->gem_open_object(obj, file_priv);
-               if (ret) {
-                       drm_gem_handle_delete(file_priv, *handlep);
-                       return ret;
-               }
+               if (ret)
+                       goto err_revoke;
        }

        return 0;
+
+err_revoke:
+       drm_vma_node_revoke(&obj->vma_node, file_priv->filp);
+err_remove:
+       spin_lock(&file_priv->table_lock);
+       idr_remove(&file_priv->object_idr, *handlep);
+       spin_unlock(&file_priv->table_lock);
+err_unref:
+       drm_gem_object_handle_unreference_unlocked(obj);
+       return ret;
 }

 /**
-- 
2.6.4