drm/ttm: Fix buffer object metadata accounting regression v2

A regression was introduced in the 3.3 rc series, commit
"drm/ttm: simplify memory accounting for ttm user v2",
causing the metadata of buffer objects created using the ttm_bo_create()
function to be accounted twice.
That causes massive leaks with the vmwgfx driver running for example
SpecViewperf Catia-03 test 2, eventually killing the app.

Furthermore, the same commit introduces a regression where
metadata accounting is leaked if a buffer object is
initialized with an illegal size. This is also fixed with this commit.

v2: Fixed an error path and removed an unused variable.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index b67cfcaa661f87bffbb84d3f0ed9786efb591e5a..36f4b28c1b90a499043a42b9b2bce9894401d36e 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1204,6 +1204,7 @@ int ttm_bo_init(struct ttm_bo_device *bdev,
                        (*destroy)(bo);
                else
                        kfree(bo);
+               ttm_mem_global_free(mem_glob, acc_size);
                return -EINVAL;
        }
        bo->destroy = destroy;
@@ -1307,22 +1308,14 @@ int ttm_bo_create(struct ttm_bo_device *bdev,
                        struct ttm_buffer_object **p_bo)
 {
        struct ttm_buffer_object *bo;
-       struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
        size_t acc_size;
        int ret;
 
-       acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
-       ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
-       if (unlikely(ret != 0))
-               return ret;
-
        bo = kzalloc(sizeof(*bo), GFP_KERNEL);
-
-       if (unlikely(bo == NULL)) {
-               ttm_mem_global_free(mem_glob, acc_size);
+       if (unlikely(bo == NULL))
                return -ENOMEM;
-       }
 
+       acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct ttm_buffer_object));
        ret = ttm_bo_init(bdev, bo, size, type, placement, page_alignment,
                                buffer_start, interruptible,
                          persistent_swap_storage, acc_size, NULL, NULL);