[PATCH -fixes] ttm: Don't return the bo reserved on error path

[Thomas Hellstrom]

An unlikely race could case a bo to be returned reserved on an error path.

Signed-off-by: Thomas Hellstrom <thellstrom at vmware.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 617b646..0bb0f5f 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -574,10 +574,16 @@ retry:
                return ret;

        spin_lock(&glob->lru_lock);
+
+       if (unlikely(list_empty(&bo->ddestroy))) {
+               spin_unlock(&glob->lru_lock);
+               return 0;
+       }
+
        ret = ttm_bo_reserve_locked(bo, interruptible,
                                    no_wait_reserve, false, 0);

-       if (unlikely(ret != 0) || list_empty(&bo->ddestroy)) {
+       if (unlikely(ret != 0)) {
                spin_unlock(&glob->lru_lock);
                return ret;
        }
-- 
1.7.4.4