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authorNicolai Hähnle <nicolai.haehnle@amd.com>2017-02-14 10:37:41 +0100
committerAlex Deucher <alexander.deucher@amd.com>2017-03-29 23:53:06 -0400
commit882e8cfcbc2157448976c9d37af4fc144949559f (patch)
tree7a93dc307404a5f6d0aa2d850623ee142e8b8a1b /include/drm/ttm
parentb9d022c630fa77c7044ea21e2597245a91e69856 (diff)
drm/ttm: fix the documentation of ttm_bo_init
As the comment says: callers of ttm_bo_init cannot rely on having the only reference to the BO when the function returns successfully. Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'include/drm/ttm')
-rw-r--r--include/drm/ttm/ttm_bo_api.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 8f619f499e55..de5f992de928 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -463,7 +463,11 @@ size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
* As this object may be part of a larger structure, this function,
* together with the @destroy function,
* enables driver-specific objects derived from a ttm_buffer_object.
- * On successful return, the object kref and list_kref are set to 1.
+ *
+ * On successful return, the caller owns an object kref to @bo. The kref and
+ * list_kref are usually set to 1, but note that in some situations, other
+ * tasks may already be holding references to @bo as well.
+ *
* If a failure occurs, the function will call the @destroy function, or
* kfree() if @destroy is NULL. Thus, after a failure, dereferencing @bo is
* illegal and will likely cause memory corruption.