[Nouveau] [PATCH] drm: sgdma: add comment around suspiscious error handler

[Alexandre Courbot]

Common programming sense dictates that resources allocated by a function
are freed by this function should it fails, but this is not the case for
the allocated structure of nouveau_sgdma_create_ttm(). It seems that
n00b contributors attempt to fix this one like bugs flying towards a bug
zapper, so add a comment to hopefully prevent this from happening
anymore.

Signed-off-by: Alexandre Courbot <acourbot at nvidia.com>
---
 drm/nouveau_sgdma.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drm/nouveau_sgdma.c b/drm/nouveau_sgdma.c
index ec76c0b4e452..23c377a6c761 100644
--- a/drm/nouveau_sgdma.c
+++ b/drm/nouveau_sgdma.c
@@ -106,6 +106,11 @@ nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
 		nvbe->ttm.ttm.func = &nv50_sgdma_backend;
 
 	if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
+		/*
+		 * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
+		 * and thus our nouveau_sgdma_destroy() hook, so we don't need
+		 * to free nvbe here.
+		 */
 		return NULL;
 	return &nvbe->ttm.ttm;
 }
-- 
2.1.3