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drm/nouveau: sgdma: add comment around suspiscious error handler

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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@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Alexandre Courbot 2014-12-11 04:07:20 +09:00 committed by Ben Skeggs
parent 2474ae2942
commit 495b21761a
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/nouveau/nouveau_sgdma.c
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@ -106,6 +106,11 @@ nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
nvbe->ttm.ttm.func = &nv50_sgdma_backend; nvbe->ttm.ttm.func = &nv50_sgdma_backend;
if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page)) 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 NULL;
return &nvbe->ttm.ttm; return &nvbe->ttm.ttm;
} }