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drm: Take ownership of the dmabuf->obj when exporting

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Currently the reference for the dmabuf->obj is incremented for the
dmabuf in drm_gem_prime_handle_to_fd() (at the high level userspace
interface), but is released in drm_gem_dmabuf_release() (the lowlevel
handler). Improve the symmetry of the dmabuf->obj ownership by acquiring
the reference in drm_gem_dmabuf_export(). This makes it easier to use
the prime functions directly.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
[danvet: Update kerneldoc.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20161207214527.22533-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-12-07 21:45:27 +00:00 committed by Daniel Vetter
parent f3f4c4d68a
commit 72a93e8dd5
2 changed files with 7 additions and 6 deletions
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12
drivers/gpu/drm/drm_prime.c
View file

@ -290,7 +290,8 @@ static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
*
* This wraps dma_buf_export() for use by generic GEM drivers that are using
* drm_gem_dmabuf_release(). In addition to calling dma_buf_export(), we take
* a reference to the drm_device which is released by drm_gem_dmabuf_release().
* a reference to the &drm_device and the exported &drm_gem_object (stored in
* exp_info->priv) which is released by drm_gem_dmabuf_release().
*
* Returns the new dmabuf.
*/
@ -300,8 +301,11 @@ struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
struct dma_buf *dma_buf;
dma_buf = dma_buf_export(exp_info);
if (!IS_ERR(dma_buf))
drm_dev_ref(dev);
if (IS_ERR(dma_buf))
return dma_buf;
drm_dev_ref(dev);
drm_gem_object_reference(exp_info->priv);
return dma_buf;
}
@ -472,8 +476,6 @@ static struct dma_buf *export_and_register_object(struct drm_device *dev,
*/
obj->dma_buf = dmabuf;
get_dma_buf(obj->dma_buf);
/* Grab a new ref since the callers is now used by the dma-buf */
drm_gem_object_reference(obj);
return dmabuf;
}

1
drivers/gpu/drm/vgem/vgem_fence.c
View file

@ -126,7 +126,6 @@ static int attach_dmabuf(struct drm_device *dev,
return PTR_ERR(dmabuf);
obj->dma_buf = dmabuf;
drm_gem_object_reference(obj);
return 0;
}