diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2016-12-08 00:45:27 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2016-12-08 12:29:22 +0300 |
| commit | 72a93e8dd52c9feea42f1258d555e6070680a347 (patch) | |
| tree | 881432ea83e9dfb888bfd5a52d5175f22703a4a9 /drivers/gpu/drm/drm_prime.c | |
| parent | f3f4c4d68a2862c361fd9890998275da5ef02724 (diff) | |
| download | linux-72a93e8dd52c9feea42f1258d555e6070680a347.tar.xz | |
drm: Take ownership of the dmabuf->obj when exporting
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
Diffstat (limited to 'drivers/gpu/drm/drm_prime.c')
| -rw-r--r-- | drivers/gpu/drm/drm_prime.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index b22a94dd7b53..8d77b2462594 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -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; } |