diff options
Diffstat (limited to 'drivers/gpu/drm/drm_prime.c')
-rw-r--r-- | drivers/gpu/drm/drm_prime.c | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 80907b34d857..875df8d719fb 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -284,18 +284,46 @@ static void drm_gem_unmap_dma_buf(struct dma_buf_attachment *attach, } /** + * drm_gem_dmabuf_export - dma_buf export implementation for GEM + * @dma_buf: buffer to be exported + * + * 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(). + * + * Returns the new dmabuf. + */ +struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev, + struct dma_buf_export_info *exp_info) +{ + struct dma_buf *dma_buf; + + dma_buf = dma_buf_export(exp_info); + if (!IS_ERR(dma_buf)) + drm_dev_ref(dev); + + return dma_buf; +} +EXPORT_SYMBOL(drm_gem_dmabuf_export); + +/** * drm_gem_dmabuf_release - dma_buf release implementation for GEM * @dma_buf: buffer to be released * * Generic release function for dma_bufs exported as PRIME buffers. GEM drivers * must use this in their dma_buf ops structure as the release callback. + * drm_gem_dmabuf_release() should be used in conjunction with + * drm_gem_dmabuf_export(). */ void drm_gem_dmabuf_release(struct dma_buf *dma_buf) { struct drm_gem_object *obj = dma_buf->priv; + struct drm_device *dev = obj->dev; /* drop the reference on the export fd holds */ drm_gem_object_unreference_unlocked(obj); + + drm_dev_unref(dev); } EXPORT_SYMBOL(drm_gem_dmabuf_release); @@ -412,7 +440,7 @@ struct dma_buf *drm_gem_prime_export(struct drm_device *dev, if (dev->driver->gem_prime_res_obj) exp_info.resv = dev->driver->gem_prime_res_obj(obj); - return dma_buf_export(&exp_info); + return drm_gem_dmabuf_export(dev, &exp_info); } EXPORT_SYMBOL(drm_gem_prime_export); |