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-rw-r--r--include/drm/drmP.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index a95db49b3f9e..ce1e6bd30306 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -687,6 +687,11 @@ struct drm_gem_object {
*
* The driver's ->gem_free_object callback is responsible for cleaning
* up the dma_buf attachment and references acquired at import time.
+ *
+ * Note that the drm gem/prime core does not depend upon drivers setting
+ * this field any more. So for drivers where this doesn't make sense
+ * (e.g. virtual devices or a displaylink behind an usb bus) they can
+ * simply leave it as NULL.
*/
struct dma_buf_attachment *import_attach;
};