[PATCH 4.13 28/47] drm/vgem: Pin our pages for dmabuf exports

4.13-stable review patch. If anyone has any objections, please let me know. -- From: Chris Wilson commit 71bb23c707c141b176bc084179ca5ee58d5fd26a upstream. When the caller maps their dmabuf and we return an sg_table, the caller doesn't expect the

[PATCH 4.13 28/47] drm/vgem: Pin our pages for dmabuf exports

4.13-stable review patch. If anyone has any objections, please let me know. -- From: Chris Wilson commit 71bb23c707c141b176bc084179ca5ee58d5fd26a upstream. When the caller maps their dmabuf and we return an sg_table, the caller doesn't expect the pages beneath that sg_table