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drm/i915/gvt: Keep obj->dma_buf link NULL during exporting

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According to commit (319c933c71)
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Thu Aug 15 00:02:46 2013 +0200

    drm/prime: proper locking+refcounting for obj->dma_buf link

obj->dma_buf link should be reinstated at import time.

Gvt-g dma-buf buffer exposeing might be simpler, as there won't be much
racing during Gvt-g dma-buf exposing. In other words, Gvt-g dma-buf
exposing can guarantee exposing happens before gem close ioctl, and Gvt-g
is the only exporter of the guest framebuffer.

But following the drm prime scheme can give Gvt-g a chance to increase a
dma-buf reference count during importing. Otherwise, we have to increase
the reference during exposing, which will break the case that the only
reference userspace has held was through the dma-buf fd and the reference
count is one.

Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Hang Yuan <hang.yuan@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Tina Zhang 2018-01-15 14:41:42 +08:00 committed by Rodrigo Vivi
parent cc4f8fc72e
commit 412718a109
1 changed files with 0 additions and 1 deletions
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drivers/gpu/drm/i915/gvt/dmabuf.c
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@ -472,7 +472,6 @@ int intel_vgpu_get_dmabuf(struct intel_vgpu *vgpu, unsigned int dmabuf_id)
ret = PTR_ERR(dmabuf);
goto out_free_gem;
}
obj->base.dma_buf = dmabuf;
i915_gem_object_put(obj);