drm/vgem: Ditch attach trickery in the fence ioctl

It looks like this was done purely to get a consistent place to look
up the reservation object pointer. With the drm_prime.c helper code
now also setting gem_object->resv for imported objects we can just use
that pointer directly, instead of first ensuring a dma-buf exists.

v2: Note that I screwed up the patch ordering, hence why this needed
a Fixes: tag - CI spotted the broken intermediate state.

Fixes: 5eab998741c8 ("drm/vgem: Drop drm_gem_prime_export")
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190614203615.12639-49-daniel.vetter@ffwll.ch

diff --git a/drivers/gpu/drm/vgem/vgem_fence.c b/drivers/gpu/drm/vgem/vgem_fence.c
index 72d43d5..08997fd 100644 (file)
--- a/drivers/gpu/drm/vgem/vgem_fence.c
+++ b/drivers/gpu/drm/vgem/vgem_fence.c
@@ -100,22 +100,6 @@ static struct dma_fence *vgem_fence_create(struct vgem_file *vfile,
        return &fence->base;
 }
 
-static int attach_dmabuf(struct drm_device *dev,
-                        struct drm_gem_object *obj)
-{
-       struct dma_buf *dmabuf;
-
-       if (obj->dma_buf)
-               return 0;
-
-       dmabuf = dev->driver->gem_prime_export(obj, 0);
-       if (IS_ERR(dmabuf))
-               return PTR_ERR(dmabuf);
-
-       obj->dma_buf = dmabuf;
-       return 0;
-}
-
 /*
  * vgem_fence_attach_ioctl (DRM_IOCTL_VGEM_FENCE_ATTACH):
  *
@@ -157,10 +141,6 @@ int vgem_fence_attach_ioctl(struct drm_device *dev,
        if (!obj)
                return -ENOENT;
 
-       ret = attach_dmabuf(dev, obj);
-       if (ret)
-               goto err;
-
        fence = vgem_fence_create(vfile, arg->flags);
        if (!fence) {
                ret = -ENOMEM;
@@ -168,7 +148,7 @@ int vgem_fence_attach_ioctl(struct drm_device *dev,
        }
 
        /* Check for a conflicting fence */
-       resv = obj->dma_buf->resv;
+       resv = obj->resv;
        if (!reservation_object_test_signaled_rcu(resv,
                                                  arg->flags & VGEM_FENCE_WRITE)) {
                ret = -EBUSY;