[PATCH 12/69] drm/i915: No longer allow exporting userptr through dma-buf

[Maarten Lankhorst]

It doesn't make sense to export a memory address, we will prevent
allowing access this way to different address spaces when we
rework userptr handling, so best to explicitly disable it.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Cc: Jason Ekstrand <jason at jlekstrand.net>

-- Still needs an ack from relevant userspace that it won't break, but should be good.
---
 drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
index 5a19699c2d7e..0c30ca52dee3 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
@@ -694,10 +694,9 @@ i915_gem_userptr_release(struct drm_i915_gem_object *obj)
 static int
 i915_gem_userptr_dmabuf_export(struct drm_i915_gem_object *obj)
 {
-	if (obj->userptr.mmu_object)
-		return 0;
+	drm_dbg(obj->base.dev, "Exporting userptr no longer allowed\n");
 
-	return i915_gem_userptr_init__mmu_notifier(obj, 0);
+	return -EINVAL;
 }
 
 static int
-- 
2.30.1