drm/i915: Hold onto an explicit ref to i915_vma_work.pinned

Since __vma_release is run by a kworker after the fence has been
signaled, it is no longer protected by the active reference on the vma,
and so the alias of vw->pinned to vma->obj is also not protected by a
reference on the object. Add an explicit reference for vw->pinned so it
will always be safe.

Found by inspection.

Fixes: 54d7195f8c64 ("drm/i915: Unpin vma->obj on early error")
Reported-by: Tvrtko Ursulin <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: <[email protected]> # v5.6+
Reviewed-by: Tvrtko Ursulin <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

0 files changed, 0 insertions, 0 deletions