[Bug 98829] [BDW] oops in intel_unpin_fb_obj

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98829

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
120 bytes should be vma->vm i.e. the
lockdep_assert_held(&vma->vm->dev->struct_mutex), and so vma is NULL.

Given the persistence of GGTT vma (they are only destroyed when the object is)
it seems more likely that there was another change of state. Still that
loophole is closed by https://patchwork.freedesktop.org/series/15325/

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