drm/ast: invalidate page tables when pinning a BO
commit 3ac65259328324de323dc006b52ff7c1a5b18d19 upstream. same fix as cirrus and mgag200. Signed-off-by:Dave Airlie <airlied@redhat.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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