drm/vc4: Wait for fences interruptibly in blocking mode.
We should allow SIGIO and things to interrupt us before we get to the no-error stage of the commit process. This code is effectively copied from drm_atomic_helper_commit(). Signed-off-by: NEric Anholt <eric@anholt.net> Link: http://patchwork.freedesktop.org/patch/msgid/20170621185002.28563-2-eric@anholt.netAcked-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: NBoris Brezillon <boris.brezillon@free-electrons.com>
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