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Need to drm_vblank_get/put() the crtc involved in a pending pageflip, or we might not get vblank irqs and updates of vblank counts and timestamps for pageflip events and flip completion. Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com> Signed-off-by: Ben Skeggs <bskeggs@redhat.com> Cc: stable@vger.kernel.org