drm/fb-helper: Push locking in fb_is_bound
That function only needs to take the individual crtc locks, not all the kms locks. Push down the locking and then minimize it. Cc: John Stultz <john.stultz@linaro.org> Cc: Thierry Reding <treding@nvidia.com> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170704151833.17304-5-daniel.vetter@ffwll.ch
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