drm: extract legacy ctxbitmap flushing
The ctxbitmap code is only used by legacy drivers so lets try to keep it as separated as possible. Furthermore, the locking is non-obvious and kinda weird with ctxlist_mutex *and* struct_mutex. Keeping all ctxbitmap access in one file is much easier to review and makes drm_release() more readable. Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: NDavid Herrmann <dh.herrmann@gmail.com>
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