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drm: Fix locking cargo-cult in encoder/plane init/cleanup
Encoders&planes can't be hotplugged, we dont need locking for this since it's all single-threaded driver setup/teardown code. CRTCs already don't grab locks. While at it I noticed that plane's are missing the drm_modeset_lock_fini() call, so add it. Reviewed-by: Frank Binns <frank.binns@imgtec.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20161129094538.9650-1-daniel.vetter@ffwll.ch
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