drm/i915: Fix struct mutex vs. RPS lock inversion
RPS lock must be taken before the struct_mutex to avoid locking inversion. So stop grabbing it for the whole powersave initialization and instead only take it during the sections which need it. Also, struct_mutex is not needed any more since dedicated RPS lock was added in: commit 4fc688ce Author: Jesse Barnes <jbarnes@virtuousgeek.org> Date: Fri Nov 2 11:14:01 2012 -0700 drm/i915: protect RPS/RC6 related accesses (including PCU) with a new mutex Based on prototype patch by Chris Wilson and a subsequent mailing list discussion involving Ville, Imre, Chris and Daniel. v2: More details in the commit. v3: Use drm_gem_object_unreference_unlocked. (Chris Wilson) Signed-off-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Imre Deak <imre.deak@intel.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: NChris Wilson <chris@chris-wilson.co.uk>
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