[PATCH 6/9] drm/nouveau: Convert event handler list to RCU

Lockdep report [1] correctly identifies a potential deadlock between nouveau_drm_vblank_enable() and nouveau_drm_vblank_handler() due to inverted lock order of event->lock with drm core's dev->vblank_time_lock. Fix vblank event deadlock by converting event handler list to RCU. List updates remain

[PATCH 6/9] drm/nouveau: Convert event handler list to RCU

Lockdep report [1] correctly identifies a potential deadlock between nouveau_drm_vblank_enable() and nouveau_drm_vblank_handler() due to inverted lock order of event->lock with drm core's dev->vblank_time_lock. Fix vblank event deadlock by converting event handler list to RCU. List updates remain