drm/i915: Use appropriate spinlock flavour

		i915_gem_retire_requests_ring(ring);

		idle &= list_empty(&ring->request_list);

		if (i915.enable_execlists) {

			unsigned long flags;

			spin_lock_irqsave(&ring->execlist_lock, flags);

			spin_lock_irq(&ring->execlist_lock);

			idle &= list_empty(&ring->execlist_queue);

			spin_unlock_irqrestore(&ring->execlist_lock, flags);

			spin_unlock_irq(&ring->execlist_lock);

			intel_execlists_retire_requests(ring);

		}