drm/i915/execlists: Lock the request while validating it during promotion

	}

	for (port = execlists->pending; (rq = *port); port++) {

		unsigned long flags;

		bool ok = true;

		if (ce == rq->hw_context) {

			GEM_TRACE_ERR("Dup context:%llx in pending[%zd]\n",

				      ce->timeline->fence_context,

				      port - execlists->pending);

			return false;

		}

		ce = rq->hw_context;

		/* Hold tightly onto the lock to prevent concurrent retires! */

		spin_lock_irqsave_nested(&rq->lock, flags,

					 SINGLE_DEPTH_NESTING);

		if (i915_request_completed(rq))

			continue;

			goto unlock;

		if (i915_active_is_idle(&ce->active) &&

		    !i915_gem_context_is_kernel(ce->gem_context)) {

			GEM_TRACE_ERR("Inactive context:%llx in pending[%zd]\n",

				      ce->timeline->fence_context,

				      port - execlists->pending);

			return false;

			ok = false;

			goto unlock;

		}

		if (!i915_vma_is_pinned(ce->state)) {

			GEM_TRACE_ERR("Unpinned context:%llx in pending[%zd]\n",

				      ce->timeline->fence_context,

				      port - execlists->pending);

			return false;

			ok = false;

			goto unlock;

		}

		if (!i915_vma_is_pinned(ce->ring->vma)) {

			GEM_TRACE_ERR("Unpinned ring:%llx in pending[%zd]\n",

				      ce->timeline->fence_context,

				      port - execlists->pending);

			return false;

			ok = false;

			goto unlock;

		}

unlock:

		spin_unlock_irqrestore(&rq->lock, flags);

		if (!ok)

			return false;

	}

	return ce;