rxe: fix broken receive queue draining

If we modified the qp to ERROR state, and
drained the recieve queue, post_recv must
trigger the responder task to complete
the drain work request.

Cc: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: NVijay Immanuel <vijayi@attalasystems.com>
Signed-off-by: NSagi Grimberg <sagi@grimberg.me>
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>--
Signed-off-by: NDoug Ledford <dledford@redhat.com>

drivers/infiniband/sw/rxe/rxe_resp.c

@@ -1219,6 +1219,9 @@ void rxe_drain_req_pkts(struct rxe_qp *qp, bool notify)
 		kfree_skb(skb);
 	}
 
+	if (notify)
+		return;
+
 	while (!qp->srq && qp->rq.queue && queue_head(qp->rq.queue))
 		advance_consumer(qp->rq.queue);
 }

drivers/infiniband/sw/rxe/rxe_verbs.c

@@ -914,6 +914,9 @@ static int rxe_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
 
 	spin_unlock_irqrestore(&rq->producer_lock, flags);
 
+	if (qp->resp.state == QP_STATE_ERROR)
+		rxe_run_task(&qp->resp.task, 1);
+
 err1:
 	return err;
 }