RDMA/rxe: Remove rxe_drop_all_macst_groups

With o10-2.2.3 enforced rxe_drop_all_mcast_groups is completely
unnecessary. Remove it and references to it.

Link: https://lore.kernel.org/r/20220127213755.31697-6-rpearsonhpe@gmail.comSigned-off-by: Bob Pearson <rpearsonhpe@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/rxe/rxe_loc.h

@@ -40,7 +40,6 @@ void rxe_cq_disable(struct rxe_cq *cq);
 void rxe_cq_cleanup(struct rxe_pool_elem *arg);
 
 /* rxe_mcast.c */
-void rxe_drop_all_mcast_groups(struct rxe_qp *qp);
 void rxe_mc_cleanup(struct rxe_pool_elem *arg);
 int rxe_attach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid);
 int rxe_detach_mcast(struct ib_qp *ibqp, union ib_gid *mgid, u16 mlid);

drivers/infiniband/sw/rxe/rxe_mcast.c

@@ -162,32 +162,6 @@ static int rxe_mcast_drop_grp_elem(struct rxe_dev *rxe, struct rxe_qp *qp,
 	return -EINVAL;
 }
 
-void rxe_drop_all_mcast_groups(struct rxe_qp *qp)
-{
-	struct rxe_mcg *grp;
-	struct rxe_mca *elem;
-
-	while (1) {
-		spin_lock_bh(&qp->grp_lock);
-		if (list_empty(&qp->grp_list)) {
-			spin_unlock_bh(&qp->grp_lock);
-			break;
-		}
-		elem = list_first_entry(&qp->grp_list, struct rxe_mca,
-					grp_list);
-		list_del(&elem->grp_list);
-		spin_unlock_bh(&qp->grp_lock);
-
-		grp = elem->grp;
-		spin_lock_bh(&grp->mcg_lock);
-		list_del(&elem->qp_list);
-		grp->num_qp--;
-		spin_unlock_bh(&grp->mcg_lock);
-		rxe_drop_ref(grp);
-		rxe_drop_ref(elem);
-	}
-}
-
 void rxe_mc_cleanup(struct rxe_pool_elem *elem)
 {
 	struct rxe_mcg *grp = container_of(elem, typeof(*grp), elem);

drivers/infiniband/sw/rxe/rxe_qp.c

@@ -812,8 +812,6 @@ static void rxe_qp_do_cleanup(struct work_struct *work)
 {
 	struct rxe_qp *qp = container_of(work, typeof(*qp), cleanup_work.work);
 
-	rxe_drop_all_mcast_groups(qp);
-
 	if (qp->sq.queue)
 		rxe_queue_cleanup(qp->sq.queue);