LU-12739 lnet: Don't queue msg when discovery has completed

[fs/lustre-release.git] / lnet / lnet / lib-move.c

diff --git a/lnet/lnet/lib-move.c b/lnet/lnet/lib-move.c
index 1706ef7..88f20e7 100644 (file)
--- a/lnet/lnet/lib-move.c
+++ b/lnet/lnet/lib-move.c
@@ -2009,15 +2009,21 @@ lnet_initiate_peer_discovery(struct lnet_peer_ni *lpni,
        }
        /* The peer may have changed. */
        peer = lpni->lpni_peer_net->lpn_peer;
+       spin_lock(&peer->lp_lock);
+       if (lnet_peer_is_uptodate_locked(peer)) {
+               spin_unlock(&peer->lp_lock);
+               lnet_peer_ni_decref_locked(lpni);
+               return 0;
+       }
        /* queue message and return */
        msg->msg_rtr_nid_param = rtr_nid;
        msg->msg_sending = 0;
        msg->msg_txpeer = NULL;
-       spin_lock(&peer->lp_lock);
        list_add_tail(&msg->msg_list, &peer->lp_dc_pendq);
+       primary_nid = peer->lp_primary_nid;
        spin_unlock(&peer->lp_lock);
+
        lnet_peer_ni_decref_locked(lpni);
-       primary_nid = peer->lp_primary_nid;
 
        CDEBUG(D_NET, "msg %p delayed. %s pending discovery\n",
                msg, libcfs_nid2str(primary_nid));
@@ -2671,11 +2677,10 @@ again:
        msg->msg_src_nid_param = src_nid;
 
        /*
-        * Now that we have a peer_ni, check if we want to discover
-        * the peer. Traffic to the LNET_RESERVED_PORTAL should not
-        * trigger discovery.
+        * If necessary, perform discovery on the peer that owns this peer_ni.
+        * Note, this can result in the ownership of this peer_ni changing
+        * to another peer object.
         */
-       peer = lpni->lpni_peer_net->lpn_peer;
        rc = lnet_initiate_peer_discovery(lpni, msg, rtr_nid, cpt);
        if (rc) {
                lnet_peer_ni_decref_locked(lpni);
@@ -2684,6 +2689,8 @@ again:
        }
        lnet_peer_ni_decref_locked(lpni);
 
+       peer = lpni->lpni_peer_net->lpn_peer;
+
        /*
         * Identify the different send cases
         */