net/smc: check for pending termination

Avoid to run the processing in smc_lgr_terminate() more than once,
remember when the link group termination is triggered.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/smc/smc_clc.c

@@ -316,7 +316,7 @@ int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen,
 	if (clcm->type == SMC_CLC_DECLINE) {
 		reason_code = SMC_CLC_DECL_REPLY;
 		if (((struct smc_clc_msg_decline *)buf)->hdr.flag) {
-			smc->conn.lgr->sync_err = true;
+			smc->conn.lgr->sync_err = 1;
 			smc_lgr_terminate(smc->conn.lgr);
 		}
 	}

net/smc/smc_core.c

@@ -172,7 +172,7 @@ static int smc_lgr_create(struct smc_sock *smc,
 		goto out;
 	}
 	lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
-	lgr->sync_err = false;
+	lgr->sync_err = 0;
 	memcpy(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN);
 	lgr->vlan_id = vlan_id;
 	rwlock_init(&lgr->sndbufs_lock);
@@ -352,6 +352,9 @@ void smc_lgr_terminate(struct smc_link_group *lgr)
 	struct smc_sock *smc;
 	struct rb_node *node;
 
+	if (lgr->terminating)
+		return;	/* lgr already terminating */
+	lgr->terminating = 1;
 	smc_lgr_forget(lgr);
 	smc_llc_link_inactive(&lgr->lnk[SMC_SINGLE_LINK]);
 

net/smc/smc_core.h

@@ -166,7 +166,8 @@ struct smc_link_group {
 
 	u8			id[SMC_LGR_ID_SIZE];	/* unique lgr id */
 	struct delayed_work	free_work;	/* delayed freeing of an lgr */
-	bool			sync_err;	/* lgr no longer fits to peer */
+	u8			sync_err : 1;	/* lgr no longer fits to peer */
+	u8			terminating : 1;/* lgr is terminating */
 };
 
 /* Find the connection associated with the given alert token in the link group.