diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index ad5bab6a44b6..c0a228def6da 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -386,7 +386,7 @@ static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
 	INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
 	INIT_LIST_HEAD(&smc->accept_q);
 	spin_lock_init(&smc->accept_q_lock);
-	spin_lock_init(&smc->conn.send_lock);
+	mutex_init(&smc->conn.send_lock);
 	sk->sk_prot->hash(sk);
 	mutex_init(&smc->clcsock_release_lock);
 	smc_init_saved_callbacks(smc);
diff --git a/net/smc/smc.h b/net/smc/smc.h
index 18c8b7870198..ba8efed240e3 100644
--- a/net/smc/smc.h
+++ b/net/smc/smc.h
@@ -194,7 +194,7 @@ struct smc_connection {
 	atomic_t		sndbuf_space;	/* remaining space in sndbuf */
 	u16			tx_cdc_seq;	/* sequence # for CDC send */
 	u16			tx_cdc_seq_fin;	/* sequence # - tx completed */
-	spinlock_t		send_lock;	/* protect wr_sends */
+	struct mutex		send_lock;	/* protect wr_sends */
 	atomic_t		cdc_pend_tx_wr; /* number of pending tx CDC wqe
 						 * - inc when post wqe,
 						 * - dec on polled tx cqe
diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c
index 3c06625ceb20..f8ad0035905a 100644
--- a/net/smc/smc_cdc.c
+++ b/net/smc/smc_cdc.c
@@ -186,10 +186,10 @@ static int smcr_cdc_get_slot_and_msg_send(struct smc_connection *conn)
 	if (rc)
 		goto put_out;
 
-	spin_lock_bh(&conn->send_lock);
+	mutex_lock(&conn->send_lock);
 	if (link != conn->lnk) {
 		/* link of connection changed, try again one time*/
-		spin_unlock_bh(&conn->send_lock);
+		mutex_unlock(&conn->send_lock);
 		smc_wr_tx_put_slot(link,
 				   (struct smc_wr_tx_pend_priv *)pend);
 		smc_wr_tx_link_put(link);
@@ -199,7 +199,7 @@ static int smcr_cdc_get_slot_and_msg_send(struct smc_connection *conn)
 		goto again;
 	}
 	rc = smc_cdc_msg_send(conn, wr_buf, pend);
-	spin_unlock_bh(&conn->send_lock);
+	mutex_unlock(&conn->send_lock);
 put_out:
 	smc_wr_tx_link_put(link);
 	return rc;
@@ -214,9 +214,9 @@ int smc_cdc_get_slot_and_msg_send(struct smc_connection *conn)
 		return -EPIPE;
 
 	if (conn->lgr->is_smcd) {
-		spin_lock_bh(&conn->send_lock);
+		mutex_lock(&conn->send_lock);
 		rc = smcd_cdc_msg_send(conn);
-		spin_unlock_bh(&conn->send_lock);
+		mutex_unlock(&conn->send_lock);
 	} else {
 		rc = smcr_cdc_get_slot_and_msg_send(conn);
 	}
@@ -308,10 +308,10 @@ static void smc_cdc_msg_validate(struct smc_sock *smc, struct smc_cdc_msg *cdc,
 	if (diff < 0) { /* diff larger than 0x7fff */
 		/* drop connection */
 		conn->out_of_sync = 1;	/* prevent any further receives */
-		spin_lock_bh(&conn->send_lock);
+		mutex_lock(&conn->send_lock);
 		conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
 		conn->lnk = link;
-		spin_unlock_bh(&conn->send_lock);
+		mutex_unlock(&conn->send_lock);
 		sock_hold(&smc->sk); /* sock_put in abort_work */
 		if (!queue_work(smc_close_wq, &conn->abort_work))
 			sock_put(&smc->sk);
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index 9b84d5897aa5..21e0d95ab8c8 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -1083,9 +1083,9 @@ struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
 		    smc->sk.sk_state == SMC_PEERFINCLOSEWAIT ||
 		    smc->sk.sk_state == SMC_PEERABORTWAIT ||
 		    smc->sk.sk_state == SMC_PROCESSABORT) {
-			spin_lock_bh(&conn->send_lock);
+			mutex_lock(&conn->send_lock);
 			smc_switch_link_and_count(conn, to_lnk);
-			spin_unlock_bh(&conn->send_lock);
+			mutex_unlock(&conn->send_lock);
 			continue;
 		}
 		sock_hold(&smc->sk);
@@ -1095,10 +1095,10 @@ struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
 		if (rc)
 			goto err_out;
 		/* avoid race with smcr_tx_sndbuf_nonempty() */
-		spin_lock_bh(&conn->send_lock);
+		mutex_lock(&conn->send_lock);
 		smc_switch_link_and_count(conn, to_lnk);
 		rc = smc_switch_cursor(smc, pend, wr_buf);
-		spin_unlock_bh(&conn->send_lock);
+		mutex_unlock(&conn->send_lock);
 		sock_put(&smc->sk);
 		if (rc)
 			goto err_out;
diff --git a/net/smc/smc_tx.c b/net/smc/smc_tx.c
index 214ac3cbcf9a..b6790bd82b4e 100644
--- a/net/smc/smc_tx.c
+++ b/net/smc/smc_tx.c
@@ -573,7 +573,7 @@ static int smcr_tx_sndbuf_nonempty(struct smc_connection *conn)
 		return rc;
 	}
 
-	spin_lock_bh(&conn->send_lock);
+	mutex_lock(&conn->send_lock);
 	if (link != conn->lnk) {
 		/* link of connection changed, tx_work will restart */
 		smc_wr_tx_put_slot(link,
@@ -597,7 +597,7 @@ static int smcr_tx_sndbuf_nonempty(struct smc_connection *conn)
 	}
 
 out_unlock:
-	spin_unlock_bh(&conn->send_lock);
+	mutex_unlock(&conn->send_lock);
 	smc_wr_tx_link_put(link);
 	return rc;
 }
@@ -607,7 +607,7 @@ static int smcd_tx_sndbuf_nonempty(struct smc_connection *conn)
 	struct smc_cdc_producer_flags *pflags = &conn->local_tx_ctrl.prod_flags;
 	int rc = 0;
 
-	spin_lock_bh(&conn->send_lock);
+	mutex_lock(&conn->send_lock);
 	if (!pflags->urg_data_present)
 		rc = smc_tx_rdma_writes(conn, NULL);
 	if (!rc)
@@ -617,7 +617,7 @@ static int smcd_tx_sndbuf_nonempty(struct smc_connection *conn)
 		pflags->urg_data_pending = 0;
 		pflags->urg_data_present = 0;
 	}
-	spin_unlock_bh(&conn->send_lock);
+	mutex_unlock(&conn->send_lock);
 	return rc;
 }
 
