diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index e84241ff4ac4..ab9ecdd1af0a 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -1101,6 +1101,7 @@ void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
 {
 	struct smc_link_group *lgr, *n;
 
+	spin_lock_bh(&smc_lgr_list.lock);
 	list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
 		struct smc_link *link;
 
@@ -1115,6 +1116,7 @@ void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
 		if (link)
 			smc_llc_add_link_local(link);
 	}
+	spin_unlock_bh(&smc_lgr_list.lock);
 }
 
 /* link is down - switch connections to alternate link,