[J,2/3] net/smc: keep static copy of system EID

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 2ded836aca80..3760c39543d5 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1719,7 +1719,7 @@  static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
 	if (!ini->ism_dev[0])
 		goto not_found;
 
-	smc_ism_get_system_eid(ini->ism_dev[0], &eid);
+	smc_ism_get_system_eid(&eid);
 	if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext,
 			       smcd_v2_ext->system_eid, eid))
 		goto not_found;
diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
index bcbd1c4a5802..110c2ef45a3f 100644
--- a/net/smc/smc_clc.c
+++ b/net/smc/smc_clc.c
@@ -797,10 +797,7 @@  int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini)
 				offsetofend(struct smc_clnt_opts_area_hdr,
 					    smcd_v2_ext_offset) +
 				v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN);
-		if (ini->ism_dev[0])
-			smc_ism_get_system_eid(ini->ism_dev[0], &eid);
-		else
-			smc_ism_get_system_eid(ini->ism_dev[1], &eid);
+		smc_ism_get_system_eid(&eid);
 		if (eid && v2_ext->hdr.flag.seid)
 			memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN);
 		plen += sizeof(*v2_ext) + sizeof(*smcd_v2_ext);
diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c
index dee336eef6d2..a9878996ceea 100644
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -225,7 +225,6 @@  int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
 	struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 	char hostname[SMC_MAX_HOSTNAME_LEN + 1];
 	char smc_seid[SMC_MAX_EID_LEN + 1];
-	struct smcd_dev *smcd_dev;
 	struct nlattr *attrs;
 	u8 *seid = NULL;
 	u8 *host = NULL;
@@ -254,13 +253,8 @@  int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
 		if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname))
 			goto errattr;
 	}
-	mutex_lock(&smcd_dev_list.mutex);
-	smcd_dev = list_first_entry_or_null(&smcd_dev_list.list,
-					    struct smcd_dev, list);
-	if (smcd_dev)
-		smc_ism_get_system_eid(smcd_dev, &seid);
-	mutex_unlock(&smcd_dev_list.mutex);
-	if (seid && smc_ism_is_v2_capable()) {
+	if (smc_ism_is_v2_capable()) {
+		smc_ism_get_system_eid(&seid);
 		memcpy(smc_seid, seid, SMC_MAX_EID_LEN);
 		smc_seid[SMC_MAX_EID_LEN] = 0;
 		if (nla_put_string(skb, SMC_NLA_SYS_SEID, smc_seid))
diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c
index 9cb2df289963..fd28cc498b98 100644
--- a/net/smc/smc_ism.c
+++ b/net/smc/smc_ism.c
@@ -23,6 +23,7 @@  struct smcd_dev_list smcd_dev_list = {
 };
 
 static bool smc_ism_v2_capable;
+static u8 smc_ism_v2_system_eid[SMC_MAX_EID_LEN];
 
 /* Test if an ISM communication is possible - same CPC */
 int smc_ism_cantalk(u64 peer_gid, unsigned short vlan_id, struct smcd_dev *smcd)
@@ -42,9 +43,12 @@  int smc_ism_write(struct smcd_dev *smcd, const struct smc_ism_position *pos,
 	return rc < 0 ? rc : 0;
 }
 
-void smc_ism_get_system_eid(struct smcd_dev *smcd, u8 **eid)
+void smc_ism_get_system_eid(u8 **eid)
 {
-	smcd->ops->get_system_eid(smcd, eid);
+	if (!smc_ism_v2_capable)
+		*eid = NULL;
+	else
+		*eid = smc_ism_v2_system_eid;
 }
 
 u16 smc_ism_get_chid(struct smcd_dev *smcd)
@@ -435,9 +439,12 @@  int smcd_register_dev(struct smcd_dev *smcd)
 	if (list_empty(&smcd_dev_list.list)) {
 		u8 *system_eid = NULL;
 
-		smc_ism_get_system_eid(smcd, &system_eid);
-		if (system_eid[24] != '0' || system_eid[28] != '0')
+		smcd->ops->get_system_eid(smcd, &system_eid);
+		if (system_eid[24] != '0' || system_eid[28] != '0') {
 			smc_ism_v2_capable = true;
+			memcpy(smc_ism_v2_system_eid, system_eid,
+			       SMC_MAX_EID_LEN);
+		}
 	}
 	/* sort list: devices without pnetid before devices with pnetid */
 	if (smcd->pnetid[0])
@@ -533,4 +540,5 @@  EXPORT_SYMBOL_GPL(smcd_handle_irq);
 void __init smc_ism_init(void)
 {
 	smc_ism_v2_capable = false;
+	memset(smc_ism_v2_system_eid, 0, SMC_MAX_EID_LEN);
 }
diff --git a/net/smc/smc_ism.h b/net/smc/smc_ism.h
index 113efc7352ed..004b22a13ffa 100644
--- a/net/smc/smc_ism.h
+++ b/net/smc/smc_ism.h
@@ -48,7 +48,7 @@  int smc_ism_unregister_dmb(struct smcd_dev *dev, struct smc_buf_desc *dmb_desc);
 int smc_ism_write(struct smcd_dev *dev, const struct smc_ism_position *pos,
 		  void *data, size_t len);
 int smc_ism_signal_shutdown(struct smc_link_group *lgr);
-void smc_ism_get_system_eid(struct smcd_dev *dev, u8 **eid);
+void smc_ism_get_system_eid(u8 **eid);
 u16 smc_ism_get_chid(struct smcd_dev *dev);
 bool smc_ism_is_v2_capable(void);
 void smc_ism_init(void);