net/smc: fix SMCD link group creation with VLAN id

If creation of an SMCD link group with VLAN id fails, the initial
smc_ism_get_vlan() step has to be reverted as well.

Fixes: c6ba7c9b ("net/smc: add base infrastructure for SMC-D and ISM")
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

net/smc/smc_core.c

@@ -213,7 +213,7 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
 	lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
 	if (!lgr) {
 		rc = SMC_CLC_DECL_MEM;
-		goto out;
+		goto ism_put_vlan;
 	}
 	lgr->is_smcd = ini->is_smcd;
 	lgr->sync_err = 0;
@@ -289,6 +289,9 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
 	smc_llc_link_clear(lnk);
 free_lgr:
 	kfree(lgr);
+ism_put_vlan:
+	if (ini->is_smcd && ini->vlan_id)
+		smc_ism_put_vlan(ini->ism_dev, ini->vlan_id);
 out:
 	if (rc < 0) {
 		if (rc == -ENOMEM)