net/smc: convert static link ID instances to support multiple links

As a preparation for the support of multiple links remove the usage of
a static link id (SMC_SINGLE_LINK) and allow dynamic link ids.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/smc/smc_llc.c

@@ -662,6 +662,8 @@ void smc_llc_link_deleting(struct smc_link *link)
 /* called in tasklet context */
 void smc_llc_link_inactive(struct smc_link *link)
 {
+	if (link->state == SMC_LNK_INACTIVE)
+		return;
 	link->state = SMC_LNK_INACTIVE;
 	cancel_delayed_work(&link->llc_testlink_wrk);
 	smc_wr_wakeup_reg_wait(link);