fcst: Add an rcu_barrier() call

fcst uses call_rcu() hence rcu_barrier() must be called before module
unloading finishes.

Fixes: 6023f1ad34 ("This patch adds a new target module for SCST and libfc that accepts FCP requests from libfc HBAs running Fibre Channel over Ethernet (FCoE) and passes them to SCST.") # v3.0.0 (r1514).



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@8019 d57e44dd-8a1f-0410-8b47-8ef2f437770f

fcst/ft_scst.c

@@ -72,6 +72,8 @@ static int __init ft_module_init(void)
 
 static void __exit ft_module_exit(void)
 {
+	rcu_barrier();
+
 	blocking_notifier_chain_unregister(&fc_lport_notifier_head,
 					   &ft_notifier);
 	fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov);