scst: Queue tgt_dev free work on system_long_wq

scst_free_tgt_dev() waits until pending I/O commands have finished and hence
can take a while.


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@8487 d57e44dd-8a1f-0410-8b47-8ef2f437770f

scst/src/scst_lib.c

@@ -4584,7 +4584,11 @@ void scst_free_tgt_dev_rcu(struct rcu_head *rcu)
 
 	tgt_dev->a = scst_get();
 	percpu_ref_get(&tgt_dev->dev->refcnt);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
 	WARN_ON_ONCE(!schedule_work(&tgt_dev->free_work));
+#else
+	WARN_ON_ONCE(!queue_work(system_long_wq, &tgt_dev->free_work));
+#endif
 }
 
 /* Delete a LUN without generating a unit attention. */