Target/iser: Wait for proper cleanup before unloading

commit f5ebec96 upstream.

disconnected_handler works are scheduled on system_wq.
When attempting to unload, first make sure all works
have cleaned up.
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/infiniband/ulp/isert/ib_isert.c

@@ -2332,6 +2332,7 @@ static int __init isert_init(void)
 
 static void __exit isert_exit(void)
 {
+	flush_scheduled_work();
 	kmem_cache_destroy(isert_cmd_cache);
 	destroy_workqueue(isert_comp_wq);
 	destroy_workqueue(isert_rx_wq);