ipmi:msghandler: Shut down lower layer first at unregister

This makes sure any outstanding messages are returned to the user before
the interface is cleaned up.

Signed-off-by: Corey Minyard <cminyard@mvista.com>

Author: cminyard

drivers/char/ipmi/ipmi_msghandler.c

@@ -3738,7 +3738,13 @@ void ipmi_unregister_smi(struct ipmi_smi *intf)
 	list_del(&intf->link);
 	mutex_unlock(&ipmi_interfaces_mutex);
 
-	/* At this point no users can be added to the interface. */
+	/*
+	 * At this point no users can be added to the interface and no
+	 * new messages can be sent.
+	 */
+
+	if (intf->handlers->shutdown)
+		intf->handlers->shutdown(intf->send_info);
 
 	device_remove_file(intf->si_dev, &intf->nr_msgs_devattr);
 	device_remove_file(intf->si_dev, &intf->nr_users_devattr);
@@ -3761,9 +3767,6 @@ void ipmi_unregister_smi(struct ipmi_smi *intf)
 	}
 	mutex_unlock(&intf->users_mutex);
 
-	if (intf->handlers->shutdown)
-		intf->handlers->shutdown(intf->send_info);
-
 	cleanup_smi_msgs(intf);
 
 	ipmi_bmc_unregister(intf);