greybus: interface: send deactivate prepare when interface is disabled

The AP Interface shall exchange a Greybus Control Interface Deactivate
Prepare Operation with the Interface being powered down.

Testing Done:
 - Check for the return code after sending the deactivate prepare operation

Signed-off-by: David Lin <dtwlin@google.com>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Alex Elder <elder@linaro.org>

diff --git a/drivers/staging/greybus/interface.c b/drivers/staging/greybus/interface.c
index 2290a9c3ff9a93df109a8dcae77256a500156209..e7efc541895a3ddd8abb48e6df38392b59d12750 100644 (file)
--- a/drivers/staging/greybus/interface.c
+++ b/drivers/staging/greybus/interface.c
@@ -861,6 +861,9 @@ void gb_interface_disable(struct gb_interface *intf)
        list_for_each_entry_safe(bundle, next, &intf->bundles, links)
                gb_bundle_destroy(bundle);
 
+       if (!intf->mode_switch && !intf->disconnected)
+               gb_control_interface_deactivate_prepare(intf->control);
+
        gb_timesync_interface_remove(intf);
        gb_control_del(intf->control);
        gb_control_disable(intf->control);