greybus: connection: verify disabled when destroyed

A connection must be in DISABLED state before it gets destroyed.
Warn if this is ever not the case (and do the disconnect) before
proceeding with connection destruction.

Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/connection.c

@@ -660,6 +660,9 @@ void gb_connection_destroy(struct gb_connection *connection)
 	if (!connection)
 		return;
 
+	if (WARN_ON(connection->state != GB_CONNECTION_STATE_DISABLED))
+		gb_connection_disable(connection);
+
 	mutex_lock(&gb_connection_mutex);
 
 	spin_lock_irq(&gb_connections_lock);