On Sat, 2019-09-28 at 16:48 +0000, Taehee Yoo wrote: > virt_wifi_newlink() calls netdev_upper_dev_link() and it internally > holds reference count of lower interface. [...] > This patch adds notifier routine to delete upper interface before deleting > lower interface. Good catch, thanks! For now I'll assume this will go in through net together with the whole series (once ready), shout if you want something else. johannes