On Wed, 2009-08-26 at 13:33 +0000, Hin-Tak Leung wrote: > > Or wait ... are you using compat-wireless? > > Yes, I am. I mentioned this and did wonder if the _backport/ part > in /sys/class is important. Sorry, didn't see. Anyway, that's pretty clearly the reason -- Luis added NETDEV_PRE_UP to some compat*.h but obviously the kernel won't ever call that notifier, so cfg80211 doesn't get a chance to reject the IFUP. No idea how to handle that -- it'll be working fine in a regular tree. Luis, the only way to handle that would be to manually call the PRE_UP notifier from mac80211's subif_open() and if that returns an error (warning: the calling convention is weird) return the error... that's weird but would work. johannes
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