From: Johannes Berg <johan...@sipsolutions.net>
Date: Wed, 17 Jun 2015 13:54:54 +0200
> From: Johannes Berg <johannes.b...@intel.com>
>
> Unfortunately, Michal's change to fix AP_VLAN crypto tailroom
> caused a locking issue that was reported by lockdep, but only
> in a few cases - the issue was a classic ABBA deadlock caused
> by taking the mtx after the key_mtx, where normally they're
> taken the other way around.
>
> As the key mutex protects the field in question (I'm adding a
> few annotations to make that clear) only the iteration needs
> to be protected, but we can also iterate the interface list
> with just RCU protection while holding the key mutex.
>
> Fixes: f9dca80b98ca ("mac80211: fix AP_VLAN crypto tailroom calculation")
> Signed-off-by: Johannes Berg <johannes.b...@intel.com>
> ---
> Dave, if you're planning to send any more patches to Linus before
> the release, please apply this one. Otherwise let me know and I'll
> sort it out with Cc stable after the merge window.
Applied.
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