Hi,
Here are five fixes which address potential problems with parallel OGM processing. For the multicast subsystem the issues can be quite severe as found and pointed out by Sven here [0].
Cheers, Linus
[0]: https://lists.open-mesh.org/pipermail/b.a.t.m.a.n/2015-June/013193.html
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Changelog v4:
* [PATCHv4 maint 5/5]: * Shortened if...BUG() to BUG_ON()
Changelog v3:
* [PATCHv3 maint 5/5]: * added kerneldoc for new mcast_handler_lock in types.h
Changelog v2:
* Split [PATCH maint 1/2] into [PATCHv2 {1,2,3,4}/5] * [PATCHv2 maint 5/5]: * moved mcast_flags initialization outside of spinlock * added spinlock in batadv_mcast_purge_orig() (not strictly necessary bc. if we are here then the orig-node is out-of-scope as it's going to be kfree'd a few instructions later - but added for style reasons / to avoid future errors) * added hlist_unhashed()+BUG() calls (again, shouldn't be necessary as the checks and new spinlock should avoid this case. But since the safety of hlist_del_rcu() isn't directly obvious, better adding these annotations and to avoid future regressions with kernel panics)
PS: Thanks to Marek for the suggestions.