[OpenWrt-Devel] OpenWrt cfg80211.h station_info incompatibility with kernel+mac80211 [was: B.A.T.M.A.N. V leaves the nest v2]
nbd at openwrt.org
Thu Jan 21 08:55:01 EST 2016
On 2016-01-21 14:47, Sven Eckelmann wrote:
> On Thursday 21 January 2016 12:56:01 Sven Eckelmann wrote:
>> Just installed in on some hardware (2x OM5P + OpenWrt 44654 + compat-wireless
>> 2015-10-26) and enabled BATMAN_V.
>> [ 168.540000] CPU 0 Unable to handle kernel paging request at virtual address fffffff0, epc == 86d8301c, ra == 86d8301c
>> [ 168.550000] Oops[#1]:
>> [ 168.550000] CPU: 0 PID: 265 Comm: kworker/u2:2 Tainted: P 3.18.8 #1
>> [ 168.550000] Workqueue: bat_events batadv_v_elp_throughput_metric_update [batman_adv]
>> [ 168.550000] epc : 86d8301c batadv_v_elp_throughput_metric_update+0x20/0x58 [batman_adv]
>> [ 168.550000] Tainted: P
>> [ 168.550000] ra : 86d8301c batadv_v_elp_throughput_metric_update+0x20/0x58 [batman_adv]
> Who knew that struct station_info changed in v3.18-6219-g6de3980,
> v3.18-6235-gb51f3be and v3.18-6217-ga76b194? Wieder keiner!? :)
> So what basically happened was a stack corruption causing the return address
> to be bogus. This only happened because the kernel version of cfg80211.h (which
> is used to compile batman-adv) is different than the version in the mac80211
> package (which is used at runtime) I have now synced that structure between the
> OpenWrt kernel and the used compat-wireless, rebuild my OpenWrt and tried again.
> I hope this helps anyone trying to use B.A.T.M.A.N. V on OpenWrt.
> @Felix, would it be ok for you when I propose a
> "*-sync-cfg80211-station_info.patch" for the 3.18 generic kernel patches?
> Or do you have a good idea how to force the openwrt-routing batman-adv package
> against the cfg80211.h of compat-wireless?
The openwrt mac80211 package exports its headers to
You could just make the batman-adv package use those includes.
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