Re: bridge/netfilter: regression in 2.6.39.1

Hello,

Am 04.06.2011 14:04, schrieb Alexander Holler:

Anyway, I've used the broken way of not using git send-email because I'm
unsure if the solution I've offered is the best one. I'm lacking the
knowledge about what cow_metrics() does, what it is used for, and what,
if any, pre- or post-requisites are needed to use
dst_cow_metrics_generic().

I can only say that my solution seems to work here, the machine comes up
without an oops and I didn't have seen any other problems while using
the bridge (which surely doesn't say anything, e.g. I'm not sure if my
use of dst_cow_metrics_generic() may introduce a mem leak or similiar,
it doesn't look so, but who knows).

After having a second look at dst_cow_metrics_generic(), it seems my 
patch does introduce a small mem leak which occurs when the bridge will 
be build as a module and the module gets unloaded. Then the static 
struct dst_ops fake_dst_ops disappears and with that the memory 
allocated by dst_cow_metrics_generic() is lost. I'm not sure which of 
the dst*-functions should be called before the module gets unloaded. 
Maybe someone with a deeper knowledge of the that stuff could have a 
look at that.
Or maybe just changing the true in the call to dst_cow_metrics_generic() 
in br_netfilter_rtable_init() to false instead of adding 
dst_cow_metrics_generic() to fake_dst_ops() is an alternative. As I 
said, I don't know what that metric-stuff does and what it is used for.

Regards,

Alexander