Comment 101 for bug 1066435

Created attachment 360882
drivers/i2c/busses/i2c-powermac.c commit log

Hmm, sorry, the commit is too big for an out-stander to understand what really is going on and what the possible issue might be.

==> Can you try =sys-kernel/git-sources-3.12-rc5? <==

It contains a commit that might outline the problem better:

commit 874e955b171f0505e2371c1ca80a2188efdc217d
Author: Wolfram Sang <email address hidden>
Date: Thu Jul 11 22:02:03 2013 +0100

    i2c: powermac: fix return path on error

    We want to bail out immediately if i2c_add_adapter failed and not try to
    register child nodes with a nilled adapter structure.

    Signed-off-by: Wolfram Sang <email address hidden>

And possibly some other fixes (see attachment).