Remove __attribute__((__aligned__)) that generates incorrect alignment on compilers that know about SSE.  Code left over from old header that thought that 64 bits was the maximum alignment that anything would ever need...
Remove droping topology mutex after iterating 100 periphs in CAMGETPASSTHRU.
That is not so slow and so often operation to handle unneeded otherwise
xsoftc.xpt_generation and respective locking complications.