FSL serial 166550 errata broken?

[Joakim Tjernlund]

We got some "broken" boards(mpx8321) where UART RX is held low(BREAK)
There we get a few:
  serial8250: too much work for irq18
and the board freezes.

Looking inte to driver/CPU there is an errtum(A-004737) w.r.t BREAK handling
and I can see we are hitting the irq function fsl8250_handle_irq() added
in commit: 9deaa53ac7fa373623123aa4f18828dd62292b1a
 "serial: add irq handler for Freescale 16550 errata."
For all I can tell this workaround is broken and I cannot figure out why.
Any pointers?

 Jocke