IDE floppy is broken in 2.5.2 & 2.5.3-pre1.
More specifically, it oops/BUG_ON at the driver initialization
because the additional check made in elevator_linus_add_request()
between 2.5.2-pre11 and 2.5.2-final.
Further investigation is on the way.
--
Luc Van Oostenryck