Re: [BUG] ide dma_timer_expiry, then hard lockup

quoted

   Indeed... but the thing is we don't know what's asserted in this case 
-- remember, it's reading the status register that locks everything up...

Exactly.  And IORDY shouldn't really apply there,
unless some nitwit standards person wrote it into a spec..

Could it be we need to reset the state machine at this point before we
touch the registers again - that wouldn't be the first controller with
this limit and undocumented.

On the 370 we already 

Linas; For the debug on the libata one turn on ATA_DEBUG and
ATA_VERBOSE_DEBUG in include/linux/libata.h and it should spew
diagnostics before the freeze. I suspect thats a different problem to the
hang you see now but I'd like to debug both.

Alan