Re: [BUG] ide dma_timer_expiry, then hard lockup

Alan Cox wrote:

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  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...

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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 

    Yeah, that could be. And because IORDY pin becomes DSTROBE for UltraDMA it 
might have stuck low due to this (if the chip never asserted STOP)...

Alan

MBR, Sergei