Re: [BUG] ide dma_timer_expiry, then hard lockup

Mark Lord wrote:

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I can prepare a patch, but only with a lot of guidance. I can test 
& debug, I'm highly motivated just right now ... 

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If you've got a nice repeatable problem please try using the libata
driver. That handles the error paths differently and doesn't try a 
FIFO
drain which might matter in this case I guess.

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   FIFO drain for DMA commands?

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Welcome to the old IDE layer which I am so glad I left behind 8)

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ide_ata_error will try and do a PIO flush regardless of the command type
if DRQ_STAT is asserted. See ide_dma_intr -> ide_error -> ...

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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...

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

    Wrote what? IORDY throttling does *apply* to both data and non-data 
register accesses, of course.

-ml

MBR, Sergei