Re: [BUG] ide dma_timer_expiry, then hard lockup

Sergei Shtylyov
2007-06-19T14:23:09Z

Alan Cox wrote:

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

>>>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.

>> FIFO drain for DMA commands?

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

> 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 -> ...

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...

> Alan

MBR, Sergei