Re: hda: irq timeout: status=0xd0 DMA question

[Mark Lord <lkml@rtr.ca>]

Robert Hancock wrote:
> Henrik Persson wrote:
>> Does happen once or twice a year.. Probably something funky with the
>> cabling or some power-related issues.
>>
>> Anyway, I would be happy if the IDE driver would "just not do that". :)
> 
> I can see the reasoning where the device just doesn't function properly 
> with DMA at all (like on some Compact Flash-to-IDE adapters where the 
> card claims to support DMA but the DMA lines aren't wired through in the 
> adapter properly). In that case not disabling DMA would render it 
> useless. The IDE layer could keep track of whether DMA was previously 
> working on that device however, and not disable DMA on reset if it had 
> previously been working.

Definitely.  Where these things get sticky is in defining "DMA was working".
And keeping track of it separately for reads and writes.

cheers