John Clark wrote:
>> We can create a HORKAGE for it.  Can you please post the result of
>> "hdparm -I" of the device?
>>
>>   
> Tejun,
> 
> Here it is:
> 
> /dev/nst0:
> 
> ATAPI Sequential-access device, with removable media
>    Model Number:       QUANTUM DAT    DAT72-000

Can you please test the attached patch?

Alan, John Clark is reporting that the above tape drive chokes on odd
byte PIO transfer, so the default condition check (qc->nbytes & 15) in
atapi_check_dma() breaks the SATA tape drive, so there's always one
which breaks the other way around.  :-(

For the time being, I think the horkage should do.  I was wondering
whether you still think we should lift the default mod16 check in
atapi_check_dma().

Thanks.

-- 
tejun