Mark Lord wrote:
> Albert Lee wrote:
>
>> ..
>> Maybe we can wait a moment and give the slow ATAPI devices some time
>> to set DRQ.
>> Could you please try if the attached patch works, thanks.
>> --
>> albert
>>
>> --- linux-2.6.20.3/drivers/ata/libata-core.c 2007-03-15
>> 18:03:27.000000000 +0800
>> +++ linux-2.6.20.3-mod2/drivers/ata/libata-core.c 2007-03-17
>> 01:12:53.000000000 +0800
>> @@ -4384,6 +4384,19 @@ fsm_start:
>> */
>> poll_next = (qc->tf.flags & ATA_TFLAG_POLLING);
>>
>> + /* wait for some slow ATAPI devices to set DRQ */
>> + if (unlikely((status & ATA_DRQ) == 0) &&
>> + is_atapi_taskfile(&qc->tf)) {
>> + int max = 100;
>> +
>> + do {
>> + udelay(10);
>> + status = ata_chk_status(ap);
>> + max--;
>> + ata_port_printk(ap, KERN_ERR, "wait for DRQ %d\n",
>> 100-max);
>> + } while (((status & ATA_DRQ) == 0) && (max > 0));
>> + }
>> +
>> /* check device status */
>> if (unlikely((status & ATA_DRQ) == 0)) {
>> /* handle BSY=0, DRQ=0 as error */
>>
>
> I patched the above in, and it was NEVER hit.
Do you mean no "wait for DRQ" messages at all?
Is the HSM violation still seen?
--
albert
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