Re: Initio 9100u -- Mike Christie's 2.6.0-test11 Patch -- Kernel Errors

[Mike Christie <mikenc@us.ibm.com>]

>>It then goes on to ID the drive correctly, and loads the sd driver, which
>>again IDs the drive correctly.. and we get:
>>
>>SCSI device  sda: 17783240 512-byte hdwr sectors (9105 MB)
>>SCSI device sda: drive cache: write back
>>/dev/scsi/host0/bus0/target1/lun0: unknown partition table
>>Attached scsi disk sda at scsi0, channel 0, id 1, lun 0
> 
> 
> This one's really strange, because clearly the INQUIRY and the
> READ_CAPACITY both succeeded and returned apparently good values.  The
> READ10 to the DOS parition sector has failed (with no errors).
> 
> The only difference is that the READ10 is generated in the partition
> code (via read_dev_sector), so it will be a sg read (probably with
> scsi_device->use_sg set to 1)...I'm travelling today, so if Mike hasn't
> found the problem by the tomorrow, I'll take a look.
> 

For use_sg == 1 the driver was doing this:

-		if (SCpnt->use_sg == 1) {	/* If only one entry in the list *//* 
treat it as regular I/O */
-			pSCB->SCB_BufPtr = (U32) VIRT_TO_BUS(pSrbSG->address);
-			TotalLen = pSrbSG->length;
-			pSCB->SCB_SGLen = 0;

but I had changed it to do sg io instead not knowing why it needed to 
treat it is as regular I/O. I will send a new patch in the next mail.

mike