On 2/2/07, Conke Hu <[email protected]> wrote:
On Wed, 2007-02-07 at 07:40 -0500, Jeff Garzik wrote:
> Conke Hu wrote:
> > Hi,
> > TEST_UNIT_READY in get_capabilities (drivers/scsi/sr.c line 743, or
> > see below) always returns error.
> >
> > ---------------- code begin -----------------------------
> > retries = 0;
> > do {
> > memset((void *)cmd, 0, MAX_COMMAND_SIZE);
> > cmd[0] = TEST_UNIT_READY;
> >
> > the_result = scsi_execute_req (cd->device, cmd, DMA_NONE, NULL,
> > 0, &sshdr, SR_TIMEOUT,
> > MAX_RETRIES);
> >
> > retries++;
> > } while (retries < 5 &&
> > (!scsi_status_is_good(the_result) ||
> > (scsi_sense_valid(&sshdr) &&
> > sshdr.sense_key == UNIT_ATTENTION)));
> > ---------------- code end -----------------------------
> >
> > I debugged all kernel versions from 2.6.17 to 2.6.20 on several AMD
> > and other vendor's PATA/IDE controllers, and I get the_result==0x8000002
> > and retries==5; on silicon image 3132, i get the_result=0x2eb.
> > Does 0x8000002 mean ((DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION)?
> > what's wrong?
>
> What does the sense data returned in the sense buffer say is wrong?
>
> Jeff
I dump scsi_sense_hdr as follows:
sshdr.response_code = 0x70
sshdr.sense_key = 0x2
sshdr.asc = 0x3a
sshdr.ascq = 0x1
sshdr.additional_length = 0x0
the sense_key is 0x2 (NOT_READY), but the expected UNIT_ATTENTION :(
but "NOT" the expected UNIT_ATTENTION.
BTW, I am sorry for a mistake, Sil3132 also returns 0x8000002, not 0x2eb
as I said in the first mail. In a word, all cases return "the_result" as
0x8000002.
the bytes 0 ~ 13 in sense buffer are:
70 00 02 00 00 00 00 0a 00 00 00 00 3a
other bytes are all 0x00;
in fact this issue can be reproduced in any libata driver, either sata or pata.
Conke
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