linux-kernel - Re: [LIBATA BUG] sr.c: TEST_UNIT

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Date:	Tue, 13 Feb 2007 15:30:41 +0800
From:	"Conke Hu" <conke.hu@...il.com>
To:	conke.hu@....com
Cc:	"Jeff Garzik" <jeff@...zik.org>, Alan <alan@...rguk.ukuu.org.uk>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [LIBATA BUG] sr.c: TEST_UNIT_READY error

On 2/2/07, Conke Hu <conke.hu@....com> 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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