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

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Message-ID: <45C9C8BF.6030501@garzik.org>
Date:	Wed, 07 Feb 2007 07:40:31 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	conke.hu@....com
CC:	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

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



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